Renesas ISL68137IRAZ Digital dual output, 7-phase configurable pwm controller with adaptive voltage scaling bus (avsbus) Datasheet

DATASHEET
ISL68137
Digital Dual Output, 7-Phase Configurable PWM Controller with Adaptive Voltage
Scaling Bus (AVSBus)
The ISL68137 is a digital dual output, flexible multiphase
(X+Y ≤ 7) PWM controller with Adaptive Voltage Scaling Bus
(AVSBus) interface. The ISL68137 can be configured to
support any desired phase assignments up to a maximum of
seven phases across the two outputs (X+Y). For example, 6+1,
5+2, 4+2, 3+3, 3+2, or even a single output as a 7+0
configuration are supported. The flexible phase arrangement,
combined with PMBus and AVSBus interfaces, allows the
device to support any demanding power supply requirement.
The ISL68137 with AVSBus complements PMBus by providing
a common interface that accelerates point-to-point
communication between the controller and the load to
statically and dynamically control the processor voltage, thus
delivering a balanced and power-efficient solution. AVSBus can
be used exclusively after the device is configured using PMBus.
The ISL68137 uses Intersil’s proprietary linear synthetic digital
current modulation scheme to achieve the industry’s best
combination of transient response and ease of tuning, while
addressing the challenges of modern multiphase designs.
Device configuration and telemetry monitoring is
accomplished using Intersil's intuitive PowerNavigator™ GUI.
The ISL68137 device supports on-chip nonvolatile memory to
store various configuration settings that are user selectable
through pin-strap, giving system designers increased power
density to configure and deploy multiple configurations. The
device supports an automatic phase add/drop feature to allow
maximum efficiency across all load ranges. Thresholds for
automatic phase add/drop are user programmable using the
powerful PowerNavigator GUI.
The ISL68137 supports a comprehensive fault management
system to enable the design of highly reliable systems. From a
multitiered overcurrent protection scheme, to the configurable
power-good and output overvoltage/undervoltage fault
thresholds and temperature monitoring, almost any need is
accommodated.
With minimal external components, easy configuration, robust
fault management, and highly accurate regulation capability,
implementing a high-performance multiphase regulator has
never been easier.
Applications
• Networking equipment
• Telecom and datacom equipment
• Server and storage equipment
• Point-of-load power supply (Memory, DSP, ASIC, FPGA)
FN8757 Rev.1.00
Jun 26, 2017
FN8757
Rev.1.00
Jun 26, 2017
Features
• PMBus 1.3 and AVSBus compliant
- Telemetry - VIN, VOUT, IOUT, power IN/OUT, temperature,
and various fault status registers
- Individual AVSBus interface enables high speed voltage
changes
• Advanced linear digital modulation scheme
- Zero latency synthetic current control for excellent HF
current balance
- Dual-edge modulation for fastest transient response
• Auto phase add/drop for excellent load vs efficiency profile
• Flexible phase configuration
- 7+0, 6+1, 5+2, 4+3 phase operation
- Operation using less than seven phases between two
outputs is also supported
• Diode braking for overshoot reduction
• Differential remote voltage sensing supports ±0.5% closed
loop system accuracy over load, line, and temperature
• Highly accurate current sensing for excellent load-line
regulation and accurate OCP
- Supports ISL99227 60A smart power stages
- Supports DCR sense with integrated temperature
compensation
• Supports phase doubler (ISL6617A) for up to 14-phase
operation
• Comprehensive fault management enables high reliability
systems
- Pulse-by-pulse phase current limiting
- Total output current protection
- Output and input OV/UV
- Open voltage sense detect
- Black box recording capability for faults
• Intuitive configuration using the PowerNavigator GUI
- NVM to store up to eight configurations
• Pb-free (RoHS compliant)
Related Literature
• For a full list of related documents, visit our website
- ISL68137 product page
Page 1 of 54
ISL68137
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Driver, DrMOS, and Smart Power Stage Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Internal Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Application: 6+1 Configuration with ISL99227 SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Application: 4+3 Configuration with ISL99227 SPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Application: 5+2 Configuration with DCR Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical Application: Phase Doubler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWM Modulation Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PMBus Address Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phase Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Phase Add and Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lossless Input Current and Power Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Soft-Start Delay and Ramp Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stored Configuration Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
13
13
13
13
13
14
14
14
15
16
16
17
17
17
17
17
Fault Monitoring and Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-Good Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Current Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Smart Power Stage OC Fault Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Monitoring and Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
18
18
18
20
20
Layout and Design Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PMBus Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PMBus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
PMBus Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
PMBus Use Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PMBus Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PMBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
OT_FAULT_LIMIT (4Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Adaptive Voltage Scaling (AVSBus) Functionality and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
AVSBus Master Send Subframe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
AVSBus Slave Response Subframe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
AVSBus Command Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
FN8757 Rev.1.00
Jun 26, 2017
Page 2 of 54
ISL68137
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL68137IRAZ
PART
MARKING
TEMP. RANGE
(°C)
ISL68137 IRZ
PACKAGE
(RoHS COMPLIANT)
-40 to +85
PKG.
DWG. #
48 Ld 6x6 QFN
L48.6x6B
NOTES:
1. Add “-T” suffix for 4k unit or “-T7A” suffix for 250 unit tape and reel options. Refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials and 100% matte tin
plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), see the product information page for ISL68137. For more information on MSL, see TB363.
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
PHASE CONFIGURATION
OUTPUT X/OUTPUT Y
SPECIFICATION SUPPORTED
PACKAGE
ISL68137
X+Y ≤ 7
PMBus/AVSBus
QFN 48 Ld, 6x6mm
ISL68134
X+Y ≤ 4
PMBus/AVSBus
TQFN 40 Ld, 5x5mm
ISL68127
X+Y ≤ 7
PMBus
QFN 48 Ld, 6x6mm
ISL68124
X+Y ≤ 4
PMBus
TQFN 40 Ld, 5x5mm
Pin Configuration
DNC
DNC
DNC
TMON1
TMON0
VCCS
VCC
SA
VSEN0
RGND0
CS0
CSRTN0
ISL68137
(48 LD QFN)
TOP VIEW
48
47
46
45
44
43
42
41
40
39
38
37
PWM0
1
36
CS1
PWM1
2
35
CSRTN1
PWM2
3
34 CS2
PWM3
4
33
CSRTN2
PWM4
5
32
CS3
PWM5
6
31 CSRTN3
GND
(EPAD)
PWM6
7
AVS_CLK
8
29 CSRTN4
AVS_SDA
9
28 CS5
30 CS4
AVS_MDA 10
27 CSRTN5
26 CS6
AVS_VDDIO 11
25 CSRTN6
FN8757 Rev.1.00
Jun 26, 2017
13
14
15
16
17
18
19
20
21
22
23
24
EN0
EN1
TWARN
PG0
PG1
SCL
SDA
SALRT
CONFIG
VINSEN
VSEN1
RGND1
DNC 12
Page 3 of 54
ISL68137
Functional Pin Descriptions
Refer to Table 4 on page 21 for design layout considerations.
PIN NUMBER
PIN NAME
7, 6, 5, 4, 3, 2, 1
PWM[6:0]
Pulse width modulation outputs. Connect these pins to the PWM input pins of 3.3V logic compatible Intersil
smart power stages, driver IC(s), or power stages.
8
AVS_CLK
AVSBus clock input pin. Connect to ground if not used.
9
AVS_SDA
AVSBus data output pin. Leave open if not used.
10
AVS_MDA
AVSBus data input pin. Connect to ground if not used.
11
AVS_VDDIO
12, 46, 47, 48
DNC
Do not connect any signals to these pins.
13
EN0
Input pin used for enable control of Output 0. Active high. Connect to ground if not used.
14
EN1
Input pin used for enable control of Output 1. Active high. Connect to ground if not used.
15
TWARN
16
PG0
Open-drain, power-good indicators for Output 0. Maximum pull-up voltage is VCC.
17
PG1
Open-drain, power-good indicators for Output 1. Maximum pull-up voltage is VCC.
18
SCL
Serial clock signal pin for SMBus interface. Maximum pull-up voltage is VCC.
19
SDA
Serial data signal pin for SMBus interface. Maximum pull-up voltage is VCC.
20
SALRT
Serial alert signal pin for SMBus interface. Maximum pull-up voltage is VCC.
21
CONFIG
Configuration ID selection pin. See Table 3 for more details.
22
VINSEN
Input voltage sense pin. Connect to VIN through a resistor divider (typically 40.2k/10k) with a 10nF decoupling
capacitor.
23
VSEN1
Positive differential voltage sense input for Output 1. Connect to positive remote sensing point. Connect to
ground if not used.
24
RGND1
Negative differential voltage sense input for Output 1. Connect to negative remote sensing point. Connect to
ground if not used.
25, 27, 29, 31,
33, 35, 37
CSRTN[6:0]
26, 28, 30, 32,
34, 36, 38
CS[6:0]
The CS and CSRTN pins are current sense inputs to individual phase differential amplifiers. Unused phases
should have their respective current sense inputs grounded. The ISL68137 supports smart power stage, DCR,
and resistor sensing. Connection details depend on current sense method chosen.
39
RGND0
Negative differential voltage sense input for Output 0. Connect to negative remote sensing point. Connect to
ground if not used.
40
VSEN0
Positive differential voltage sense input for Output 0. Connect to positive remote sensing point. Connect to
ground if not used.
41
SA
PMBus Address selection pin. See Table 2 on page 13 for more details.
42
VCC
Chip primary bias input. Connect this pin directly to a +3.3V supply with a high quality MLCC bypass capacitor.
43
VCCS
Internally generated 1.2V LDO logic supply from VCC. Decouple with 4.7µF or greater MLCC (X5R or better).
44
TMON0
Input pin for external temperature measurement at Output 0. Supports diode based temperature sensing as well
as smart power stage sensing. Refer to section “Temperature Compensation” on page 16 for more information.
45
TMON1
Input pin for external temperature measurement at Output 1. Supports diode based temperature sensing as well
as smart power stage sensing. Refer to section “Temperature Compensation” on page 16 for more information.
EPAD
GND
FN8757 Rev.1.00
Jun 26, 2017
DESCRIPTION
AVSBus reference voltage input pin. Leave open if not used.
Thermal warning flag. This open-drain output will be pulled low in the event of a sensed over-temperature at
TMON pins without disabling the regulators. Maximum pull-up voltage is VCC.
Package pad serves as GND return for all chip functions. Connect directly to system GND plane with multiple
thermal vias.
Page 4 of 54
ISL68137
Driver, DrMOS, and Smart Power Stage Recommendation
INTERSIL PART
NUMBER
QUIESCENT CURRENT
(mA)
GATE DRIVE
VOLTAGE (V)
NUMBER OF
DRIVERS
ISL99227
4.85
5
Single
60A, 5x5 smart power stage
ISL99140
0.19
5
Single
40A, 6x6 DrMOS
ISL6596
0.19
5
Single
Connect ISL6596 VCTRL to 3.3V
ISL6617A
5
N/A
N/A
COMMENTS
Phase doubler with 5V PWM output to be compatible with a 60A DrMOS or
with 60A smart power stage. Supports up to a 14-phase design.
Internal Block Diagram
CS0
CYCLECYCLE OCP
ADC
CSRTN0
CS1
CSRTN1
CS2
CSRTN2
CS3
CSRTN3
CS4
CSRTN4
CS5
CSRTN6
CS6
CSRTN6
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ADC
CYCLECYCLE OCP
ISUM-0
SUMMED
OCP
PG0
STATUS
MANAGER
PG1
TWARN
EN0
LOOP
MANAGER
EN1
CONFIG
CPU
SA
NVM
BLACKBO X
RGND0
ADC
VSA
SUMMED
OCP
OV
CURRENT
AC FB
VDROOP
VSE N1
RGND1
VSA
ADC
UV
+
+
PID
OV
VINSEN
UV
+
+
TMO N0
TMO N1
ADC
VCC
PWM0
DIG ITAL DUAL
EDGE
MODULATOR
PID
DIG ITAL DUAL
EDGE
MODULATOR
PMBus
INTERFACE
PWM3
PWM4
PWM5
SCL
SDA
SALRT
AVS_CLK
AVSBus
INTERFACE
VCCS
PWM2
PWM6
FAULT AND
TELEMETRY
MANAGER
LDO
PWM1
PHASE MANAGER
VSE N0
ISUM-1
CURRENT
AC FB
VDROOP
AVS_MDA
AVS_SDA
AVS_VDDIO
FIGURE 1. INTERNAL BLOCK DIAGRAM
FN8757 Rev.1.00
Jun 26, 2017
Page 5 of 54
ISL68137
Typical Application: 6+1 Configuration with ISL99227 SPS
RGND0
VSEN0
1k
EN0
VCCS
PG0
4.7µF
100
TMON0
3.3V
ISL99227
VCC
4.7µF
TMON
PWM
470pF
PWM0
CS0
CSRTN0
100
0.1µF
470pF
IMON
REFIN
5V
VIN
BOOT
0.1µF
2x22µF
12V
PHASE
FAULT#
12V
GND SW
ISL99227
40.2k
TMON
VINSEN
PWM1
10k
PVCC
VCC
0.01µF
100
CS1
CSRTN1
PWM
0.1µF
470pF
IMON
REFIN
PVCC
VCC
COUT
VIN
BOOT
VOUT0
5V
12V
0.1µF
2x22µF
PHASE
FAULT#
ISL68137
GND SW
ISL99227
TMON
PWM2
CS2
CSRTN2
PWM
100
0.1µF
470pF
REFIN
5V
VIN
BOOT
0.1µF
2x22µF
12V
PHASE
AVS_CLK
FAULT#
AVS_SDA
GND SW
ISL99227
AVS_MDA
AVS_VDDIO
IMON
PVCC
VCC
TMON
PWM3
CS3
CSRTN3
PWM
100
0.1µF
470pF
IMON
REFIN
PVCC
VCC
5V
VIN
BOOT
0.1µF
2x22µF
12V
PHASE
FAULT#
GND SW
ISL99227
TMON
PWM4
CS4
TWARN
CSRTN4
PWM
100
0.1µF
470pF
VIN
BOOT
12V
0.1µF
2x22µF
VOUT1
FAULT#
COUT
GND SW
ISL99227
SDA
SA
REFIN
5V
PHASE
SCL
SALRT
IMON
PVCC
VCC
PWM5
CS5
CSRTN5
TMON
PWM
100
0.1µF
470pF
IMON
REFIN
TMON1
PWM6
CS6
CSRTN6
5V
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
CONFIG
PVCC
VCC
GND SW
ISL99227
TMON
PWM
470pF
100
470pF
IMON
0.1µF
REFIN
PVCC
VCC
5V
VIN
BOOT
0.1µF
2x22µF
12V
PHASE
FAULT#
GND SW
PG1
1k
EN1
RGND1
VSEN1
FIGURE 2. TYPICAL APPLICATION: 6+1 CONFIGURATION WITH ISL99227 SPS
FN8757 Rev.1.00
Jun 26, 2017
Page 6 of 54
ISL68137
Typical Application: 4+3 Configuration with ISL99227 SPS
RGND0
VSEN0
1k
EN0
VCCS
PG0
4.7µF
100
TMON0
ISL99227
VCC
3.3V
4.7µF
PWM0
CS0
CSRTN0
TMON
PWM
470pF
100
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
VIN
BOOT
0.1µF
2x22µF
12V
PHASE
FAULT#
12V
GND SW
ISL99227
40.2k
TMON
VINSEN
PWM1
10k
0.01µF
CS1
CSRTN1
PWM
100
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
ISL68137
GND
SW
ISL99227
TMON
PWM2
CS2
PWM
100
0.1µF
CSRTN2
IMON
REFIN
470pF
12V
VIN
BOOT
VOUT0
COUT
0.1µF
2x22µF
PHASE
AVS_CLK
FAULT#
AVS_SDA
GND
SW
ISL99227
AVS_MDA
AVS_VDDIO
5V
PVCC
VCC
TMON
PWM3
100
CS3
CSRTN3
PWM
0.1µF
470pF
IMON
REFIN
5V
PVCC
VCC
VIN
BOOT
0.1µF
2x22µF
12V
PHASE
FAULT#
GND
SW
ISL99227
TMON
PWM4
CS4
TWARN
CSRTN4
PWM
100
0.1µF
470pF
0.1µF
2x22µF
12V
GND
SW
ISL99227
SDA
SA
VIN
BOOT
PHASE
FAULT#
SCL
SALRT
IMON
REFIN
5V
PVCC
VCC
PWM5
CS5
CSRTN5
TMON
PWM
100
0.1µF
470pF
IMON
REFIN
TMON1
CSRTN6
0.1µF
2x22µF
GND
SW
ISL99227
CONFIG
CS6
12V
VIN
BOOT
VOUT1
COUT
PHASE
FAULT#
PWM6
5V
PVCC
VCC
TMON
PWM
470pF
100
470pF
IMON
0.1µF
REFIN
5V
PVCC
VCC
12V
VIN
BOOT
0.1µF
2x22µF
PHASE
FAULT#
GND
SW
PG1
1k
EN1
RGND1
VSEN1
FIGURE 3. TYPICAL APPLICATION: 4+3 CONFIGURATION WITH ISL99227 SPS
FN8757 Rev.1.00
Jun 26, 2017
Page 7 of 54
ISL68137
Typical Application: 5+2 Configuration with DCR Sensing
RGND0
VSEN0
1k
EN0
VCCS
PG0
0.1µF
PWM0
EN
THDN
BOOT
PHASE
PWM
VCC
3.3V
PVCC
VCC
ISL99140
GND
5V
VIN
2x22µF
12V
SW
CS0
4.7µF
CSRTN0
TMON0
12V
40.2k
0.1µF
VINSEN
10k
PWM1
0.01µF
EN
THDN
BOOT
PHASE
PWM
PVCC
VCC
ISL99140
GND
5V
VIN
2x22µF
12V
VOUT0
COUT
SW
CS1
CSRTN1
ISL68137
0.1µF
PWM2
EN
THDN
BOOT
PHASE
PWM
PVCC
VCC
ISL99140
GND
5V
VIN
2x22µF
12V
SW
CS2
CSRTN2
AVS_SDA
AVS_MDA
AVS_VDDIO
0.1µF
PWM3
EN
THDN
BOOT
PHASE
PWM
5V
PVCC
VCC
AVS_CLK
ISL99140
GND
VIN
12V
2x22µF
SW
CS3
CSRTN3
0.1µF
TWARN
PWM4
EN
THDN
BOOT
PHASE
PWM
5V
PVCC
VCC
ISL99140
GND
VIN
12V
2x22µF
SW
CS4
SCL
COUT
CSRTN4
SDA
SALRT
0.1µF
SA
PWM5
EN
THDN
BOOT
PHASE
PWM
5V
PVCC
VCC
ISL99140
GND
VOUT1
VIN
12V
2x22µF
SW
CS5
CSRTN5
CONFIG
0.1µF
PWM6
EN
THDN
BOOT
PHASE
PWM
5V
PVCC
VCC
ISL99140
GND
VIN
12V
2x22µF
SW
CS6
CSRTN6
PG1
1k
EN1
TMON1
RGND1
VSEN1
FIGURE 4. TYPICAL APPLICATION: 5+2 CONFIGURATION WITH DCR SENSING
FN8757 Rev.1.00
Jun 26, 2017
Page 8 of 54
ISL68137
Typical Application: Phase Doubler
VCCS
4.7µF
RGND0
EN0
PG0
100
VSEN 0
ISL99227B
TMON0
PWM
IMON
VCC
3.3V
PVCC
VCC
LGCTRL
4.7µF
CSRTN0
470pF
TMON
ISL6617A
5V
0.1µF
PWMIN
IOUT
BOOT
12V
0.1µF
2x22µF
PHASE
SW
GND
0.1µF
CSRTNA
EN_SYNC
PWM0
40.2k
FAULT#
PWMA
CSENA
VCC
12V
VIN
REFIN
CS0
5V
GND
ISL99227B
PWMB
CSENB
PWM
CSRTNB
PVCC
VCC
LGCTRL
IMON
VINSEN
VIN
REFIN
10k
TMON
FAULT#
0.01µF
5V
BOOT
12V
0.1µF
2x22µF
PHASE
SW
GND
0.1µF
ISL99227B
PWM
PVCC
VCC
LGCTRL
VIN
IMON
REFIN
CS1
CSRTN1
470pF
TMON
ISL6617A
5V
0.1µF
EN_SYNC
PWMIN
IOUT
BOOT
12V
0.1µF
2x22µF
PHASE
GND
SW
0.1µF
CSRTNA
VCC
PWM1
FAULT#
PWMA
CSENA
5V
GND
ISL99227B
PWMB
CSENB
PWM
CSRTNB
PVCC
VCC
LGCTRL
IMON
REFIN
TMON
FAULT#
5V
VIN
BOOT
12V
0.1µF
2x22µF
PHASE
GND
SW
0.1µF
CS2
CSRTN2
PWM2
CS3
CSRTN3
PWM3
ISL68137
CS4
CSRTN4
PWM4
ISL99227B
PWM
TWARN
REFIN
CSRTN5
470pF
AVS_SDA
AVS_MDA
AVS_VDDIO
TMON
ISL6617A
5V
0.1µF
EN_SYNC
PWMIN
IOUT
BOOT
12V
0.1µF
2x22µF
PHASE
GND
SW
0.1µF
CSRTNA
VCC
PWM5
FAULT#
PWMA
CSENA
5V
VIN
IMON
CS5
AVS_CLK
PVCC
VCC
LGCTRL
GND
ISL99227B
PWMB
CSENB
PWM
CSRTNB
PVCC
VCC
LGCTRL
VIN
IMON
REFIN
TMON
FAULT#
5V
BOOT
12V
0.1µF
2x22µF
VOUT 1
COUT
PHASE
GND
SW
0.1µF
SCL
ISL99227B
SDA
PWM
SALRT
SA
REFIN
470pF
FAULT#
PWMA
CSENA
0.1µF
EN_SYNC
PWMIN
IOUT
12V
0.1µF
2x22µF
PHASE
GND
SW
0.1µF
GND
ISL99227B
PWMB
CSENB
PWM
CSRTNB
PVCC
VCC
LGCTRL
IMON
REFIN
TMON
TMON1
470pF
PG1
BOOT
CSRTNA
VCC
PWM6
TMON
ISL6617A
5V
5V
VIN
IMON
CS6
CSRTN6
CONFIG
PVCC
VCC
LGCTRL
FAULT#
5V
VIN
BOOT
12V
0.1µF
2x22µF
PHASE
GND
SW
0.1µF
1k
EN1
RGND1
VSEN 1
FIGURE 5. TYPICAL APPLICATION: PHASE DOUBLER
FN8757 Rev.1.00
Jun 26, 2017
Page 9 of 54
ISL68137
Absolute Maximum Ratings
Thermal Information
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.3V
VCCS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.6V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . (GND - 0.3V) to VCC + 0.3V
ESD Rating:
Human Body Model (Tested per JS-001-2014) . . . . . . . . . . . . . . . . . . 2kV
Charged Device Model (Tested per JS-002-2014) . . . . . . . . . . . . . . . 1kV
Latch-Up (Tested per JESD-78E; Class 2, Level A). . . . . . . . . . . . . . . 100mA
Thermal Resistance (Notes 4, 5)
JA (°C/W) JC (°C/W)
48 Ld 6x6 QFN Package . . . . . . . . . . . . . . .
27
1
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.3V ±5%
Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 3.05V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured in free air with the component mounted on a high-effective thermal conductivity test board with “direct attach” features. See TB379.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Recommended operating conditions, VCC = 3.3V, unless otherwise specified. Boldface limits apply across the
operating temperature range -40°C to +85°C.
PARAMETER
TEST CONDITIONS
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
VCC SUPPLY CURRENT
Nominal Supply Current
VCC = 3.3VDC; EN1/2 = VIH, fSW = 400kHz
90.5
mA
Shutdown Supply Current
VCC = 3.3VDC; EN1/2 = 0V, no switching
11.4
mA
VCCS LDO SUPPLY
Output Voltage
Maximum Current Capability
1.20
Excluding internal load
1.25
1.30
50
V
mA
POWER-ON RESET AND INPUT VOLTAGE LOCKOUT
VCC Rising POR Threshold
2.7
2.9
V
VCC Falling POR Threshold
1.0
V
Enable (EN0 and EN1) Input High Level
2.55
V
Enable (EN0 and EN1) Input Low Level
0.8
Enable (EN0 and EN1) LOW to HIGH Ramp Delay
(TON_DELAY)
200
POR to Initialization Complete Time
V
µs
30
40
ms
0.25
3.05
V
Set-point 0.8V to 3.05V
-0.5
0.5
%
Set-point 0.25V to <0.8V
-5
5
mV
OUTPUT VOLTAGE CHARACTERISTICS (Note 6)
Output Voltage Adjustment Range
Output Voltage Set-Point Accuracy
VOLTAGE SENSE AMPLIFIER
Open Sense Current
Only during open pin check of initialization
22
µA
Input Impedance (VSEN - RGND)
200
kΩ
Maximum Common-Mode Input
VCC - 0.2
V
Maximum Differential Input (VSEN - RGND)
3.05
V
CURRENT SENSE AND OVERCURRENT PROTECTION
Maximum Common-Mode Input (SPS mode)
CSRTNx - GND
1.6
V
Maximum Common-Mode Input (DCR mode)
CSRTNx - GND
3.3
V
FN8757 Rev.1.00
Jun 26, 2017
Page 10 of 54
ISL68137
Electrical Specifications
Recommended operating conditions, VCC = 3.3V, unless otherwise specified. Boldface limits apply across the
operating temperature range -40°C to +85°C. (Continued)
PARAMETER
Current Sense Accuracy
TEST CONDITIONS
ISEN to ADC accuracy
MIN
(Note 7)
TYP
-2
MAX
(Note 7)
UNIT
2
%
Average Overcurrent Threshold Resolution
0.1
A
Cycle-by-Cycle Current Limiting Threshold Accuracy
0.1
A
0.01
mV/A
DIGITAL DROOP
Droop Resolution
OSCILLATORS
Accuracy of Switching Frequency Setting
When set to 500kHz
480
500
520
kHz
Accuracy of Switching Frequency Setting
-4
4
%
Switching Frequency Range
0.2
1.0
MHz
SOFT-START RATE AND VOLTAGE TRANSITION RATE
Minimum Soft-Start Ramp Rate
Programmable minimum rate
20
µs
Maximum Soft-Start Ramp Rate
Programmable maximum rate
10
ms
Soft-Start Ramp Rate Accuracy
-4
4
%
Minimum Transition Rate
Programmable minimum rate
0.1
mV/µs
Maximum Transition Rate
Programmable maximum rate
100
mV/µs
Transition Rate Accuracy
-4
4
%
PWM OUTPUT
PWMx Output High Level
IOUT = 4mA
PWMx Output Low Level
IOUT = 4mA
PWMx Output Tri-State IOL
VOH = VCC
PWMx Output Tri-State IOH
VOL = 0V
VCC - 0.4
V
0.4
V
1
µA
-1
µA
THERMAL MONITORING AND PROTECTION
Temperature Sensor Range
Temperature Sensor Accuracy
TMON to ADC accuracy
TWARN Output Low Impedance
-50
150
°C
-4.5
4.5
%
13
Ω
4
TWARN Hysteresis
9
3
°C
POWER-GOOD AND PROTECTION MONITORS
PG Output Low Voltage
IOUT = 8mA load
PG Leakage Current
With pull-up resistor externally connected to VCC
0.5
0.4
V
1.0
µA
Overvoltage Protection Threshold Resolution
1
mV
Undervoltage Protection Threshold Resolution
1
mV
VCC - 0.2
V
Overvoltage Protection Threshold when Disabled
INPUT VOLTAGE SENSE
Input Voltage Accuracy
VINSEN to ADC accuracy
-2.5
Input Voltage Protection Threshold Resolution
2.5
1
%
mV
AVSBus
AVSBus VDDIO Input Voltage Range
0.90
AVSBus CLK, MDA, Input High Level
0.6 * VDDIO
FN8757 Rev.1.00
Jun 26, 2017
3.63
V
V
Page 11 of 54
ISL68137
Electrical Specifications
Recommended operating conditions, VCC = 3.3V, unless otherwise specified. Boldface limits apply across the
operating temperature range -40°C to +85°C. (Continued)
PARAMETER
MIN
(Note 7)
TEST CONDITIONS
TYP
AVSBus CLK, MDA, Input Low Level
AVSBus SDA, Output High Level
MAX
(Note 7)
UNIT
0.4 * VDDIO
V
0.8 * VDDIO
V
AVSBus SDA, Output Low Level
0.2 * VDDIO
AVSBus CLK Maximum Frequency
50
V
MHz
AVSBus CLK Minimum Frequency
5
MHz
0.4
V
SMBus/PMBus
SALERT, SDA Output Low Level
IOUT = 4mA
SCL, SDA Input High Level
1.55
V
SCL, SDA Input Low Level
0.8
SCL, SDA Input Hysteresis
V
2
SCL Maximum Frequency
mV
0.05
2.00
MHz
NOTES:
6. These parts are designed and adjusted for accuracy with all errors in the voltage loop included.
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization, and/or design.
Typical Performance Curves
0.100
0.05
0.095
0.090
0.04
0.080
ICC (A)
ICC (A)
0.085
0.075
0.070
0.03
0.02
0.065
0.01
0.060
0.055
0
0.050
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE (oC)
FIGURE 6. NOMINAL SUPPLY CURRENT vs TEMPERATURE
FN8757 Rev.1.00
Jun 26, 2017
100
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE (oC)
FIGURE 7. SHUTDOWN SUPPLY CURRENT vs TEMPERATURE
Page 12 of 54
100
ISL68137
Functional Description
The ISL68137 is a digital dual output 7-phase PWM controller
that can be programmed for single output 7+0, dual output 6+1,
5+2, or 4+3 phase operation. Operation using less than seven
phases between two outputs is also supported. Existing digital
multiphase solutions use analog comparator based schemes
(nonlinear) to bolster the inadequate transient response
common to many digital multiphase solutions. The ISL68137
uses a linear voltage regulation scheme to address transient
loads. As a result, it is much easier for users to configure and
validate their designs when compared with nonlinear schemes.
By combining a proprietary low noise and zero latency digital
current sense scheme with cutting edge digital design
techniques, Intersil is able to meet transient demands without
resorting to nonlinear schemes. In addition, the ISL68137 can
store up to eight user configurations in NVM and allows the user
to select the desired configuration through pin-strap (CONFIG).
The result is a system that is easy to configure and deploy.
The ISL68137 supports several performance enhancing features.
These include AVSBus control, diode braking, automatic phase
dropping, DCR/resistor/smart power stage current sense
support, load line regulation, and multiple temperature sensing
options.
To facilitate configuration development, the PowerNavigator GUI
provides a step-by-step arrangement for setup and parametric
adjustment. After a configuration has been set, the user can
employ PowerNavigator to monitor telemetry or use the PMBus
interface directly based on the supported command set.
PWM Modulation Scheme
The ISL68137 uses Intersil's proprietary linear synthetic current
modulation scheme to improve transient performance. This is a
unique constant frequency, dual edge PWM modulation scheme
with both PWM leading and trailing edges being independently
moved to give the best response to transient loads. Current
balance is an inherent part of the regulation scheme. The
modulation scheme is capable of overlapping pulses if the load
profile demands such operation. In addition, the modulator is
capable of adding or removing pulses from a given cycle in
response to regulation demands while still managing maximum
average frequency to safe levels. For DC load conditions the
operating frequency is constant.
PMBus Address Selection
When communicating with multiple PMBus devices on a single
bus, each device must have its own unique address so the host
can distinguish between the devices. The device address can be
set using a 1% resistor on the SA pin according to the pin-strap
options listed in Table 2.
R SA
(Ω)
PMBus
ADDRESS
R SA
(Ω)
PMBus
ADDRESS
0
60h
1500
50h
180
61h
1800
51h
330
64h
2200
54h
470
65h
2700
55h
680
40h
3300
58h
820
41h
3900
59h
1000
44h
4700
5Ch
1200
45h
5600
5Dh
Phase Configuration
The ISL68137 supports up to two regulated outputs through
seven configurable phases. Either output is capable of controlling
up to seven phases in any arbitrary mix. Phase assignments are
accomplished through the PowerNavigator GUI.
Although the device supports arbitrary phase assignment, it is
good practice to assign phases to Output 1 in descending
sequential numerical order starting from Phase 6. For example, a
4-phase rail could consist of phases 6, 5, 4, and 3. For Output 0,
phases would be assigned starting from Phase 0 in ascending
sequential numerical order.
Automatic Phase Add and Drop
To produce the most optimal efficiency across a wide range of
output loading, the modulator supports automatic dropping or
adding of phases. Use of automatic phase dropping is optional. If
automatic phase dropping is enabled, the number of active
phases at any time is determined solely by load current. During
operation, phases of Output 1 will drop beginning with the lowest
phase number assigned. Phase dropping begins with the highest
assigned phase number. Figure 8 illustrates the typical
characteristic of efficiency vs load current vs phase count.
I2
I3
I4
I5
I1
EFFICIENCY (%)
Overview
TABLE 2. RESISTOR VALUES TO ADDRESS MAPPING
0
20
40
60
80
100
120
140
160
LOAD (A)
FIGURE 8. EFFICIENCY vs PHASE NUMBER
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180
ISL68137
Phases are dropped one at a time with a user programmed drop
delay between drop events. As an example, suppose the delay is
set to 1ms and three phases are active. If the load suddenly
drops to a level needing only one phase, the ISL68137 will begin
by dropping a phase after 1ms. An additional phase will be
dropped each 1ms thereafter until only one phase remains.
In addition to the described load current add/drop thresholds,
the fast phase add function provides a very rapid response to
transient load conditions. This feature continuously monitors the
system regulation error and if it exceeds the user set threshold,
all dropped phases will be readied for use. In this way, there is no
delay if all phases are needed to support a load transient. The
fast phase add threshold is set in the PowerNavigator GUI. The
output current threshold for adding and dropping phases can
also be configured.
To ensure dropped phases have sufficient boot capacitor charge
to turn on the high-side MOSFET after a long period of disable, a
boot refresh circuit turns on the low-side MOSFET of each
dropped phase to refresh the boot capacitor. The frequency of
the boot refresh is programmable using PowerNavigator.
INDUCTOR DCR SENSING
DCR sensing takes advantage of the fact that an inductor
winding has a resistive component (DCR) that will drop a voltage
proportional to the inductor current. Figure 9 shows that the DCR
is treated as a lumped element with one terminal inaccessible
for measurement. Fortunately, a simple R-C network as shown in
Figure 10 is capable of reproducing the hidden DCR voltage. By
simply matching the R-C time constant to the L/DCR time
constant, it is possible to precisely recreate the DCR voltage
across the capacitor. This means that VDCR(t) = VC(t), thus
preserving even the high frequency characteristic of the DCR
voltage.
L
VOUT
VPHASE
R
L
 R C
DCR
IC
CSRTNn
Output Voltage Configuration
Output voltage set points and thresholds for each output can be
configured with the PowerNavigator GUI. Parameters such as
output voltage, VOUT margin high/low, and VOUT OV/UV fault
thresholds can be configured with the GUI. Additionally, output
voltage and margin high/low can be adjusted during regulation
using PMBus command VOUT_COMMAND, VOUT_MARGIN_HIGH,
and VOUT_MARGIN_LOW for further tuning. The following VOUT
relationships must be maintained for correct operation:
VOUT_OV_FAULT_LIMIT > VOUT_COMMAND
(VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW, if used) >
VOUT_UV_FAULT_LIMIT. Additionally, the VOUT commands are
bounded by VOUT_MAX and VOUT_MIN to provide protection
against incorrect set points being sent to the device. The
ISL68137 also incorporates AVSBus functionality for high speed
changes to the VOUT target.
Switching Frequency
The switching frequency is user configurable over a range of
200kHz to 1MHz.
Current Sensing
The ISL68137 supports DCR, resistor, and smart power stage
current sensing. Connection to the various sense elements is
accomplished through the CS and CSRTN pins. Current sensing
inputs are high impedance differential inputs to reject noise and
ground related inaccuracies.
To accommodate a wide range of effective sense resistance,
information about the effective sense resistance and required
per phase current capability is used by the GUI to properly
configure the current sense circuitry.
FN8757 Rev.1.00
Jun 26, 2017
DCR
CURRENT
SENSE
C
CSn
FIGURE 9. DCR SENSING CONFIGURATION
Modern inductors often have such low DCR values that the
resulting signal is <10mV. To avoid noise problems, care must be
taken in the PCB layout to properly place the R-C components and
route the differential lines between controller and inductor.
Figure 9 shows one PCB design method that places the R
component near the inductor VPHASE and the C component very
close to the IC pins. This minimizes routing of the noisy VPHASE
and maximizes filtering near the IC. Route the lines between the
inductor and IC as a pair on a single layer directly to the controller.
Care must be taken to avoid routing the pair near any switching
signals including Phase, PWM etc. This is the method used by
Intersil on evaluation board designs.
This method is sensing the resistance of a metal winding in
which the DCR value will increase with temperature. This must be
compensated or the sensed (and reported) current will increase
with temperature. To compensate the temperature effect, the
ISL68137 provides temperature sensing options and an internal
methodology to apply the correction.
RESISTIVE SENSING
For more accurate current sensing, a dedicated current sense
resistor RSENSE in series with each output inductor can serve as
the current sense element. This technique, however, reduces the
overall converter efficiency due to the additional power loss on
the current sense element RSENSE.
Page 14 of 54
ISL68137
IOUT
RSENSE ESL
VOUT
VPHASE
R
VOUT
ESL
 RC
RSENSE
IC
CSRTNn
C
CSn
FIGURE 12. DESIRED LOAD TRANSIENT RESPONSE WAVEFORMS
CURRENT
SENSE
I O UT
FIGURE 10. SENSE RESISTOR IN SERIES WITH INDUCTOR
A current sensing resistor has a distributed parasitic inductance,
known as Equivalent Series Inductance (ESL), typically less than
4nH. Consider the ESL as a separate lumped quantity, as shown
in Figure 10. The phase current IL, flowing through the inductor,
will also pass through the ESL. Similar to DCR sensing described
previously, a simple R-C network across the current sense
resistor extracts the RSENSE voltage. Simply match the
ESL/RSENSE time constant to the R-C time constant.
V O UT
FIGURE 13. LOAD TRANSIENT RESPONSE WHEN R-C TIME
CONSTANT IS TOO SMALL
IOUT
Figure 11 shows the sensed waveforms with and without
matching RC when using resistive sense. PCB layout should be
treated similar to that described for DCR sense.
MATCHED RC
VOUT
FIGURE 14. LOAD TRANSIENT RESPONSE WHEN R-C TIME
CONSTANT IS TOO LARGE
SPS CURRENT SENSING
MISMATCHED RC
FIGURE 11. VOLTAGE ACROSS R WITH AND WITHOUT RC
L/DCR OR ESL/RSEN MATCHING
Assuming the compensator design is correct, Figure 12 shows the
expected load transient response waveforms if L/DCR or
ESL/RSEN is matching the R-C time constant. When the load
current IOUT has a square change, the output voltage VOUT also
has a square response, except for the potential overshoot at load
release. However, there is always some uncertainty in the true
parameter values involved in the time constant matching and
therefore, fine-tuning is generally required.
If the R-C time constant is too large or too small, VC(t) will not
accurately represent real-time IOUT(t) and will worsen the
transient response. Figure 13 shows the load transient response
when the R-C timing constant is too small. In this condition, VOUT
will sag excessively upon load insertion and may create a system
failure or early overcurrent trip. Figure 14 shows the transient
response when the R-C timing constant is too large. VOUT is
sluggish in drooping to its final value. Use these general guides if
fine-tuning is needed.
SPS current sense is accomplished by sensing each SPS IMON
output individually using VCCS as a common reference. Connect
all SPS IREF input pins and all ISL68137 CSRTNn input pins
together and tie them to VCCS, then connect the SPS IMONn
output pins to the corresponding ISL68137 CSn input pins. The
signals should be run as differential pairs from the SPS back to
the ISL68137.
Temperature Sensing
The ISL68137 supports temperature sensing through BJT or
smart power stage sense elements. Support for BJT sense
elements uses the well known delta Vbe method and allows up
to two sensors (MMBT3906 or similar) on each temperature
sense input, TMON0 and TMON1. Support for smart power stage
uses a linear conversion algorithm and allows one sensor reading
per pin. The conversion from voltage to temperature for smart
power stage sensing is user programmable using the
PowerNavigator GUI.
SPS temperature sensing measures the temperature dependent
voltage output on the SPS TMON pin. All of the SPS devices
attached to the Output 0 rail have their TMON pins connected to
the ISL68137 TMON0 pin. All of the SPS devices attached to the
Output 1 rail have their TMON pins connected to the ISL68137
TMON1 pin. The reported temperature is that of the highest
temperature SPS of the group.
In addition to the external temperature sense, the IC senses its own
die temperature, which can be monitored using PowerNavigator.
FN8757 Rev.1.00
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Page 15 of 54
ISL68137
Sensed temperature is used in the system for faults, telemetry
and temperature compensation of sensed current.
Temperature Compensation
Thus, the temperature-compensated DCR is now used to
determine the actual value of current in the DCR sense element.
IPHASE#
DCR
The ISL68137 supports inductor DCR sensing, which generally
requires temperature compensation due to the copper wire used
to form inductors. Copper has a positive temperature coefficient
of approximately 0.39%/°C. Because the voltage across the
inductor is sensed for the output current information, the sensed
current has the same positive temperature coefficient as the
inductor DCR.
Compensating current sense for temperature variation generally
requires that the current sensing element temperature and its
temperature coefficient is known. Although temperature
coefficient is generally obtained easily, the actual current sense
element temperature is essentially impossible to measure
directly. Instead, a temperature sensor (a BJT for the ISL68137)
placed near the inductors is measured and the current sense
element (DCR) temperature is calculated from that
measurement. Calculating current sense element temperature is
equivalent to applying gain and offset corrections to the
temperature sensor measurement and the ISL68137 supports
both corrections.
Figure 15 depicts the block diagram of temperature
compensation. A BJT placed near the inductors used for DCR
sensing is monitored by the IC using the well known delta Vbe
method of temperature sensing. TSENSE is the direct measured
temperature of the BJT. Because the BJT is not directly sensing
DCR, corrections must be made so that TDCR reflects the true
DCR temperature. Corrections are applied according to the
relationship shown in Equation 1, where kSLOPE represents a
gain scaling and TOFFSET represents an offset correction. These
parameters are provided by the designer using the
PowerNavigator GUI:
T DCR = k SLOPE  T SENSE + T OFFSET
(EQ. 1)
After TDCR has been determined, the compensated DCR value
can be determined according to Equation 2, where DCR25 is the
DCR at +25°C and TC is the temperature coefficient of copper
(3900 ppm/°C). TDCR = TACTUAL here:
DCR CORR = DCR 25   1 + T C   T ACTUAL – 25  
(EQ. 2)
VOUT
CSRTNx
TEMPERATURE
COMPENSATION
DCRCORR
CURRENT
SENSE
CSx
IPHASE#
kSLOPE
TOFFSET
TO TELEMETRY
TC
TMONx
Vbe
VCCS
IC
TSENSE
FIGURE 15. BLOCK DIAGRAM OF TEMPERATURE COMPENSATION
In the physical PCB design, the temperature sense diode (BJT) is
placed close to the inductor of the phase that is never dropped
during automatic phase drop operation. Additionally, a filter
capacitor no larger than 500pF should be added near the IC
between each TMON pin and VCCS. This is shown in Figure 16.
IC
TMON1
OPTIONAL AUXILIARY
TEMPERATURE SENSE
VCCS
TMON0
OPTIONAL AUXILIARY
TEMPERATURE SENSE
SW1
SW5
SW6
SW0
L1
L5
L6
L0
OUT1
OUT0
FIGURE 16. RECOMMENDED PLACEMENT OF BJT
Lossless Input Current and Power Sensing
Input current telemetry is provided using an input current
synthesizer. By using the IC’s ability to precisely determine its
operational conditions, input current can be synthesized to a high
degree of accuracy without the need for a lossy sense resistor.
Fine-tuning of offset and gain are provided for in the GUI. Note
that input current sense fine-tuning must be done after output
current sense setup is finalized. With a precise knowledge of
input current and voltage, input power can be computed.
Input current and power telemetry is accessed using PMBus and
easily monitored in the PowerNavigator GUI. VIN is monitored
directly by the VINSEN pin through a 1:5 resistor divider as shown
in Figure 17.
FN8757 Rev.1.00
Jun 26, 2017
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ISL68137
VIN
IC
40.2k
VINSEN
ADC
10nF
10k
FIGURE 17. INPUT VOLTAGE SENSE CONFIGURATION
Voltage Regulation
Output voltage is sensed through the remote sense differential
amplifier and digitized. From this point, the regulation loop is
entirely digital. Traditional PID controls are used in conjunction
with several enhanced methods to compensate the voltage
regulation loop and tune the transient response.
Current Feedback
Current feedback in a voltage regulator is often used to ease the
stability design of the voltage feedback path. Additionally, many
microprocessors require the voltage regulator to have a
controlled output resistance (known as load-line or droop
regulation) and this is accomplished using current feedback.
For applications requiring droop regulation, the designer simply
specifies the output resistance desired using the PowerNavigator
GUI.
Current feedback stability benefits are available for rails that do
not specify droop regulation such as system agent. For these
applications, the designer can enable AC current feedback in the
GUI. With this configuration, the DC output voltage will be steady
regardless of load current.
Power-On Reset (POR)
Initialization of the ISL68137 begins after VCC crosses its rising
POR threshold. When POR conditions are met, the internal 1.2V
LDO is enabled and basic digital subsystem integrity checks
begin. During this process, the controller will load the selected
user configuration from NVM as indicated by the CONFIG pin
resistor value, read VIN UVLO thresholds from memory and start
the telemetry subsystem. With telemetry enabled, VIN can be
monitored to determine when it exceeds its user programmable
rising UVLO threshold. When VCC and VIN satisfy their respective
voltage conditions, the controller is in its shutdown state. It will
transition to its active state and begin soft-start when the state of
EN0/EN1 command a start-up. While in shutdown mode, the
PWM outputs are held in a high-impedance state to ensure the
drivers remain off.
Soft-Start Delay and Ramp Times
It may be necessary to set a delay from when an enable signal is
received until the output voltage starts to ramp to its target
value. In addition, the designer may wish to precisely set the time
required for an output to ramp to its target value after the delay
period has expired. These features can be used as part of an
FN8757 Rev.1.00
Jun 26, 2017
overall inrush current management strategy or to precisely
control how fast a load IC is turned on. The ISL68137 gives the
system designer several options for precisely and independently
controlling both the delay and ramp time periods. The soft-start
delay period begins when the EN pin is asserted and ends when
the delay time expires.
The soft-start delay and ramp-up/down times can be configured
using PowerNavigator GUI. The device needs approximately
200µs after enable to initialize before starting to ramp up.
When the soft-start ramp period is set to 0ms, the output ramps
up as quickly as the output load capacitance and loop settings
allow. It is recommended to set the ramps to a non-zero value to
prevent inadvertent fault conditions due to excessive inrush
current.
Stored Configuration Selection
As many as eight configurations can be stored and used at any
time using the on-board nonvolatile memory. Configurations are
assigned an identifier number between 0 and 7 at power-up. The
device will load the configuration indicated by the 1% resistor
value detected on the CONFIG pin. Resistor values are used to
indicate use of one of the eight possible configurations. Table 3
shows the resistor value corresponding to each configuration
identifier.
TABLE 3. RESISTOR VALUES TO CONFIGURATION MAPPING
R CONFIG
(Ω)
CONFIG
ID
6800
0
1800
1
2200
2
2700
3
3300
4
3900
5
4700
6
5600
7
Only the most recent configuration with a given number can be
loaded. The device supports a total of eight stored operations. As
an example, a configuration with the identifier 0 could be saved
eight times or configurations with all eight identifiers could be
stored one time each for a total of eight save operations.
PowerNavigator provides a simple interface to save and load
configurations.
Fault Monitoring and Protection
The ISL68137 actively monitors temperature, input voltage, output
voltage, and output current to detect and report fault conditions.
Fault monitors trigger configurable protective measures to prevent
damage to a load. The power-good indicators, PG0/PG1, are
provided for linking to external system monitors.
A high level of flexibility is provided in the ISL68137 fault logic.
Faults can be enabled or disabled individually. Each fault type can
also be configured to either latch off or retry indefinitely.
Page 17 of 54
ISL68137
Power-Good Signals
The PG0/PG1 pins are open-drain, power-good outputs that
indicate completion of the soft-start sequence and output voltage
of the associated rail within the expected regulation range.
The PG pins can be associated or disassociated with a number of
the available fault types. This allows a system design to be tailored
for almost any condition. In addition, these power-good indicators
will be pulled low when a fault (OCP or OVP) condition or UV
condition is detected on the associated rail.
Output Voltage Protection
Output voltage is measured at the load sensing points
differentially for regulation and the same measurement is used
for OVP and UVP. The fault thresholds are set using PMBus
commands. Figure 18 shows a simplified OVP/UVP block
diagram. The output voltage comparisons are done in the digital
domain.
In addition to total output current, the ISL68137 provides an
individual phase peak current limit that will act on PWM in a
cycle-by-cycle manner. This means that if a phase current is
detected to exceed the OC threshold, the phase PWM signal will
be inverted to move current away from the threshold. In addition
to limiting positive or negative peak current on a cycle-by-cycle
basis, individual phase OC can be configured to limit current
indefinitely or to declare a fault after a programmable number of
consecutive OC cycles. This feature is useful for applications in
which a fault shutdown of the system would not be acceptable
but some ability to limit phase currents is desired. Figures 22
and 23 on page 19 depict this operation. If configured for
indefinite current limit, the converter will act as a current source
and VOUT will not remain at its regulation point. It should be
noted that in this case, VOUT OV or UV protection action may
occur, which could shut the regulator down.
TOTAL OUTPUT CURRENT FAULT
FILTER
VSENx
DIGITAL OV
COMPARATOR
ISL68137
ADC
RGNDx
+
-
PH1 CURRENT
SYNTHESIZER
TIMER

ISUM
PHn
CURRENT
SYNTHESIZER
THRESHOLD
REGISTER
THRESHOLD
REGISTER
FILTER
TO
FAULT
BLOCK
LIMIT
ACT
TO
FAULT
BLOCK
DELAY
PHASE PEAK CURRENT LIMITING AND FAULT
DIGITAL UV
COMPARATOR
COMPARE
COUNT
fSW clk
FIGURE 18. OVP, UVP COMPARATORS
In addition, the ISL68137 features open pin sensing protection to
detect an open of the output voltage sensing circuit. When this
condition is detected, controller operation is suspended.
ACT
DELAY
SLOW SUM OC
FILTER COMPARE
TIMER
FILTER
The device responds to an output overvoltage condition by
disabling the output, declaring a fault, setting the SALRT pin,
setting the PG pin and then pulsing the LFET until the output
voltage has dropped below the threshold. Similarly, the device
responds to an output undervoltage condition by disabling the
output, declaring a fault, setting the SALRT pin and setting the
PG pin. The output will not restart until the EN pin is cycled
(unless the device is configured to retry).
LIMIT
TIMER
+
SoC
FAST SUM OC
COMPARE
TIMER
IPHASEn
+PEAK
LIMIT
May be set
for indefinite
limiting but
no fault
assertion
OCCOUNT
POSITIVE PEAK
LIMITING
COMPARE
COUNT
fSW clk
-PEAK
LIMIT
Switching
Period
Count
Switching
Period
Count
May be set
for indefinite
limiting but
no fault
assertion
UCCOUNT
NEGATIVE PEAK
LIMITING
ACT
TO
FAULT
BLOCK
PULSE BY
PULSE
LIMIT
ACT
TO
FAULT
BLOCK
PULSE BY
PULSE
LIMIT
FIGURE 19. OCP FUNCTIONAL DIAGRAM
Output Current Protection
The ISL68137 offers a comprehensive overcurrent protection
scheme. Each phase is protected from both excessive peak
current and sustained current. In addition, the system is
protected from sustained total output overcurrent.
Figure 19 depicts a block diagram of the system total output
current protection scheme. In this scheme, the phase currents
are summed to form ISUM. ISUM is then fed to dual response
paths allowing the user to program separate LPF, threshold and
response time. One path is intended to allow response more
quickly than the other path. With this system, the user can allow
high peak total current for a short time and a lower level of
current for a sustained time. Note that neither of these paths
affect PWM activity on a cycle-by-cycle basis. The characteristics
of each path are easily set in PowerNavigator.
FN8757 Rev.1.00
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Page 18 of 54
ISL68137
An example of the OCP_Fast and OCP_Slow waveforms are
shown in Figures 20 and 21.
POSITIVE_CURRENT_LIMITING_PER_PHASE
OCP_FAST_THRESHOLD
PWM
OCP_SLOW_THRESHOLD
PLACEHOLDER
FILTER TIME CONSTANT
PGOOD
OCP_FAST COUNTER
TWARN
PWM
FIGURE 22. POSITIVE PEAK PHASE CURRENT LIMITING
PGOOD
FIGURE 20. OCP_FAST
NEGATIVE_CURRENT_LIMITING_PER_PHASE
OCP_FAST_THRESHOLD
OCP_SLOW_THRESHOLD
PLACEHOLDER
OCP_SLOW COUNTER
FILTER TIME CONSTANT
PWM
PGOOD
TWARN
PWM
FIGURE 23. NEGATIVE PEAK PHASE CURRENT LIMITING
PGOOD
FIGURE 21. OCP_SLOW
FN8757 Rev.1.00
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ISL68137
Smart Power Stage OC Fault Detect
Intersil Smart Power Stage (SPS) devices will output a large
signal on their IMON lines if peak current exceeds their
preprogrammed threshold. (For more detail about this
functionality, refer to the relevant SPS datasheet.) The ISL68137
is equipped to detect this fault flag and immediately shut down.
This detector is enabled on the GUI Overcurrent Fault setup
screen.
This feature functions by detecting signals that exceed the
current sense ADC full-scale range. If this detector is disabled
while using an Intersil SPS, the SPS Fault# signal must be
connected to the controller Enable pin of the associated rail. This
will ensure that an SPS OC event will be detected and the
converter will shut down.
Thermal Monitoring and Protection
The TWARN pin indicates the temperature status of the voltage
regulator. The TWARN pin is an open-drain output and an
external pull-up resistor is required. This signal is valid only after
the controller is enabled.
The TWARN signal can be used to inform the system that the
temperature of the voltage regulator is too high and the load
should reduce its power consumption. TWARN only indicates a
thermal warning, not a fault.
The thermal monitoring function block diagram is shown in
Figure 24. The ISL68137 has two over-temperature thresholds,
which allow both warning and fault indications. Each
temperature sensor threshold can be independently
programmed in the PowerNavigator GUI. Figure 25 shows the
thermal warning to TWARN and Figure 26 shows the
over-temperature fault to shutdown. PGOOD and TWARN can be
configured to indicate these warning and fault thresholds using
the PowerNavigator GUI.
HIGH OT THRESHOLD
LOW OT THRESHOLD
PWM
PGOOD
TWARN
FIGURE 25. THERMAL WARNING TO TWARN
HIGH OT THRESHOLD
LOW OT THRESHOLD
PWM
PGOOD
TWARN
FIGURE 26. OVER-TEMPERATURE FAULT
TELEMETRY
CONTROL
TEMP
SENSORS
TMONx
DELTA
VBE
IC
TMAX
ADC
TWARN
VCCS
TEMP
MONITOR
FIGURE 24. BLOCK DIAGRAM OF THERMAL MONITORING
FUNCTION
FN8757 Rev.1.00
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Page 20 of 54
ISL68137
Layout and Design Considerations
In addition to TB379, the following PCB layout and design
strategies are intended to minimize the noise coupling, the
impact of board parasitic impedances on converter performance,
and to optimize the heat dissipating capabilities of the printed
circuit board. This section highlights some important practices,
which should be followed during the layout process.
Table 4 provides general guidance on best practices related to
pin noise sensitivity. Use of good engineering judgment is
required to implement designs based on criteria specific to the
situation.
TABLE 4. PIN DESIGN AND/OR LAYOUT CONSIDERATIONS
PIN
NAME
NOISE
SENSITIVE
VINSEN
Yes
Connects to the resistor divider between VIN and
GND (see Figure 17 on page 17). Filter VINSEN
with 10nF to GND.
RGNDx
VSENx
Yes
Treat each of the remote voltage sense pairs as
differential signals in the PCB layout. They
should be routed side by side on the same layer.
They should not be routed in proximity to noisy
signals like PWM or Phase. Tie to ground when
not used.
PGx
No
Open-drain. 3.3V maximum pull-up voltage. Tie
to ground when not used.
SCL, SDA,
SALRT
Yes
50kHz to 2MHz signal during communication,
pair up with SALRT and route carefully. 20 mils
spacing within SDA, SALRT, and SCL; and more
than 30 mils to all other signals. Refer to the
SMBus design guidelines and place proper
termination resistance for impedance
matching. Tie to ground when not used.
AVS_CLK,
AVS_SDA,
AVS_MDA
Yes
Up to 50MHz signals during communication,
route carefully. 20 mils spacing within CLK, SDA,
and MDA; and more than 30 mils to all other
signals. Tie CLK and MDA to ground when not
used.
TMONx
Yes
When diode sensing is used, VCCS is the return
path for the delta Vbe currents. Use a separate
VCCS route specifically for diode temp sense. A
filter capacitor no greater than 500pF should be
placed between each TMON pin and the VCCS
pin near the IC. Tie to ground when not used.
TWARN
No
Open-drain. 3.3V maximum pull-up voltage.
VCC
Yes
Place at least 2.2µF MLCC decoupling capacitor
directly at the pin.
VCCS
Yes
Place 4.7µF MLCC decoupling capacitor directly
at the pin.
PWM
No
Avoid routing near noise sensitive analog lines
such as current sense or voltage sense.
FN8757 Rev.1.00
Jun 26, 2017
DESCRIPTION
TABLE 4. PIN DESIGN AND/OR LAYOUT CONSIDERATIONS (Continued)
PIN
NAME
NOISE
SENSITIVE
CSx
CSRTNx
Yes
Treat each of the current sense pairs as
differential signals in the PCB layout. They
should be routed side by side on the same layer.
They should not be routed in proximity to noisy
signals like PWM or Phase. Proper routing of
current sense is perhaps the most critical of all
the layout tasks. Tie to ground when not used.
GND
Yes
This EPAD is the return of PWM output drivers.
Use four or more vias to directly connect the
EPAD to the power ground plane.
General
Comments
DESCRIPTION
The layer next to the top or bottom layer is
preferred to be ground layers, while the signal
layers can be sandwiched in the ground layers if
possible.
Page 21 of 54
ISL68137
PMBus Operation
TABLE 5. PMBus 8-BIT AND 7-BIT FORMAT ADDRESS (HEX)
The ISL68137 PMBus slave address is pin selectable using the
SA pin and resistor value described in Table 2 on page 13. For
proper operation, users should follow the PMBus protocol, as
shown in “PMBus Protocol” on page 23. The supported PMBus
addresses are in 8-bit format (including write and read bit), see
Table 5. The least significant bit of the 8-bit address is for write
(0h) and read (1h). PMBus commands are in the range from
0x00h to 0xFFh. For the ISL68137, Page 0 corresponds to
Output 0 and Page 1 to Output 1. For reference purposes, the
7-bit format addresses are also summarized in Table 5.
8-BIT
7-BIT
8-BIT
7-BIT
8-BIT
7-BIT
8-BIT
7-BIT
80/81
40
A0/A1
50
B0/B1
58
C0/C1
60
82/83
41
A2/A3
51
B2/B3
59
C2/C3
61
88/89
44
A8/A9
54
B8/B9
5C
C8/C9
64
8A/8B
45
AA/AB
55
BA/BB
5D
CA/CB
65
The PMBus data formats follow PMBus specification version 1.3
and SMBus version 2.0.
Basic PMBus telemetry commands are summarized in “PMBus
Command Summary” on page 24.
3.3V
VCC
1.2V
Tel ADC Customer Start-up PROGRAM CONFIGURATION
Fac
PLL
USE PREVIOUS PROGRAMMED
VCCS
Config LOCKED Initialized Config Diagnostics (BT, TMAX, PS, DE, etc.)
CONFIGURATION FOR START-UP AND OPERATION
LOAD
DONE
LOAD
DONE
PROGRAM CONFIGURATION
PROGRAM CONFIGURATION
VCCS
(BT, TMAX, PS, DE, etc.)
(BT, TMAX, PS, DE, etc.)
POR
~30ms
ENABLE
INDEFINITELY
PMBus
COMMAND
PMBus
COMMAND
PMBus
COMMAND
PMBus
COMMAND
VOUT
FIGURE 27. SIMPLIFIED PMBus INITIALIZATION TIMING DIAGRAM
FN8757 Rev.1.00
Jun 26, 2017
Page 22 of 54
ISL68137
PMBus Protocol
1. Send Byte Protocol
S: Start Condition
A: Acknowledge (“0”)
S
7+1
1
Slave Address_0
A
1
8
1
1
N: Not Acknowledge (“1”)
A
PEC
A
P
W: Write (“0”)
8
Command Code
RS: Repeated Start Condition
R: Read (“1”)
Optional 9 bits for SMBus/PMBus
NOT used in I2C
PEC: Packet Error Checking
P: Stop Condition
Example command: 03h Clear Faults
(This will clear all of the bits in Status Byte for the selected rail)
Acknowledge or DATA from Slave,
ISL68137 Controller
Not Used for 1-Byte Word
2. Write Byte/Word Protocol
1
7+1
S
Slave Address_0
1
8
Command Code
A
1
8
1
8
1
8
1
1
A
Low Data Byte
A
High Data Byte
A
PEC
A
P
Optional 9 bits for SMBus/PMBus
NOT used in I2C
Example command: 21h VOUT_COMMAND
3. Read Byte/Word Protocol
1
7+1
1
8
1
S
Slave Address_0
A
Command Code
A
1
7+1
RS
Slave Address_1
Not Used for 1-Byte Word Read
1
8
1
8
1
8
A
Low Data Byte
A
High Data Byte
A
PEC
1
1
N P
Optional 9 bits for SMBus/PMBus
NOT used in I2C
Example command: 8B READ_VOUT (Two words, read voltage of the selected rail).
STOP (P) bit is NOT allowed before the repeated START condition when “reading” contents of a register.
4. Group Command Protocol - No more than one command can be sent to the same Address
1
7+1
S
1
8
1
A
Command Code
A
7+1
1
8
Slave ADDR2_0
A
Command Code
Slave ADDR1_0
1
S
1
RS
7+1
1
Slave ADDR3_0
A
8
1
8
1
8
1
Low Data Byte
A
High Data Byte
A
PEC
A
1
8
1
8
1
A
Data Byte
A
PEC
A
8
8
Command Code
Low Data Byte
A
1
8
1
8
1
1
A
High Data Byte
A
PEC
A
P
Optional 9 bits for SMBus/PMBus
NOT used in I2C
5. Alert Response Address (ARA, 0001_1001, 25h) for SMBus and PMBus, not used for I2C
1
S
7+1
ALERT Addr_1
1
A
7+1
Slave_Address_1
1
8
1
1
A
PEC
A
P
Optional 9 bits for SMBus/PMBus
NOT used in I2C
FN8757 Rev.1.00
Jun 26, 2017
Page 23 of 54
ISL68137
PMBus Command Summary
CODE
COMMAND NAME
DESCRIPTION
TYPE
DATA
FORMAT
DEFAULT
VALUE
DEFAULT SETTING
00h
PAGE
Selects Output 0, 1, or both
R/W
Bit
00h
Page 0
01h
OPERATION
Enable/disable, margin settings
R/W
Bit
08h
Off
02h
ON_OFF_CONFIG
On/off configuration settings
R/W
Bit
16h
ENABLE pin control
03h
CLEAR_FAULTS
Clears all fault bits in all registers and releases the
SALRT pin
Write
N/A
N/A
10h
WRITE_PROTECT
Write protection to sets of commands
R/W
Bit
00h
No write protection
20h
VOUT_MODE
Defines format for output voltage related commands
Read
Bit
40h
Direct format
21h
VOUT_COMMAND
Sets the nominal VOUT target
R/W
Direct
0384h
900mV
22h
VOUT_TRIM
Applies trim voltage to VOUT set-point
R/W
Direct
0000h
0mV
24h
VOUT_MAX
Absolute maximum voltage setting
R/W
Direct
08FCh
2300mV
25h
VOUT_MARGIN_HIGH
Sets VOUT target during margin high
R/W
Direct
0640h
1600mV
26h
VOUT_MARGIN_LOW
Sets VOUT target during margin low
R/W
Direct
00FAh
250mV
27h
VOUT_TRANSITION_RATE
Slew rate setting for VOUT changes
R/W
Direct
0064h
10mV/µs
28h
VOUT_DROOP
Sets the loadline (V/I slope) resistance for the output
R/W
Direct
0000h
0µV/A
2Bh
VOUT_MIN
Absolute minimum target voltage setting
R/W
Direct
0000h
0mV
40h
VOUT_OV_FAULT_LIMIT
Sets the VOUT overvoltage fault threshold
R/W
Direct
076Ch
1900mV
44h
VOUT_UV_FAULT_LIMIT
Sets the VOUT undervoltage fault threshold
R/W
Direct
0000h
0mV
4Fh
OT_FAULT_LIMIT
Sets the over-temperature fault threshold
R/W
Direct
007Dh
+125°C
51h
OT_WARN_LIMIT
Sets the over-temperature warning threshold
R/W
Direct
07D0h
+2000°C
55h
VIN_OV_FAULT_LIMIT
Sets the VIN overvoltage fault threshold
R/W
Direct
36B0h
14,000mV
59h
VIN_UV_FAULT_LIMIT
Sets the VIN undervoltage fault threshold
R/W
Direct
1F40h
8,000mV
5Bh
IIN_OC_FAULT_LIMIT
Sets the IIN overcurrent fault threshold
R/W
Direct
0032h
50A
60h
TON_DELAY
Sets the delay time from enable to VOUT rise
R/W
Direct
0014h
200µs
61h
TON_RISE
Turn-on rise time
R/W
Direct
01F4h
500µs
64h
TOFF_DELAY
Turn-off delay time
R/W
Direct
0000h
0µs
65h
TOFF_FALL
Turn-off fall time
R/W
Direct
01F4h
500µs
78h
STATUS_BYTE
First byte of STATUS_WORD
Read
Bit
N/A
N/A
79h
STATUS_WORD
Summary of critical faults
Read
Bit
N/A
N/A
7Ah
STATUS_VOUT
Reports VOUT faults
Read
Bit
N/A
N/A
7Bh
STATUS_IOUT
Reports IOUT faults
Read
Bit
N/A
N/A
7Ch
STATUS_INPUT
Reports input faults
Read
Bit
N/A
N/A
7Dh
STATUS_TEMPERATURE
Reports temperature warnings/faults
Read
Bit
N/A
N/A
7Eh
STATUS_CML
Reports communication, memory, logic errors
Read
Bit
N/A
N/A
80h
STATUS_MFR_SPECIFIC
Reports specific events
Read
Bit
N/A
N/A
88h
READ_VIN
Reports input voltage measurement
Read
Direct
N/A
N/A
89h
READ_IIN
Reports input current measurement
Read
Direct
N/A
N/A
8Bh
READ_VOUT
Reports output voltage measurement
Read
Direct
N/A
N/A
8Ch
READ_IOUT
Reports output current measurement
Read
Direct
N/A
N/A
8Dh
READ_TEMPERATURE_1
Reports power stage temperature measurement
Read
Direct
N/A
N/A
FN8757 Rev.1.00
Jun 26, 2017
Page 24 of 54
ISL68137
PMBus Command Summary (Continued)
CODE
COMMAND NAME
DESCRIPTION
TYPE
DATA
FORMAT
DEFAULT
VALUE
DEFAULT SETTING
8Eh
READ_TEMPERATURE_2
Reports TMON0 temperature measurement
Read
Direct
N/A
N/A
8Fh
READ_TEMPERATURE_3
Reports TMON1 temperature measurement
Read
Direct
N/A
N/A
96h
READ_POUT
Reports output power
Read
Direct
N/A
N/A
97h
READ_PIN
Reports input power
Read
Direct
N/A
N/A
98h
PMBUS_REVISION
Reports specific events
Read
Bit
33h
Revision 1.3
ADh
IC_DEVICE_ID
Reports device identification information
Read
Bit
49D22700h
ISL68137
AEh
IC_DEVICE_REV
Reports device revision information
Read
Bit
N/A
N/A
E7h
APPLY_SETTINGS
Instructs device to apply PMBus setting changes
Write
BIT
01h
N/A
F2h
RESTORE_CONFIG
Allows selection of configurations from NVM
Write
BIT
N/A
N/A
PMBus Use Guidelines
All commands can be read at any time.
Always disable the outputs when writing commands that change device settings. Exceptions to this rule are commands intended to be
written while the device is enabled, for example, OPERATION.
PMBus Data Formats
Direct (D)
The Direct data format is a two byte two’s complement binary integer.
Bit Field (BIT)
A breakdown of Bit Field is provided in “PMBus Command Detail” on page 26.
FN8757 Rev.1.00
Jun 26, 2017
Page 25 of 54
ISL68137
PMBus Command Detail
PAGE (00h)
Definition: Selects Controller 0, Controller 1, or both Controllers 0 and 1 to receive commands. All commands following this command
will be received and acted on by the selected controller or controllers.
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Default Value: 00h
COMMAND
PAGE (00h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
Function
See Following Table
Default Value
0
0
0
0
0
BITS 7:4
BITS 3:0
PAGE
0000
0000
0
0000
0001
1
1111
1111
Both
FN8757 Rev.1.00
Jun 26, 2017
Page 26 of 54
ISL68137
OPERATION (01h)
Definition: Sets enable state when configured for PMBus enable. Sets the source of the target VOUT. The device always acts on faults
during margin. The table below reflects the valid settings for the device.
Paged or Global: Paged
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Default Value: 08h
COMMAND
OPERATION (01h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
Function
Default Value
See Following Table
0
1
BIT NUMBER
PURPOSE
BIT VALUE
Bits 7:6
Enable/Disable
00
Immediate Off (decay)
01
Soft-Off (Use TOFF_DELAY and TOFF_FALL)
Bits 5:4
VOUT Source
MEANING
10
On
00
VOUT_COMMAND
01
VOUT_MARGIN_LOW
10
VOUT_MARGIN_HIGH
11
AVSBus Target Rail Voltage
Bits 3:2
Margin Response
10
Act on Faults
Bit 1
AVSBus Copy
0
VOUT_COMMAND remains unchanged
1
AVSBus Target Rail Voltage changes are copied
to VOUT_COMMAND
0
Not Used
Bit 0
FN8757 Rev.1.00
Jun 26, 2017
Not Used
Page 27 of 54
ISL68137
ON_OFF_CONFIG (02h)
Definition: Configures the interpretation of the OPERATION command and the ENABLE pin (EN). The below table reflects the valid
settings for the device.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Default Value: 16h (ENABLE pin control)
COMMAND
ON_OFF_CONFIG (02h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
Function
See Following Table
Default Value
BIT NUMBER
PURPOSE
0
0
BIT VALUE
MEANING
7:5
Not Used
000
Not used
4:2
Sets the Source of Enable
000
Device always enabled regardless of pin or OPERATION
command state
101
Device starts from Enable pin only
110
Device starts from OPERATION command only
111
Device starts from OPERATION command and Enable pin
1
Enable Pin Polarity
1
Active High only
0
Enable Pin Turn Off Action
1
Turn off immediately with decay
0
Use programmed TOFF_DELAY and TOFF_FALL settings
CLEAR_FAULTS (03h)
Definition: Clears all fault bits in all registers and releases the SALRT pin (if asserted) simultaneously. If a fault condition still exits, the
bit will reassert immediately. This command will not restart a device if it is shut down, it will only clear the faults.
Paged or Global: Global
Data Length in Bytes: 0
Data Format: N/A
Type: Write Only
Default Value: N/A
FN8757 Rev.1.00
Jun 26, 2017
Page 28 of 54
ISL68137
WRITE_PROTECT (10h)
Definition: Sets the write protection of certain configuration commands.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field
Type: R/W
Default Value: 00h (Enable all writes)
COMMAND
WRITE_PROTECT (10h)
Format
Bit Field
Bit Position
7
6
5
Access
R/W
R/W
R/W
Function
4
3:0
2
1
0
R/W
R/W
R/W
R/W
R/W
0
0
0
See Following Table
Default Value
0
0
0
0
SETTINGS
0
PROTECTION
40h
Disables all writes except to WRITE_PROTECT, OPERATION, CLEAR_FAULTS, PAGE
20h
Disables all writes except all above plus ON_OFF_CONFIG and VOUT_COMMAND, VOUT_TRIM
00h
Enables all writes
NOTE: Any settings other than the three shown in the table will result in an invalid data fault.
VOUT_MODE (20h)
Definition: Returns the supported VOUT mode. This device only supports absolute direct mode.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: 40h
Units: N/A
Equation: N/A
VOUT_COMMAND (21h)
Definition: Sets the value of VOUT when the OPERATION command is configured for PMBus nominal operation.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0384h (900mV)
Units: mV
Equation: VOUT_COMMAND = (Direct value)
Range: VOUT_MIN to VOUT_MAX
COMMAND
VOUT_COMMAND (21h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
1
0
0
Unsigned Integer
0
0
0
0
0
0
1
1
1
Page 29 of 54
ISL68137
VOUT_TRIM (22h)
Definition: Sets a fixed trim voltage to the output voltage command value. This command is typically used to calibrate a device in the
application circuit.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0000h (0mV)
Units: mV
Equation: VOUT_TRIM = (Direct value)
Range: ±250mV
COMMAND
VOUT_TRIM (22h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
Function
Default Value
Two’s Complement Integer
0
0
0
0
0
0
0
0
0
0
VOUT_MAX (24h)
Definition: Sets the maximum allowed VOUT target regardless of any other commands or combinations.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 08FCh (2300mV)
Units: mV
Equation: VOUT_MAX = (Direct value)
Range: 0mV to 3300mV
COMMAND
VOUT_MAX (24h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
1
0
0
1
1
1
1
1
0
0
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Unsigned Integer
0
1
Page 30 of 54
ISL68137
VOUT_MARGIN_HIGH (25h)
Definition: Sets the value of VOUT when the OPERATION command is configured for margin high.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0640h (1600mV)
Units: mV
Equation: VOUT_MARGIN_HIGH = (Direct value)
Range: VOUT_MIN to VOUT_MAX
COMMAND
VOUT_MARGIN_HIGH (25h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
0
0
0
0
0
Unsigned Integer
0
0
0
0
0
1
1
0
0
VOUT_MARGIN_LOW (26h)
Definition: Sets the value of VOUT when the OPERATION command is configured for margin low.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 00FAh (250mV)
Units: mV
Equation: VOUT_MARGIN_LOW = (Direct value)
Range: VOUT_MIN to VOUT_MAX
COMMAND
VOUT_MARGIN_LOW (26h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
1
1
1
0
1
0
Unsigned Integer
0
0
0
0
0
0
0
0
1
Page 31 of 54
ISL68137
VOUT_TRANSITION_RATE (27h)
Definition: Sets the output voltage rate of change during regulation. Changes to this setting require a write to the APPLY_SETTINGS
command before the change will take effect.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0064h (10mV/µs)
Units: µV/µs
Equation: VOUT_TRANSITION_RATE = (Direct value)*100
Range: 100µV/µs to 100mV/µs
COMMAND
VOUT_TRANSITION_RATE (27h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
1
0
0
1
0
0
Unsigned Integer
0
0
0
0
0
0
0
0
0
VOUT_DROOP (28h)
Definition: Sets the output voltage rate of change during regulation. Changes to this setting require a write to the APPLY_SETTINGS
command before the change will take effect.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0000h (0µV/A)
Units: µV/A
Equation: VOUT_DROOP = (Direct value)*10
Range: 0µV/A to 16,000µV/A
COMMAND
VOUT_DROOP (28h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Unsigned Integer
0
0
Page 32 of 54
ISL68137
VOUT_MIN (2Bh)
Definition: Sets the minimum allowed VOUT target regardless of any other commands or combinations.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0000h (0mV)
Units: mV
Equation: VOUT_MIN = (Direct value)
Range: 0V to VOUT_MAX
COMMAND
VOUT_MIN (2Bh)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
Unsigned Integer
0
0
0
0
0
0
0
0
0
VOUT_OV_FAULT_LIMIT (40h)
Definition: Sets the output overvoltage fault threshold. Changes to this setting require a write to the APPLY_SETTINGS command before
the change will take effect.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 076Ch (1900mV)
Units: mV
Equation: VOUT_OV_FAULT_LIMIT = (Direct value)
Range: 0V to VOUT_MAX
COMMAND
VOUT_OV_FAULT_LIMIT (40h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
1
1
1
1
0
1
1
0
0
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Unsigned Integer
1
0
Page 33 of 54
ISL68137
VOUT_UV_FAULT_LIMIT (44h)
Definition: Sets the VOUT undervoltage fault threshold. This fault is masked during ramp or when disabled.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0000h (0mV)
Units: mV
Equation: VOUT_UV_FAULT_LIMIT = (Direct value)
Range: 0V to VOUT_MAX
COMMAND
VOUT_UV_FAULT_LIMIT (44h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
Unsigned Integer
0
0
0
0
0
0
0
0
0
OT_FAULT_LIMIT (4Fh)
Definition: Sets the power stage over-temperature fault limit.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 007Dh (+125°C)
Units: °C
Equation: OT_FAULT_LIMIT = (Direct value)
Range: 0°C to +2000°C
COMMAND
OT_FAULT_LIMIT (4Fh)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
1
1
1
1
0
1
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Two’s Complement Integer
0
0
0
1
Page 34 of 54
ISL68137
OT_WARN_LIMIT (51h)
Definition: Sets the system over-temperature warn limit. If any measured temperature exceeds this value, the device will:
• Set the TEMPERATURE bit in STATUS_BYTE and STATUS_WORD
• Set the OT_WARNING bit in STATUS_TEMPERATURE
• Set the SALRT pin
• Set the TWARN pin
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 07D0h (+2000°C)
Units: °C
Equation: OT_WARN_LIMIT = (Direct value)
Range: 0 to +2000°C
COMMAND
OT_WARN_LIMIT (51h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
1
0
0
0
0
Function
Default Value
Two’s Complement Integer
0
0
0
0
0
1
1
1
1
1
VIN_OV_FAULT_LIMIT (55h)
Definition: Sets the VIN overvoltage fault threshold. Changes to this setting require a write to the APPLY_SETTINGS command before the
change will take effect.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 36B0h (14,000mV)
Units: mV
Equation: VIN_OV_FAULT_LIMIT = (Direct value)
Range: 0mV to 16,000mV
COMMAND
VIN_OV_FAULT_LIMIT (55h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
1
1
0
1
1
0
1
1
0
0
0
0
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Unsigned Integer
0
1
Page 35 of 54
ISL68137
VIN_UV_FAULT_LIMIT (59h)
Definition: Sets the VIN undervoltage fault threshold. Also referred to as Undervoltage Lockout (UVLO). Changes to this setting require a
write to the APPLY_SETTINGS command before the change will take effect.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 1F40h (8,000mV)
Units: mV
Equation: VIN_UV_FAULT_LIMIT = (Direct value)
Range: 0mV to 16,000mV
COMMAND
VIN_UV_FAULT_LIMIT (59h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Default Value
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
0
0
0
0
0
Unsigned Integer
0
0
0
1
1
1
1
1
0
IIN_OC_FAULT_LIMIT (5Bh)
Definition: Sets the IIN overcurrent fault threshold. Changes to this setting require a write to the APPLY_SETTINGS command before the
change will take effect.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0032h (50A)
Units: A
Equation: IIN_OC_FAULT_LIMIT = (Direct value)
Range: 0A to 50A
COMMAND
IIN_OC_FAULT_LIMIT (5Bh)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
1
1
0
0
1
0
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Unsigned Integer
0
0
Page 36 of 54
ISL68137
TON_DELAY (60h)
Definition: Sets the delay time of VOUT during enable.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0014h (200µs)
Units: µs
Equation: TON_DELAY = (Direct value)*10
Range: 200µs to 655,340µs
COMMAND
TON_DELAY (60h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
1
0
1
0
0
Unsigned Integer
Default Value
0
0
0
0
0
0
0
0
0
TON_RISE (61h)
Definition: Sets the rise time of VOUT during enable. Changes to this setting require a write to the APPLY_SETTINGS command before
the change will take effect. This function uses the value of VOUT to calculate rise time, so APPLY_SETTINGS must be sent after any
change to the VOUT target for accurate rise time.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 01F4h (500µs)
Units: µs
Equation: TON_RISE = (Direct value)
Range: 0µs to 10,000µs
COMMAND
TON_RISE (61h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
1
1
1
0
1
0
0
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Unsigned Integer
1
1
Page 37 of 54
ISL68137
TOFF_DELAY (64h)
Definition: Sets the delay time of VOUT during disable.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 0000h (0µs)
Units: µs
Equation: TOFF_DELAY = (Direct value)*10
Range: 0µs to 10,000µs
COMMAND
TOFF_DELAY (64h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
8
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
Unsigned Integer
Default Value
0
0
0
0
0
0
0
0
0
TOFF_FALL (65h)
Definition: Sets the fall time of VOUT during disable. Changes to this setting require a write to the APPLY_SETTINGS command before
the change will take effect. This function uses the value of VOUT to calculate fall time, so APPLY_SETTINGS must be sent after any
change to the VOUT target for accurate fall time.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: 01F4h (500µs)
Units: µs
Equation: TOFF_FALL = (Direct value) *1
Range: 0µs to 10,000µs
COMMAND
TOFF_FALL (65h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
1
1
1
0
1
0
0
Function
Default Value
FN8757 Rev.1.00
Jun 26, 2017
Unsigned Integer
1
1
Page 38 of 54
ISL68137
STATUS_BYTE (78h)
Definition: Returns a summary of the unit’s fault status. Based on the information in this byte, the host can get more information by
reading the appropriate status registers. A fault in either output will be reported here.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_BYTE (78h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
Function
See Following Table
BIT NUMBER
STATUS BIT NAME
MEANING
7
Not Used
Not used
6
OFF
This bit is asserted if the unit is not providing power to the output,
regardless of the reason, including simply not being enabled.
5
VOUT_OV_FAULT
An output overvoltage fault has occurred.
4
IOUT_OC_FAULT
An output overcurrent fault has occurred.
3
VIN_UV_FAULT
An input undervoltage fault has occurred.
2
TEMPERATURE
A temperature fault or warning has occurred.
1
CML
A communications, memory, or logic fault has occurred.
0
None of the Above
A status change other than those listed above has occurred.
FN8757 Rev.1.00
Jun 26, 2017
Page 39 of 54
ISL68137
STATUS_WORD (79h)
Definition: Returns a summary of the device’s fault status. Based on the information in these bytes, the host can get more information
by reading the appropriate status registers. A fault in either output will be reported here. The low byte of the STATUS_WORD contains
the same information as the STATUS_BYTE (78h) command.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_WORD (79h)
Format
Bit Field
Bit Position
15
14
13
12
11
10
9
Access
R
R
R
R
R
R
R
Function
8
7
6
5
4
3
2
1
0
R
R
R
R
R
R
R
R
R
See Following Table
BIT NUMBER
STATUS BIT NAME
MEANING
An output voltage fault has occurred.
15
VOUT
14
IOUT
An output current fault has occurred.
13
INPUT
An input voltage fault has occurred.
12
MFR_SPECIFIC
A manufacturer specific event has occurred.
11
POWER_GOOD #
The POWER_GOOD signal, if present, is negated. (Note 8)
10:7
Not Used
Not used
6
OFF
This bit is asserted if the unit is not providing power to the output,
regardless of the reason, including simply not being enabled.
5
VOUT_OV_FAULT
An output overvoltage fault has occurred.
4
IOUT_OC_FAULT
An output overcurrent fault has occurred.
3
VIN_UV_FAULT
An input undervoltage fault has occurred.
2
TEMPERATURE
A temperature fault or warning has occurred.
1
CML
A communications, memory, or logic fault has occurred.
0
None of the Above
A status change other than those listed above has occurred.
NOTE:
8. If the POWER_GOOD# bit is set, this indicates that the POWER_GOOD signal, if present, is signaling that the output power is not good.
FN8757 Rev.1.00
Jun 26, 2017
Page 40 of 54
ISL68137
STATUS_VOUT (7Ah)
Definition: Returns a summary of output voltage faults.
Paged or Global: Paged
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_VOUT (7Ah)
Format
Bit Field
Bit Position
7
6
5
Access
R
R
R
Function
4
3
2
1
0
R
R
R
R
R
See Following Table
BIT NUMBER
STATUS BIT NAME
7
6:5
MEANING
VOUT_OV_FAULT
Indicates an output overvoltage fault.
Not Used
Not used
4
VOUT_UV_FAULT
Indicates an output undervoltage fault.
3
VOUT_MAX Warning
Indicates an output voltage maximum warning.
Not Used
Not used
2:0
STATUS_IOUT (7Bh)
Definition: Returns a summary of output current faults.
Paged or Global: Paged
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_IOUT (7Bh)
Format
Bit Field
Bit Position
7
6
5
Access
R
R
R
Function
4
3
2
1
0
R
R
R
R
R
See Following Table
BIT NUMBER
MEANING
7
An output overcurrent fault has occurred.
6
An output overcurrent and undervoltage fault has occurred.
5:4
3
2:0
FN8757 Rev.1.00
Jun 26, 2017
Not used
A current share fault has occurred.
Not used
Page 41 of 54
ISL68137
STATUS_INPUT (7Ch)
Definition: Returns a summary of input voltage faults.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_INPUT (7Ch)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
Function
See Following Table
BIT NUMBER
MEANING
7
An input overvoltage fault has occurred.
6:5
4
Not used
An input undervoltage fault has occurred.
3
Not used
2
An input overcurrent fault has occurred.
1:0
Not used
STATUS_TEMPERATURE (7Dh)
Definition: Returns a summary of temperature related faults.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_TEMPERATURE (7Dh)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
Function
See Following Table
BIT NUMBER
MEANING
7
An over-temperature fault has occurred.
6
An over-temperature warning has occurred.
5
Not used
4
An under-temperature fault has occurred
3:0
FN8757 Rev.1.00
Jun 26, 2017
Not used
Page 42 of 54
ISL68137
STATUS_CML (7Eh)
Definition: Returns a summary of any communications, logic and/or memory errors.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_CML (7Eh)
Format
Bit Field
Bit Position
7
6
5
Access
R
R
R
Function
3
2
1
0
R
R
R
R
R
See Following Table
BIT NUMBER
7
4
MEANING
Invalid or unsupported PMBus Command was received.
6
The PMBus command was sent with invalid or unsupported data.
5
A packet error was detected in the PMBus command.
4
Memory fault detected.
3
Processor fault detected.
2
Not used
1
A communication fault other than the ones listed in this table has occurred.
0
A memory or logic fault not listed above was detected.
STATUS_MFR_SPECIFIC (80h)
Definition: Returns the status of specific information detailed below.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: N/A
COMMAND
STATUS_MFR_SPECIFIC (80h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
Function
See Following Table
BIT
MEANING
7:2
Not used
1
OTP NVM memory is full
0
Not used
FN8757 Rev.1.00
Jun 26, 2017
Page 43 of 54
ISL68137
READ_VIN (88h)
Definition: Returns the input voltage reading.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: mV
Equation: READ_VIN = (Direct value)
COMMAND
READ_VIN (88h)
Format
Direct
Bit Position
15
14
13
12
11
10
Access
R
R
R
R
R
R
Function
9
8
7
6
5
4
3
2
1
0
R
R
R
R
R
R
R
R
R
R
Two’s Complement Integer
READ_IIN (89h)
Definition: Returns the input current reading.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: A
Equation: READ_IIN = (Direct value)/100
COMMAND
READ_IIN (89h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Function
Two’s Complement Integer
READ_VOUT (8Bh)
Definition: Returns the output voltage reading.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: mV
Equation: READ_VOUT = (Direct value)
COMMAND
READ_VOUT (8Bh)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Function
FN8757 Rev.1.00
Jun 26, 2017
Two’s Complement Integer
Page 44 of 54
ISL68137
READ_IOUT (8Ch)
Definition: Returns the output current reading.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: A
Equation: READ_IOUT = (Direct value)/10
COMMAND
READ_IOUT (8Ch)
Format
Direct
Bit Position
15
14
13
12
11
10
Access
R
R
R
R
R
R
Function
9
8
7
6
5
4
3
2
1
0
R
R
R
R
R
R
R
R
R
R
Two’s Complement Integer
READ_TEMPERATURE_1 (8Dh)
Definition: Returns the temperature reading of the power stage.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: °C
Equation: READ_TEMPERATURE_1 = (Direct value)
COMMAND
READ_TEMPERATURE_1 (8Dh)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Function
Two’s Complement Integer
READ_TEMPERATURE_2 (8Eh)
Definition: Returns the temperature reading from a remote diode connected to TMON0 when configured for diode sensing.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: °C
Equation: READ_TEMPERATURE_2 = (Direct value)
COMMAND
READ_TEMPERATURE_2 (8Eh)
Format
Direct
Bit Position
15
14
13
12
11
10
Access
R
R
R
R
R
R
Function
FN8757 Rev.1.00
Jun 26, 2017
9
8
7
6
5
4
3
2
1
0
R
R
R
R
R
R
R
R
R
R
Two’s Complement Integer
Page 45 of 54
ISL68137
READ_TEMPERATURE_3 (8Fh)
Definition: Returns the temperature reading from a remote diode connected to TMON1 when configured for diode sensing.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: °C
Equation: READ_TEMPERATURE_3 = (Direct value)
COMMAND
READ_TEMPERATURE_3 (8Fh)
Format
Direct
Bit Position
15
14
13
12
11
10
Access
R
R
R
R
R
R
Function
9
8
7
6
5
4
3
2
1
0
R
R
R
R
R
R
R
R
R
R
Two’s Complement Integer
READ_POUT (96h)
Definition: Returns the output power.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: W
Equation: READ_POUT = (Direct value)
COMMAND
READ_POUT (96h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Function
Two’s Complement Integer
READ_PIN (97h)
Definition: Returns the input power.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: W
Equation: READ_PIN = (Direct value)
COMMAND
READ_PIN (97h)
Format
Direct
Bit Position
15
14
13
12
11
10
Access
R
R
R
R
R
R
Function
FN8757 Rev.1.00
Jun 26, 2017
9
8
7
6
5
4
3
2
1
0
R
R
R
R
R
R
R
R
R
R
Two’s Complement Integer
Page 46 of 54
ISL68137
PMBUS_REVISION (98h)
Definition: Returns the revision of the PMBus specification to which the device is compliant.
Data Length in Bytes: 1
Data Format: Bit Field
Type: Read Only
Default Value: 33h (Part 1 Revision 1.3, Part 2 Revision 1.3)
COMMAND
PMBUS_REVISION (98h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
0
0
1
0
1
1
Function
Default Value
See Following Table
1
0
BITS 7:4
PART 1 REVISION
BITS 3:0
PART 2 REVISION
0000
1.0
0000
1.0
0001
1.1
0001
1.1
0010
1.2
0010
1.2
0011
1.3
0011
1.3
IC_DEVICE_ID (ADh)
Definition: Returns device identification information.
Paged or Global: Global
Data Length in Bytes: 4
Data Format: Bit Field
Type: Block Read
Default Value: 49D22700h
COMMAND
IC_DEVICE_ID (ADh)
Format
Block Read
Byte Position
3
2
1
0
Function
MFR code
ID High Byte
ID Low Byte
Reserved
Default Value
49h
D2h
27h
00h
IC_DEVICE_REV (AEh)
Definition: Returns device revision information.
Paged or Global: Global
Data Length in Bytes: 4
Data Format: Bit Field
Type: Block Read
Default Value: N/A
COMMAND
IC_DEVICE_REV (AEh)
Format
Block Read
Bit Position
23:16
15:8
7:4
3:0
Function
Firmware Revision
Factory Configuration
Chip Foundry Site
IC Revision
Default Value
N/A
N/A
N/A
N/A
FN8757 Rev.1.00
Jun 26, 2017
Page 47 of 54
ISL68137
APPLY_SETTINGS (E7h)
Definition: Instructs the controller to use new PMBus parameters. Send 01h to this command after making one or more changes to
certain PMBus threshold commands that require rescaling of operational values. The commands that require this are
VOUT_TRANSITION_RATE, VOUT_DROOP, VOUT_OV_FAULT_LIMIT, VIN_OV_FAULT_LIMIT, VIN_UV_FAULT_LIMIT, IIN_OC_FAULT_LIMIT,
TON_RISE, and TOFF_FALL.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Bit
Type: Write Only
Default Value: 01h
Units: N/A
Equation: N/A
RESTORE_CONFIG (F2h)
Definition: Identifies the configuration to be restored from NVM and loads the store’s settings into the device’s active memory.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit
Type: Write Only
Default Value: N/A
COMMAND
RESTORE_CONFIG (F2h)
Format
Bit Field
Bit Position
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
N/A
N/A
N/A
N/A
Function
Default Value
See Following Table
BIT NUMBER
N/A
STATUS BIT NAME
N/A
MEANING
7:4
Reserved
Reserved
3:0
CONFIG
Selected configuration to restore
FN8757 Rev.1.00
Jun 26, 2017
Page 48 of 54
ISL68137
Adaptive Voltage Scaling Bus (AVSBus) Functionality and Operation
The AVSBus interface provides a high speed (up to 50MHz) serial interface to the ISL68137, allowing implementation of advanced
voltage scaling functions that support increased system efficiency and performance. Devices equipped with AVSBus master capability
can use the interface to enable rapid supply voltage changes to support low power consumption modes as well as high performance
modes. Due to the advanced digital regulation loop employed, the ISL68137 is well equipped to support very rapid transition rates. All
commands are readable at all times, but they cannot be written unless the device is set to AVSBus control.
AVSBus Master Send Subframe
FUNCTION
Start Code R/W
Command Type
Command Code
Rail Select
Command Data
CRC
SIZE (bits)
2
2
1
4
4
16
3
01b
00b = Write data
and Commit
11b = Read Data
0b = AVSBus Data 0h = Target Rail Voltage
1h = Transition Rate
2h = Rail Current
3h = Temperature
4h = Voltage Reset
Eh = AVSBus Status
Fh = AVSBus Version
0h = Rail 0
1h = Rail 1
Fh = Broadcast
Read = FFh
Write = See “AVSBus
Command Detail” on
page 50
SETTING
AVSBus Slave Response Subframe
FUNCTION
Slave Ack
0b
Status Response
Command Data
Not used
CRC
SIZE (bits)
2
1
5
16
5
3
Bit 4 = VDONE. Sets to 1 when VOUT
target is reached
Bit 3 = Status alert. Sets to 1 if a bit in
AVSBus Status register (excluding from
VDONE) has set
Bit 2 = AVSBus control. Sets to 1 when
AVSBus control is enabled
Bits 1:0 = Not used
Write = FFh
Read = See “AVSBus
Command Detail” on
page 50
Not used
11111b
SETTING
0b
00b = Command
acknowledged, action taken
01b = Command
acknowledged, no action
10b = Bad CRC, no action
11b = Invalid request, no action
FN8757 Rev.1.00
Jun 26, 2017
Page 49 of 54
ISL68137
AVSBus Command Detail
TARGET RAIL VOLTAGE (0h)
Definition: Sets or reads the target rail voltage set point. 1mV per LSB. The initial set point is copied from the PMBus command
VOUT_COMMAND when AVSBus operation is selected.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: Value of PMBus VOUT_COMMAND
Units: mV
Equation: TARGET RAIL VOLTAGE = (Direct value)
Range: Limited to the PMBus command values of VOUT_MIN and VOUT_MAX
COMMAND
TARGET RAIL VOLTAGE (0h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Two’s Complement Integer
TRANSITION RATE (1h)
Definition: Sets or reads the rise and fall transition rates. 1mV/µs per LSB. The initial value matches PMBus transition rates until
updated through AVSBus.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: Value of PMBus VOUT_TRANSITION_RATE for rise and fall
Units: mV/µs
Equation: TRANSITION RATE = (Direct value)
COMMAND
TRANSITION RATE (1h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
N/A
N/A
Function
Default Value
Rise Transition Rate, Two’s Complement Integer
N/A
FN8757 Rev.1.00
Jun 26, 2017
N/A
N/A
N/A
N/A
N/A
N/A
Fall Transition Rate, Two’s Complement Integer
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Page 50 of 54
ISL68137
RAIL CURRENT (2h)
Definition: Returns the output current reading. 10mA per LSB. A filter is applied to this reading, and it is configurable in
PowerNavigator.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: A
Equation: RAIL CURRENT= (Direct value)/100
COMMAND
RAIL CURRENT (2h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Function
Two’s Complement Integer
TEMPERATURE (3h)
Definition: Returns the power stage temperature reading. 0.1°C per LSB. This value is copied from the READ_TEMPERATURE_1 PMBus
command.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: Read Only
Default Value: N/A
Units: °C
Equation: TEMPERATURE = (Direct value)/10
COMMAND
TEMPERATURE (3h)
Format
Direct
Bit Position
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Function
FN8757 Rev.1.00
Jun 26, 2017
Two’s Complement Integer
Page 51 of 54
ISL68137
VOLTAGE RESET (4h)
Definition: Sets TARGET RAIL VOLTAGE to match that of the VOUT_COMMAND PMBus command.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Bit Field
Type: Write Only
Default Value: 00h
Units: N/A
COMMAND
VOLTAGE RESET (4h)
Format
Bit Field
Bit Position
15
14
13
12
11
10
9
Access
W
W
W
W
W
W
W
Function
Default Value
8
7
6
5
4
3
2
1
0
W
W
W
W
W
W
W
W
W
0
0
0
0
0
0
0
Send all 0’s
0
0
0
0
0
0
0
0
0
AVSBUS STATUS (Eh)
Definition: Returns the device status. VDONE indicates that the VOUT setting target has been reached. OT Warn indicates that one or
more of the device’s temperature measurements has exceeded the over-temperature warning threshold set by the OT_WARN_LIMIT
PMBus command. The device sets the AVS_SDA line low to notify the host any time a bit in this register has been set.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Bit Field
Type: Read Only
Default Value: N/A
Units: N/A
COMMAND
AVSBUS STATUS (Eh)
Format
Bit Field
Bit Position
15
14
13
12
11:0
Access
R
R
R
R
R
Function
VDONE
Not Used
Not Used
OT Warn
Not Used
Default Value
N/A
0
0
N/A
0
AVSBUS VERSION (Fh)
Definition: Returns the version of the AVSBus specification to which the device is compliant. This device complies with Version 1.3.
Paged or Global: Global
Data Length in Bytes: 2
Data Format: Bit Field
Type: Read Only
Default Value: 00h
Units: N/A
FN8757 Rev.1.00
Jun 26, 2017
Page 52 of 54
ISL68137
Revision History
c
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please visit our website to make sure you have the latest revision.
DATE
REVISION
CHANGE
Jun 26, 2017
FN8757.1
Applied new header/footer.
Updated Figure 5 on page 9.
Updated “Enable (EN0 and EN1) Input High Level” spec on page 10, removed typical and added a min spec
of 2.55V.
Added “Enable (EN0 and EN1) Input Low Level” spec on page 10.
On page 12, changed from “SCL, SDA Input High/Low Threshold” to “SCL, SDA Input High Level” removed
typical and added Min spec of 1.55V.
Added “SCL, SDA Input Low Level” spec on page 12.
On pages 29 through 38, Updated the tables in the PMBus Command Detail section for the following
commands, changed from “Two’s Complement Integer” to “Unsigned Integer”.
- VOUT_COMMAND, VOUT_MAX, VOUT_MARGIN_HIGH, VOUT_MARGIN_LOW, VOUT_TRANSITION_RATE,
VOUT_DROOP,
VOUT_MIN, VOUT_OV_FAULT_LIMIT, VOUT_UV_FAULT_LIMIT, VIN_OV_FAULT_LIMIT,
VIN_UV_FAULT_LIMIT, IIN_OC_FAULT_LIMIT, TON_DELAY, TON_RISE, TOFF_DELAY, and TOFF_FALL
Updated “READ_PIN (97h)” on page 46 from Paged to Global.
Updated “STATUS_CML (7Eh)” on page 43, changed Bit 1 meaning to “A communication fault other than the
ones listed in this table has occurred.”
Updated “AVSBus Slave Response Subframe” on page 49. Bit numbers were off by one for the setting row.
Updated About Intersil verbiage.
Sept 27, 2016
FN8757.0
Initial Release
About Intersil
Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products
address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets.
For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com.
For a listing of definitions and abbreviations of common terms used in our documents, visit www.intersil.com/glossary.
You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask.
Reliability reports are also available from our website at www.intersil.com/support.
© Copyright Intersil Americas LLC 2016-2017. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN8757 Rev.1.00
Jun 26, 2017
Page 53 of 54
ISL68137
Package Outline Drawing
For the most recent package outline drawing, see L48.6x6B.
L48.6x6B
48 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 0, 9/09
4X 4.4
6.00
44X 0.40
A
B
6
PIN 1
INDEX AREA
6
PIN #1 INDEX AREA
48
37
1
6.00
36
4 .40 ± 0.15
25
12
0.15
(4X)
13
24
0.10 M C A B
0.05 M C
TOP VIEW
48X 0.45 ± 0.10
4 48X 0.20
BOTTOM VIEW
SEE DETAIL "X"
0.10 C
BASE PLANE
MAX 1.00
(
SEATING PLANE
0.08 C
( 44 X 0 . 40 )
( 5. 75 TYP )
C
SIDE VIEW
4. 40 )
C
0 . 2 REF
5
( 48X 0 . 20 )
( 48X 0 . 65 )
0 . 00 MIN.
0 . 05 MAX.
DETAIL "X"
TYPICAL RECOMMENDED LAND PATTERN
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3. Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
5. Tiebar shown (if present) is a non-functional feature.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
FN8757 Rev.1.00
Jun 26, 2017
Page 54 of 54