Vicor FPV1006-150-R 8v to 36vin cool-power zvs buck regulator family Datasheet

Cool-Power®
ZVS Switching Regulators
PI33xx-x0
8V to 36VIN Cool-Power ZVS Buck Regulator Family
Product Description
Features & Benefits
The PI33xx-x0 is a family of high efficiency, wide input range
DC‑DC ZVS-Buck regulators integrating controller, power
switches, and support components all within a high density
System-in-Package (SiP). The integration of a high performance
Zero-Voltage Switching (ZVS) topology, within the PI33xx-x0
series, increases point of load performance providing best in class
power efficiency. The PI33xx-x0 requires only an external inductor
and minimal capacitors to form a complete DC-DC switching
mode Buck Regulator.
• High Efficiency ZVS-Buck Topology
• Wide input voltage range of 8V to 36V
• Very-Fast transient response
• High accuracy pre-trimmed output voltage
• User adjustable soft-start & tracking
• Power-up into pre-biased load (select versions)
• Parallel capable with single wire current sharing
Device
Output Voltage
IOUT Max
Set
Range
PI3311-x0
1.0V
1.0 to 1.4V
10A
PI3318-x0
1.8V
1.4 to 2.0V
10A
PI3312-x0
2.5V
2.0 to 3.1V
10A
PI3301-x0
3.3V
2.3 to 4.1V
10A
PI3302-x0
5.0V
3.3 to 6.5V
10A
PI3303-x0
12V
6.5 to 13.0V
8A
PI3305-x0
15V
10.0 to 16.0V
8A
• Input Over/Undervoltage Lockout (OVLO/UVLO)
• Output Overvoltage Protection (OVP)
The ZVS architecture also enables high frequency operation
while minimizing switching losses and maximizing efficiency.
The high switching frequency operation reduces the size of the
external filtering components, improves power density, and
enables very fast dynamic response to line and load transients.
The PI33xx-x0 series sustains high switching frequency all the
way up to the rated input voltage without sacrificing efficiency
and, with its 20ns minimum on-time, supports large step down
conversions up to 36VIN.
• Overtemperature Protection (OTP)
• Fast and slow current limits
• -40°C to 125°C operating range (TJ)
• Optional I2C™ * functionality & programmability:
■■VOUT margining
■■Fault reporting
■■Enable and SYNCI pin polarity
■■Phase delay (interleaving multiple regulators)
Applications
• High efficiency systems
• High voltage battery operation
Package Information
• 10mm x 14mm x 2.6mm LGA SiP
* I2C™ is a trademark of NXP Semiconductors
Cool-Power® ZVS Switching Regulators
Page 1 of 41
Rev 2.5
06/2017
PI33xx-x0
Contents
Order Information
3
I2C™
3
Output Voltage Trim
34
Absolute Maximum Ratings
4
Soft-Start Adjust and Tracking
35
Functional Block Diagram
4
Inductor Pairing
36
Pin Description
5
Thermal Derating
36
Package Pin-Out
5
Filter Considerations
36
PI3311-x0-LGIZ (1.0VOUT ) Electrical Characteristics
6
Layout Guidelines
37
PI3318-x0-LGIZ (1.8VOUT ) Electrical Characteristics
9
Recommended PCB Footprint and Stencil
38
PI3312-x0-LGIZ (2.5VOUT ) Electrical Characteristics
12
LGIZ Package Drawing
39
PI3301-x0-LGIZ (3.3VOUT ) Electrical Characteristics
16
Revision History
40
PI3302-x0-LGIZ (5.0VOUT ) Electrical Characteristics
20
Warranty
41
PI3303-x0-LGIZ (12.0VOUT ) Electrical Characteristics
24
PI3305-x0-LGIZ (15.0VOUT ) Electrical Characteristics
28
Functional Description
32
Functionality & Programmability
ENABLE (EN)
32
Remote Sensing
32
Switching Frequency Synchronization
32
Soft-Start
32
Output Voltage Trim
32
Output Current Limit Protection
33
Input Undervoltage Lockout
33
Input Overvoltage Lockout
33
Output Overvoltage Protection
33
Overtemperature Protection
33
Pulse Skip Mode (PSM)
33
Variable Frequency Operation
33
Parallel Operation
33
I2C
34
Interface Operation
Cool-Power® ZVS Switching Regulators
Page 2 of 41
Application Description
Rev 2.5
06/2017
34
PI33xx-x0
Order Information
Output Range
IOUT Max
Package
Transport
Media
1.0 to 1.4V
10A
10mm x 14mm 123-pin LGA
TRAY
1.8V
1.4 to 2.0V
10A
10mm x 14mm 123-pin LGA
TRAY
2.5V
2.0 to 3.1V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3301-00-LGIZ
3.3V
2.3 to 4.1V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3302-00-LGIZ
5.0V
3.3 to 6.5V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3303-00-LGIZ
12V
6.5 to 13.0V
8A
10mm x 14mm 123-pin LGA
TRAY
PI3305-00-LGIZ
15V
10.0 to 16.0V
8A
10mm x 14mm 123-pin LGA
TRAY
IOUT Max
Package
Transport
Media
Cool-Power
Set
Range
PI3311-00-LGIZ
1.0V
PI3318-00-LGIZ
PI3312-00-LGIZ
I2C™ Functionality & Programmability
Cool-Power
Output Range
Set
Range
PI3311-20-LGIZ
1.0V
1.0 to 1.4V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3318-20-LGIZ
1.8V
1.4 to 2.0V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3312-20-LGIZ
2.5V
2.0 to 3.1V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3301-20-LGIZ
3.3V
2.3 to 4.1V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3302-20-LGIZ
5.0 V
3.3 to 6.5V
10A
10mm x 14mm 123-pin LGA
TRAY
PI3303-20-LGIZ
12V
6.5 to 13.0V
8A
10mm x 14mm 123-pin LGA
TRAY
PI3305-20-LGIZ
15V
10.0 to 16.0V
8A
10mm x 14mm 123-pin LGA
TRAY
Cool-Power® ZVS Switching Regulators
Page 3 of 41
Rev 2.5
06/2017
PI33xx-x0
Absolute Maximum Ratings
Name
Rating
VIN
-0.7 to 36V
VS1
-0.7 to 36VDC
SGND
100mA
PWRGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA, REM
-0.3V to 5.5V / 5mA
VOUT
PI3311-x0-LGIZ
-0.3V to 5.5V
PI3318-x0-LGIZ
-0.5V to 9V
PI3312-x0-LGIZ
-0.8V to 13V
PI3301-x0-LGIZ
-1.0V to 18V
PI3302-x0-LGIZ
-1.5V to 21V
PI3303-x0-LGIZ
-3.6V to 25V
PI3305-x0-LGIZ
-4.5V to 25V
Storage Temperature
-65°C to 150°C
Operating Junction Temperature
-40°C to 125°C
Soldering Temperature for 20 seconds
245°C
ESD Rating
2kV HBM
Notes: At 25°C ambient temperature. Stresses beyond these limits may cause permanent damage to the device. Operation at these conditions or conditions
beyond those listed in the Electrical Specifications table is not guaranteed. All voltage nodes are referenced to PGND unless otherwise noted. Test conditions
are per the specifications within the individual product electrical characteristics.
Functional Block Diagram
VIN
VOUT
Simplified Block Diagram (I2C™ pins SCL, SDA, ADR0, and ADR1 only active for PI33xx-20 device versions)
Cool-Power® ZVS Switching Regulators
Page 4 of 41
Rev 2.5
06/2017
PI33xx-x0
Pin Description
Pin Name
Number
Description
SGND
Block 1
Signal Ground: Internal logic ground for EA, TRK, SYNCI, SYNCO, ADJ and I2C (options) communication returns. SGND
and PGND are star connected within the regulator package.
PGND
Block 2
Power Ground: VIN and VOUT power returns.
VIN
Block 3
Input Voltage: and sense for UVLO, OVLO and feed forward ramp.
VOUT
Block 5
Output Voltage: and sense for power switches and feed-forward ramp.
VS1
Block 4
Switching Node: and ZVS sense for power switches.
PWRGD
A1
Power Good: High impedance when regulator is operating and VOUT is in regulation.
Otherwise pulls to SGND. Also can be used for parallel timing management intended for lead regulator.
EAO
A2
Error Amp Output: External connection for additional compensation and current sharing.
EN
A3
Enable Input: Regulator enable control. Asserted high or left floating – regulator enabled;
Asserted low, regulator output disabled. Polarity is programmable via I2C interface.
REM
A5
Remote Sense: High side connection. Connect to output regulation point.
ADJ
B1
Adjust Input: An external resistor may be connected between ADJ pin and SGND or VOUT
to trim the output voltage up or down.
TRK
C1
Soft-start and Track Input: An external capacitor may be connected between TRK pin
and SGND to decrease the rate of rise during soft-start.
NC
A4
No Connect: Leave pins floating.
VDR
K3
VDR can only be used for ADR0 and ADR1 pull up reference voltage.
No other external loading is permitted
SYNCO
K4
Synchronization Output: Outputs a low signal for ½ of the minimum period for synchronization of other converters.
SYNCI
K5
Synchronization Input: Synchronize to the falling edge of external clock frequency.
SYNCI is a high impedance digital input node and should always be connected to SGND when not in use.
SDA
D1
Data Line: Connect to SGND for PI33xx-00. For use with PI33xx-20 only.
SCL
E1
Clock Line: Connect to SGND for PI33xx-00. For use with PI33xx-20 only.
ADR1
H1
Tri-state Address: No connect for PI33xx-00. For use with PI33xx-20 only.
ADR0
G1
Tri-state Address: No connect for PI33xx-00. For use with PI33xx-20 only.
SYNCI
2
SYNCO
1
VDR
Package Pin-Out
3
4
5
6
7
PGND
Block 2
8
9
SGND K
Block 1
J
10
11
12
13
14
VIN
Block 3
Block 1:
B2-4, C2-4, D2-3, E2-3, F1-3, G2-3, H2-3, J1-3, K1-2
Block 2:
A8-10, B8-10, C8-10, D8-10, E4-10,
ADR1 H
F4-10, G4-10, H4-10, J4-10, K6-10
ADR0 G
SGND F
SCL E
Block 3:
G12-14, H12-14, J12-14, K12-14
Block 4:
A12-14, B12-14, C12-14, D12-14, E12-14
Block 5:
A6-7, B6-7, C6-7, D6-7
SDA D
TRK C
VS1
Block 4
ADJ B
PWRGD A
REM
NC
EN
EAO
VOUT
Block 5
Cool-Power® ZVS Switching Regulators
Page 5 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3311-x0-LGIZ (1.0VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 125nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
36
V
Input Specifications
Input Voltage
VIN_DC
Input Current
IIN_DC
Input Current At Output Short
(fault condition duty cycle)
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
VIN = 24V, TC = 25°C, IOUT =10A
476
[2]
mA
20
mA
Disabled
2.0
mA
Enabled (no load)
2.5
mA
1
V/μs
1.013
V
1.4
V
Output Specifications
Output Voltage Total Regulation
Output Voltage Trim Range
VOUT_DC
[2]
0.987
VOUT_DC
[3]
1.0
Line Regulation
∆VOUT (∆VIN)
@25°C, 8V < VIN < 36V
Load Regulation
∆VOUT (∆IOUT)
@25°C, 0.5A < IOUT < 10A
Output Voltage Ripple
VOUT_AC
IOUT = 5A, COUT = 8 x 100μF, 20MHz BW
Continuous Output
Current Range
IOUT_DC
[5] Minimum
Current Limit
IOUT_CL
1mA load required
[4]
1.0
0.10
%
0.10
%
20
mVp-p
0.001
10
12
A
A
Protection
VIN UVLO Start Threshold
VUVLO_START
7.10
7.60
8.00
V
VIN UVLO Stop Threshold
VUVLO_STOP
6.80
7.25
7.60
V
VIN UVLO Hysteresis
VUVLO_HYS
0.33
VIN OVLO Start Threshold
VOVLO_START
36.1
VIN OVLO Stop Threshold
VOVLO_STOP
37.0
VIN OVLO Hysteresis
V
V
38.4
V
VOVLO_HYS
0.77
V
VIN UVLO/OVLO Response Time
tf
500
ns
Output Overvoltage Protection
VOVP
20
%
Overtemperature
Fault Threshold
TOTP
Overtemperature
Restart Hysteresis
TOTP_HYS
Above VOUT
130
135
30
[1]
140
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
Cool-Power® ZVS Switching Regulators
Page 6 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3311-x0-LGIZ (1.0VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 125nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
[6]
tFR_DLY
500
kHz
30
ms
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNCI
SYNCI Threshold
VSYNCI
2.5
V
SYNCI Input Impedance
ZSYNCI
100
kΩ
Relative to set switching frequency [3]
50
110
%
Sync Out (SYNCO)
SYNCO High
VSYNCO_HI
Source 1mA
4.5
V
SYNCO Low
VSYNCO_LO
Sink 1mA
SYNCO Rise Time
tSYNCO_RT
20pF load
10
ns
SYNCO Fall Time
tSYNCO_FT
20pF load
10
ns
0.5
V
Soft Start And Tracking
TRK Active Input Range
VTRK
Internal reference tracking range
0
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
1.04
1.2
V
V
VTRK_OV
20
40
60
mV
ITRK
70
50
30
μA
ITRK_DIS
VTRK = 0.5V
6.8
mA
tSS
CTRK = 0µF
2.2
ms
Enable
High Threshold
VEN_HI
0.9
1
1.1
V
Low Threshold
VEN_LO
0.7
0.8
0.9
V
Threshold Hysteresis
VEN_HYS
100
200
300
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
With positive logic EN polarity
2
V
Enable Pull-Down Voltage
(Floating)
VEN_PD
With negative logic EN polarity
0
V
Source Current
IEN_SO
With positive logic EN polarity
50
μA
Sink Current
IEN_SK
With negative logic EN polarity
50
μA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
Cool-Power® ZVS Switching Regulators
Page 7 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3311-x0-LGIZ (1.0VOUT) Electrical Characteristics (Cont.)
100
95
Efficiency
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 1 — Efficiency at 25°C
Figure 4 — Transient Response 2A to 7A, at 5A/µs
Figure 2 — Short Circuit Test
Figure 5 — Output Ripple 24VIN, 1.0VOUT at 10A
600
Frequency (kHz)
500
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 3 — Switching Frequency vs. Load Current
Cool-Power® ZVS Switching Regulators
Page 8 of 41
Figure 6 — Output Ripple 24VIN, 1.0VOUT at 5A
Rev 2.5
06/2017
PI33xx-x0
PI3318-x0-LGIZ (1.8VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 155nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
36
V
Input Specifications
Input Voltage
VIN_DC
Input Current
IIN_DC
Input Current At Output Short
(fault condition duty cycle)
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
VIN = 24V, TC = 25°C, IOUT =10A
835
[2]
mA
20
mA
Disabled
2.0
mA
Enabled (no load)
2.5
mA
1
V/μs
1.827
V
2.0
V
Output Specifications
Output Voltage Total Regulation
Output Voltage Trim Range
VOUT_DC
[2]
1.773
VOUT_DC
[3]
1.4
Line Regulation
∆VOUT (∆VIN)
@25°C, 8V < VIN < 36V
Load Regulation
∆VOUT (∆IOUT)
@25°C, 0.5A < IOUT < 10A
Output Voltage Ripple
VOUT_AC
IOUT = 5A, COUT = 6 x 100μF, 20MHz BW
Continuous Output
Current Range
IOUT_DC
[5]
Current Limit
IOUT_CL
Minimum 1mA load required
[4]
1.8
0.10
%
0.10
%
25
mVp-p
0.001
10
12
A
A
Protection
VIN UVLO Start Threshold
VUVLO_START
7.10
7.60
8.00
V
VIN UVLO Stop Threshold
VUVLO_STOP
6.80
7.25
7.60
V
VIN UVLO Hysteresis
VUVLO_HYS
0.33
VIN OVLO Start Threshold
VOVLO_START
36.1
VIN OVLO Stop Threshold
VOVLO_STOP
37.0
VIN OVLO Hysteresis
V
V
38.4
V
VOVLO_HYS
0.77
V
VIN UVLO/OVLO Response Time
tf
500
ns
Output Overvoltage Protection
VOVP
20
%
Overtemperature
Fault Threshold
TOTP
Overtemperature
Restart Hysteresis
TOTP_HYS
Above VOUT
130
135
30
[1]
140
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
Cool-Power® ZVS Switching Regulators
Page 9 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3318-x0-LGIZ (1.8VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 155nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
[6]
tFR_DLY
600
kHz
30
ms
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNCI
SYNCI Threshold
VSYNCI
2.5
V
SYNCI Input Impedance
ZSYNCI
100
kΩ
Relative to set switching frequency [3]
50
110
%
Sync Out (SYNCO)
SYNCO High
VSYNCO_HI
Source 1mA
4.5
V
SYNCO Low
VSYNCO_LO
Sink 1mA
SYNCO Rise Time
tSYNCO_RT
20pF load
10
ns
SYNCO Fall Time
tSYNCO_FT
20pF load
10
ns
0.5
V
Soft Start And Tracking
TRK Active Input Range
VTRK
Internal reference tracking range
0
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
1.04
1.2
V
V
VTRK_OV
20
40
60
mV
ITRK
70
50
30
μA
ITRK_DIS
VTRK = 0.5V
6.8
mA
tSS
CTRK = 0µF
2.2
ms
Enable
High Threshold
VEN_HI
0.9
1
1.1
V
Low Threshold
VEN_LO
0.7
0.8
0.9
V
Threshold Hysteresis
VEN_HYS
100
200
300
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
With positive logic EN polarity
2
V
Enable Pull-Down Voltage
(Floating)
VEN_PD
With negative logic EN polarity
0
V
Source Current
IEN_SO
With positive logic EN polarity
50
μA
Sink Current
IEN_SK
With negative logic EN polarity
50
μA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
Cool-Power® ZVS Switching Regulators
Page 10 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3318-x0-LGIZ (1.8VOUT) Electrical Characteristics (Cont.)
100
95
Efficiency
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 8V
VIN = 12V
VIN = 24V
VIN = 36V
Figure 7 — Efficiency at 25°C
Figure 10 — Transient Response 2A to 7A, at 5A/µs
Figure 8 — Short Circuit Test
Figure 11 — Output Ripple 24VIN, 1.8VOUT at 10A
700
Frequency (kHz)
600
500
400
300
200
100
0
1
2
VIN:
3
4
5
6
7
Load Current (A)
8V
12V
24V
Figure 9 — Switching Frequency vs. Load Current
Cool-Power® ZVS Switching Regulators
Page 11 of 41
8
9
10
36V
Figure 12 — Output Ripple 24VIN, 1.8VOUT at 5A
Rev 2.5
06/2017
PI33xx-x0
PI3312-x0-LGIZ (2.5VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
36
V
Input Specifications
Input Voltage
VIN_DC
[7]
Input Current
IIN_DC
VIN = 24V, TC = 25°C, IOUT = 10A
Input Current At Output Short
(fault condition duty cycle)
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
1.14
[2]
A
20
mA
Disabled
2.0
mA
Enabled (no load)
2.5
mA
1
V/μs
Output Specifications
Output Voltage Total Regulation
Output Voltage Trim Range
VOUT_DC
[2]
VOUT_DC
[3] [7]
Line Regulation
∆VOUT (∆VIN)
@25°C, 8V < VIN < 36V
Load Regulation
∆VOUT (∆IOUT)
@25°C, 0.5A < IOUT < 10A
Output Voltage Ripple
VOUT_AC
IOUT = 5A, COUT = 4 x 100μF, 20MHz BW
Continuous Output
Current Range
IOUT_DC
[5] [7]
Current Limit
IOUT_CL
2.465
2.500
2.535
V
2.0
2.5
3.1
V
[4]
0.10
%
0.10
%
28
mVp-p
10
12
A
A
Protection
VIN UVLO Start Threshold
VUVLO_START
7.10
7.60
8.00
V
VIN UVLO Stop Threshold
VUVLO_STOP
6.80
7.25
7.60
V
VIN UVLO Hysteresis
VUVLO_HYS
0.33
VIN OVLO Start Threshold
VOVLO_START
36.1
VIN OVLO Stop Threshold
VOVLO_STOP
37.0
VIN OVLO Hysteresis
V
V
38.4
V
VOVLO_HYS
0.77
V
VIN UVLO/OVLO Response Time
tf
500
ns
Output Overvoltage Protection
VOVP
20
%
Overtemperature
Fault Threshold
TOTP
Overtemperature
Restart Hysteresis
TOTP_HYS
Above VOUT
130
135
30
[1]
140
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 12 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3312-x0-LGIZ (2.5VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
[6]
tFR_DLY
500
kHz
30
ms
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNCI
SYNCI Threshold
VSYNCI
2.5
V
SYNCI Input Impedance
ZSYNCI
100
kΩ
Relative to set switching frequency [3]
50
110
%
Sync Out (SYNCO)
SYNCO High
VSYNCO_HI
Source 1mA
4.5
V
SYNCO Low
VSYNCO_LO
Sink 1mA
SYNCO Rise Time
tSYNCO_RT
20pF load
10
ns
SYNCO Fall Time
tSYNCO_FT
20pF load
10
ns
0.5
V
Soft Start And Tracking
TRK Active Input Range
VTRK
Internal reference tracking range
0
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
1.04
1.2
V
V
VTRK_OV
20
40
60
mV
ITRK
70
50
30
μA
ITRK_DIS
VTRK = 0.5V
6.8
mA
tSS
CTRK = 0µF
2.2
ms
Enable
High Threshold
VEN_HI
0.9
1
1.1
V
Low Threshold
VEN_LO
0.7
0.8
0.9
V
Threshold Hysteresis
VEN_HYS
100
200
300
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
With positive logic EN polarity
2
V
Enable Pull-Down Voltage
(Floating)
VEN_PD
With negative logic EN polarity
0
V
Source Current
IEN_SO
With positive logic EN polarity
50
μA
Sink Current
IEN_SK
With negative logic EN polarity
50
μA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 13 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3312-x0-LGIZ (2.5VOUT) Electrical Characteristics (Cont.)
95
90
Efficiency
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 13 — Efficiency at 25°C
Figure 16 — Transient Response 5A to 10A, at 5A/µs
Figure 14 — Short Circuit Test
Figure 17 — Output Ripple 24VIN, 2.5VOUT at 10A
600
Frequency (kHz)
500
400
300
200
100
0
1
2
3
VIN:
4
5
6
7
8
Load Current (A)
12V
24V
10
36V
Figure 15 — Switching Frequency vs. Load Current
Cool-Power® ZVS Switching Regulators
Page 14 of 41
9
Figure 18 — Output Ripple 24VIN, 2.5VOUT at 5A
Rev 2.5
06/2017
PI33xx-x0
PI3312-x0-LGIZ (2.5VOUT) Electrical Characteristics (Cont.)
12
Load Current (A)
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 19 — Load Current vs. Ambient Temperature, 0LFM
12
Load Current (A)
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 20 — Load Current vs. Ambient Temperature, 200LFM
Load Current (A)
12
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 21 — Load Current vs. Ambient Temperature, 400LFM
Cool-Power® ZVS Switching Regulators
Page 15 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3301-x0-LGIZ (3.3VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
36
V
Input Specifications
Input Voltage
VIN_DC
[7]
Input Current
IIN_DC
VIN = 24V, TC = 25°C, IOUT =10A
Input Current At Output Short
(fault condition duty cycle)
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
1.49
[2]
A
20
mA
Disabled
2.0
mA
Enabled (no load)
2.5
mA
1
V/μs
Output Specifications
Output Voltage Total Regulation
Output Voltage Trim Range
VOUT_DC
[2]
VOUT_DC
[3] [7]
Line Regulation
∆VOUT (∆VIN)
@25°C, 8V < VIN < 36V
Load Regulation
∆VOUT (∆IOUT)
@25°C, 0.5A < IOUT < 10A
Output Voltage Ripple
VOUT_AC
IOUT = 5A, COUT = 4 x 100μF, 20MHz BW
Continuous Output
Current Range
IOUT_DC
[5]
Current Limit
IOUT_CL
3.25
3.30
3.36
V
2.3
3.3
4.1
V
[4]
0.10
%
0.10
%
37.5
mVp-p
10
12
A
A
Protection
VIN UVLO Start Threshold
VUVLO_START
7.10
7.60
8.00
V
VIN UVLO Stop Threshold
VUVLO_STOP
6.80
7.25
7.60
V
VIN UVLO Hysteresis
VUVLO_HYS
0.33
VIN OVLO Start Threshold
VOVLO_START
36.1
VIN OVLO Stop Threshold
VOVLO_STOP
37.0
VIN OVLO Hysteresis
V
V
38.4
V
VOVLO_HYS
0.77
V
VIN UVLO/OVLO Response Time
tf
500
ns
Output Overvoltage Protection
VOVP
20
%
Overtemperature
Fault Threshold
TOTP
Overtemperature
Restart Hysteresis
TOTP_HYS
Above VOUT
130
135
30
[1]
140
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 16 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3301-x0-LGIZ (3.3VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
[6]
tFR_DLY
650
kHz
30
ms
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNCI
SYNCI Threshold
VSYNCI
2.5
V
SYNCI Input Impedance
ZSYNCI
100
kΩ
Relative to set switching frequency [3]
50
110
%
Sync Out (SYNCO)
SYNCO High
VSYNCO_HI
Source 1mA
4.5
V
SYNCO Low
VSYNCO_LO
Sink 1mA
SYNCO Rise Time
tSYNCO_RT
20pF load
10
ns
SYNCO Fall Time
tSYNCO_FT
20pF load
10
ns
0.5
V
Soft Start And Tracking
TRK Active Input Range
VTRK
Internal reference tracking range
0
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
1.04
1.2
V
V
VTRK_OV
20
40
60
mV
ITRK
70
50
30
μA
ITRK_DIS
VTRK = 0.5V
6.8
mA
tSS
CTRK = 0µF
2.2
ms
Enable
High Threshold
VEN_HI
0.9
1
1.1
V
Low Threshold
VEN_LO
0.7
0.8
0.9
V
Threshold Hysteresis
VEN_HYS
100
200
300
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
With positive logic EN polarity
2
V
Enable Pull-Down Voltage
(Floating)
VEN_PD
With negative logic EN polarity
0
V
Source Current
IEN_SO
With positive logic EN polarity
50
μA
Sink Current
IEN_SK
With negative logic EN polarity
50
μA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 17 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3301-x0-LGIZ (3.3VOUT) Electrical Characteristics (Cont.)
100
95
Efficiency
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 22 — Efficiency at 25°C
Figure 25 — Transient Response 2A to 7A, at 5A/µs
Figure 23 — Short Circuit Test
Figure 26 — Output Ripple 24VIN, 3.3VOUT at 10A
700
Frequency (kHz)
600
500
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 24 — Switching Frequency vs. Load Current
Cool-Power® ZVS Switching Regulators
Page 18 of 41
Figure 27 — Output Ripple 24VIN, 3.3VOUT at 5A
Rev 2.5
06/2017
PI33xx-x0
PI3301-x0-LGIZ (3.3VOUT) Electrical Characteristics (Cont.)
12
Load Current (A)
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 28 — Load Current vs. Ambient Temperature, 0LFM
Load Current (A)
12
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 29 — Load Current vs. Ambient Temperature, 200LFM
12
Load Current (A)
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 30 — Load Current vs. Ambient Temperature, 400LFM
Cool-Power® ZVS Switching Regulators
Page 19 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3302-x0-LGIZ (5.0VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
8
24
36
V
Input Specifications
Input Voltage
VIN_DC
[7]
Input Current
IIN_DC
VIN = 24V, TC = 25°C, IOUT =10A
Input Current At Output Short
(fault condition duty cycle)
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
2.23
[2]
A
20
mA
Disabled
2.0
mA
Enabled (no load)
2.5
mA
1
V/μs
5.07
V
6.5
V
Output Specifications
Output Voltage Total Regulation
Output Voltage Trim Range
VOUT_DC
[2]
VOUT_DC
[3] [7]
4.93
5.00
3.3
Line Regulation
∆VOUT (∆VIN)
@25°C, 8V <VIN < 36V
Load Regulation
∆VOUT (∆IOUT)
@25°C, 0.5A <IOUT < 10A
Output Voltage Ripple
VOUT_AC
IOUT = 5A, COUT = 4 x 47μF, 20MHz BW
Continuous Output
Current Range
IOUT_DC
[5] [7]
Current Limit
IOUT_CL
[4]
0.10
%
0.10
%
30
mVp-p
10
12
A
A
Protection
VIN UVLO Start Threshold
VUVLO_START
7.10
7.60
8.00
V
VIN UVLO Stop Threshold
VUVLO_STOP
6.80
7.25
7.60
V
VIN UVLO Hysteresis
VUVLO_HYS
0.33
VIN OVLO Start Threshold
VOVLO_START
36.1
VIN OVLO Stop Threshold
VOVLO_STOP
37.0
VIN OVLO Hysteresis
V
V
38.4
V
VOVLO_HYS
0.77
V
VIN UVLO/OVLO Response Time
tf
500
ns
Output Overvoltage Protection
VOVP
20
%
Overtemperature
Fault Threshold
TOTP
Overtemperature
Restart Hysteresis
TOTP_HYS
Above VOUT
130
135
30
[1]
140
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 20 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3302-x0-LGIZ (5.0VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 200nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
[6]
tFR_DLY
1.0
MHz
30
ms
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNCI
SYNCI Threshold
VSYNCI
2.5
V
SYNCI Input Impedance
ZSYNCI
100
kΩ
Relative to set switching frequency [3]
50
110
%
Sync Out (SYNCO)
SYNCO High
VSYNCO_HI
Source 1mA
4.5
V
SYNCO Low
VSYNCO_LO
Sink 1mA
SYNCO Rise Time
tSYNCO_RT
20pF load
10
ns
SYNCO Fall Time
tSYNCO_FT
20pF load
10
ns
0.5
V
Soft Start And Tracking
TRK Active Input Range
VTRK
0
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
1.04
1.2
V
V
VTRK_OV
20
40
60
mV
ITRK
70
50
30
μA
ITRK_DIS
VTRK = 0.5V
6.8
mA
tSS
CTRK = 0µF
2.2
ms
Enable
High Threshold
VEN_HI
0.9
1
1.1
V
Low Threshold
VEN_LO
0.7
0.8
0.9
V
Threshold Hysteresis
VEN_HYS
100
200
300
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
With positive logic EN polarity
2
V
Enable Pull-Down Voltage
(Floating)
VEN_PD
With negative logic EN polarity
0
V
Source Current
IEN_SO
With positive logic EN polarity
50
μA
Sink Current
IEN_SK
With negative logic EN polarity
50
μA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 21 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3302-x0-LGIZ (5.0VOUT) Electrical Characteristics (Cont.)
100
95
Efficiency
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 31 — Efficiency at 25°C
Figure 34 — Transient Response 2A to 7A, at 5A/µs
Figure 32 — Short Circuit Test
Figure 35 — Output Ripple 24VIN, 5.0VOUT at 10A
1.2
Frequency (MHz)
1.0
0.8
0.6
0.4
0.2
0.0
1
2
3
4
5
6
7
8
9
10
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 33 — Switching Frequency vs. Load Current
Cool-Power® ZVS Switching Regulators
Page 22 of 41
Figure 36 — Output Ripple 24VIN, 5.0VOUT at 5A
Rev 2.5
06/2017
PI33xx-x0
PI3302-x0-LGIZ (5.0VOUT) Electrical Characteristics (Cont.)
12
Load Current (A)
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 37 — Load Current vs. Ambient Temperature, 0LFM
12
Load Current (A)
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 36V
VIN = 24V
Figure 38 — Load Current vs. Ambient Temperature, 200LFM
12
Load Current (A)
10
8
6
4
2
0
50
75
125
100
Ambient Temperature (°C)
VIN = 8V
VIN = 24V
VIN = 36V
Figure 39 — Load Current vs. Ambient Temperature, 400LFM
Cool-Power® ZVS Switching Regulators
Page 23 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3303-x0-LGIZ (12.0VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 230nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
17.4
24
36
V
Input Specifications
Input Voltage
VIN_DC
[7]
Input Current
IIN_DC
VIN = 24V, TC = 25°C, IOUT = 8A
Input Current At Output Short
(fault condition duty cycle)
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
4.15
[2]
A
20
mA
Disabled
2.0
mA
Enabled (no load)
2.5
mA
1
V/μs
Output Specifications
Output Voltage Total Regulation
Output Voltage Trim Range
VOUT_DC
[2]
VOUT_DC
[3] [7]
Line Regulation
∆VOUT (∆VIN)
@25°C, 8V < VIN < 36V
Load Regulation
∆VOUT (∆IOUT)
@25°C, 0.5A < IOUT < 8A
Output Voltage Ripple
VOUT_AC
IOUT = 4A, COUT = 4 x 22μF, 20MHz BW
Continuous Output
Current Range
IOUT_DC
[5]
Current Limit
IOUT_CL
11.82
12.0
12.18
V
6.5
12
13.0
V
[4]
0.10
%
0.10
%
60
mVp-p
8
9
A
A
Protection
VIN UVLO Start Threshold
VUVLO_START
15.80
16.60
17.40
V
VIN UVLO Stop Threshold
VUVLO_STOP
15.00
15.80
16.60
V
VIN UVLO Hysteresis
VUVLO_HYS
0.77
VIN OVLO Start Threshold
VOVLO_START
36.1
VIN OVLO Stop Threshold
VOVLO_STOP
37.0
VIN OVLO Hysteresis
V
V
38.4
V
VOVLO_HYS
0.77
V
VIN UVLO/OVLO Response Time
tf
500
ns
Output Overvoltage Protection
VOVP
20
%
Overtemperature
Fault Threshold
TOTP
Overtemperature
Restart Hysteresis
TOTP_HYS
Above VOUT
130
135
30
[1]
140
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 24 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3303-x0-LGIZ (12.0VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 230nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
[6]
tFR_DLY
1.4
MHz
30
ms
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNCI
SYNCI Threshold
VSYNCI
2.5
V
SYNCI Input Impedance
ZSYNCI
100
kΩ
Relative to set switching frequency [3]
50
110
%
Sync Out (SYNCO)
SYNCO High
VSYNCO_HI
Source 1mA
4.5
V
SYNCO Low
VSYNCO_LO
Sink 1mA
SYNCO Rise Time
tSYNCO_RT
20pF load
10
ns
SYNCO Fall Time
tSYNCO_FT
20pF load
10
ns
0.5
V
Soft Start And Tracking
TRK Active Input Range
VTRK
0
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
1.04
1.2
V
V
VTRK_OV
20
40
60
mV
ITRK
70
50
30
μA
ITRK_DIS
VTRK = 0.5V
6.8
mA
tSS
CTRK = 0µF
2.2
ms
Enable
High Threshold
VEN_HI
0.9
1
1.1
V
Low Threshold
VEN_LO
0.7
0.8
0.9
V
Threshold Hysteresis
VEN_HYS
100
200
300
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
With positive logic EN polarity
2
V
Enable Pull-Down Voltage
(Floating)
VEN_PD
With negative logic EN polarity
0
V
Source Current
IEN_SO
With positive logic EN polarity
50
μA
Sink Current
IEN_SK
With negative logic EN polarity
50
μA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 25 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3303-x0-LGIZ (12.0VOUT) Electrical Characteristics (Cont.)
100
95
Efficiency
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
Load Curent (A)
VIN = 17.4V
VIN = 24V
VIN = 36V
Figure 40 — Efficiency at 25°C
Figure 43 — Transient Response 4A to 8A, at 5A/µs
Figure 41 — Short Circuit Test
Figure 44 — Output Ripple 24VIN, 12.0VOUT at 8A
1.6
Frequency (MHz)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1
2
3
VIN = 17.4V
4
5
Load Curent (A)
6
VIN = 24V
Figure 42 — Switching Frequency vs. Load Current
Cool-Power® ZVS Switching Regulators
Page 26 of 41
7
8
VIN = 36V
Figure 45 — Output Ripple 24VIN, 12.0VOUT at 4A
Rev 2.5
06/2017
PI33xx-x0
PI3303-x0-LGIZ (12.0VOUT) Electrical Characteristics (Cont.)
9.0
Load Current (A)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
VIN = 18V
VIN = 24V
VIN = 36V
Figure 46 — Load Current vs. Ambient Temperature, 0LFM
9.0
Load Current (A)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
VIN = 18V
VIN = 24V
VIN = 36V
Figure 47 — Load Current vs. Ambient Temperature, 200LFM
9.0
Load Current (A)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
VIN = 18V
VIN = 24V
VIN = 36V
Figure 48 — Load Current vs. Ambient Temperature, 400LFM
Cool-Power® ZVS Switching Regulators
Page 27 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3305-x0-LGIZ (15.0VOUT) Electrical Characteristics
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 230nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
20.4
24
36
V
Input Specifications
Input Voltage
VIN_DC
[7]
Input Current
IIN_DC
VIN = 24V, TC = 25°C, IOUT = 8A
Input Current At Output Short
(fault condition duty cycle)
IIN_Short
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
5.15
[2]
A
20
mA
Disabled
2.0
mA
Enabled (no load)
2.5
mA
1
V/μs
Output Specifications
Output Voltage Total Regulation
Output Voltage Trim Range
VOUT_DC
[2]
VOUT_DC
[3] [7]
Line Regulation
∆VOUT (∆VIN)
@25°C, 8V < VIN < 36V
Load Regulation
∆VOUT (∆IOUT)
@25°C, 0.5A < IOUT < 8A
Output Voltage Ripple
VOUT_AC
IOUT = 4A, COUT = 4 x 22μF, 20MHz BW
Continuous Output
Current Range
IOUT_DC
[5] [7]
Current Limit
IOUT_CL
14.78
15.0
15.23
V
10.0
15
16
V
[4]
0.1
%
0.1
%
60
mVp-p
8
9
A
A
Protection
VIN UVLO Start Threshold
VUVLO_START
18.4
19.4
20.4
V
VIN UVLO Stop Threshold
VUVLO_STOP
17.4
18.4
19.4
V
VIN UVLO Hysteresis
VUVLO_HYS
0.90
VIN OVLO Start Threshold
VOVLO_START
36.1
VIN OVLO Stop Threshold
VOVLO_STOP
37.0
VIN OVLO Hysteresis
V
V
38.4
V
VOVLO_HYS
0.77
V
VIN UVLO/OVLO Response Time
tf
500
ns
Output Overvoltage Protection
VOVP
20
%
Overtemperature
Fault Threshold
TOTP
Overtemperature
Restart Hysteresis
TOTP_HYS
Above VOUT
130
135
30
[1]
140
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 28 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3305-x0-LGIZ (15.0VOUT) Electrical Characteristics (Cont.)
Unless otherwise specified: -40°C < TJ < 125°C, VIN = 24V, L1 = 230nH [1]
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
[6]
tFR_DLY
1.5
MHz
30
ms
Sync In (SYNCI)
Synchronization Frequency Range
∆fSYNCI
SYNCI Threshold
VSYNCI
2.5
V
SYNCI Input Impedance
ZSYNCI
100
kΩ
Relative to set switching frequency [3]
50
110
%
Sync Out (SYNCO)
SYNCO High
VSYNCO_HI
Source 1mA
4.5
V
SYNCO Low
VSYNCO_LO
Sink 1mA
SYNCO Rise Time
tSYNCO_RT
20pF load
10
ns
SYNCO Fall Time
tSYNCO_FT
20pF load
10
ns
0.5
V
Soft Start And Tracking
TRK Active Input Range
VTRK
0
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft – Start)
Discharge Current (Fault)
Soft-Start Time
1.04
1.2
V
V
VTRK_OV
20
40
60
mV
ITRK
70
50
30
μA
ITRK_DIS
VTRK = 0.5V
6.8
mA
tSS
CTRK = 0µF
2.2
ms
Enable
High Threshold
VEN_HI
0.9
1
1.1
V
Low Threshold
VEN_LO
0.7
0.8
0.9
V
Threshold Hysteresis
VEN_HYS
100
200
300
mV
Enable Pull-Up Voltage
(Floating)
VEN_PU
With positive logic EN polarity
2
V
Enable Pull-Down Voltage
(Floating)
VEN_PD
With negative logic EN polarity
0
V
Source Current
IEN_SO
With positive logic EN polarity
50
μA
Sink Current
IEN_SK
With negative logic EN polarity
50
μA
[1]
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
[2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
[3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or V
OUT is modified.
[4] Refer to Output Ripple plots.
[5] Refer to Load Current vs. Ambient Temperature curves.
[6] Refer to Switching Frequency vs. Load current curves.
[7] Minimum 5V between V -V
IN OUT must be maintained or a minimum load of 1mA required.
Cool-Power® ZVS Switching Regulators
Page 29 of 41
Rev 2.5
06/2017
PI33xx-x0
PI3305-x0-LGIZ (15.0VOUT) Electrical Characteristics (Cont.)
100
95
Efficiency
90
85
80
75
70
65
60
55
50
0
1
2
3
4
5
6
7
8
Load Curent (A)
VIN = 12V
VIN = 24V
VIN = 36V
Figure 49 — Efficiency at 25°C
Figure 52 — Transient Response 2A to 6A, at 5A/µs
Figure 50 — Short Circuit Test
Figure 53 — Output Ripple 24VIN, 15.0VOUT at 8A
1.6
Frequency (MHz)
1.4
1.2
1.0
20.4VIN
24VIN
36VIN
0.8
0.6
0.4
0.2
0.0
1
2
3
VIN = 20.4V
4
5
Load Curent (A)
VIN = 24V
6
7
VIN = 36V
Figure 51 — Switching Frequency vs. Load Current
Cool-Power® ZVS Switching Regulators
Page 30 of 41
8
Figure 54 — Output Ripple 24VIN, 15.0VOUT at 4A
Rev 2.5
06/2017
PI33xx-x0
PI3305-x0-LGIZ (15.0VOUT) Electrical Characteristics (Cont.)
9.0
Load Current (A)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
VIN = 21V
VIN = 36V
VIN = 24V
Figure 55 — Load Current vs. Ambient Temperature, 0LFM
9.0
Load Current (A)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
VIN = 21V
VIN = 24V
VIN = 36V
Figure 56 — Load Current vs. Ambient Temperature, 200LFM
9.0
Load Current (A)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
50
75
100
125
Ambient Temperature (°C)
VIN = 21V
VIN = 24V
VIN = 36V
Figure 57 — Load Current vs. Ambient Temperature, 400LFM
Cool-Power® ZVS Switching Regulators
Page 31 of 41
Rev 2.5
06/2017
PI33xx-x0
Functional Description
Switching Frequency Synchronization
The PI33xx-x0 is a family of highly integrated ZVS-Buck regulators.
The PI33xx-x0 has a set output voltage that is trimmable within
a prescribed range shown in Table 1. Performance and maximum
output current are characterized with a specific external power
inductor (see Table 4).
The PI33xx-x0 default for SYNCI is to sync with respect to the
falling edge of the applied clock providing 180° phase shift from
SYNCO. This allows for the paralleling of two PI33xx-x0 devices
without the need for further user programming or external sync
clock circuitry. The user can change the SYNCI polarity to sync
with the external clock rising edge via the I2C data bus (PI33xx-20
device versions only).
L1
VIN
VIN
CIN
PGND
VS1
PI33xx
VOUT
VOUT
COUT
REM
SYNCI
TRK
ADJ
EN
EAO
SGND
SYNCO
The SYNCI input allows the user to synchronize the controller
switching frequency by an external clock referenced to SGND.
The external clock can synchronize the unit between 50% and
110% of the preset switching frequency (fS). For PI33xx-20
device versions only, the phase delay can be programmed via I2C
bus with respect to the clock applied at SYNCI pin. Phase delay
allows PI33xx-20 regulators to be paralleled and operate in an
interleaving mode.
When using the internal oscillator, the SYNCO pin provides a
5V clock that can be used to sync other regulators. Therefore,
one PI33xx-x0 can act as the lead regulator and have additional
PI33xx-x0s running in parallel and interleaved.
Soft-Start
The PI33xx-x0 includes an internal soft-start capacitor to ramp the
output voltage in 2ms from 0V to full output voltage. Connecting
an external capacitor from the TRK pin to SGND will increase the
start-up ramp period. See, “Soft Start Adjustment and Track,” in
the Applications Description section for more details.
Figure 58 — ZVS-Buck with required components
For basic operation, Figure 58 shows the connections and
components required. No additional design or settings
are required.
Output Voltage Trim
ENABLE (EN)
EN is the enable pin of the converter. The EN Pin is referenced
to SGND and permits the user to turn the regulator on or off.
The EN default polarity is a positive logic assertion. If the EN pin
is left floating or asserted high, the converter output is enabled.
Pulling EN pin below 0.8VDC with respect to SGND will disable the
regulator output.
The PI33xx-x0 output voltage can be trimmed up from the preset
output by connecting a resistor from ADJ pin to SGND and can be
trimmed down by connecting a resistor from ADJ pin to VOUT. The
Table 1 defines the voltage ranges for the PI33xx-x0 family.
Device
The EN input polarity can be programmed (PI33xx-20 device
versions only) via the I2C™ data bus. When the EN pin polarity is
programmed for negative logic assertion; and if the EN pin is left
floating, the regulator output is enabled. Pulling the EN pin above
1.0VDC with respect to SGND, will disable the regulator output.
Remote Sensing
An internal 100Ω resistor is connected between REM pin and
VOUT pin to provide regulation when the REM connection is
broken. Referring to Figure 58, it is important to note that L1 and
COUT are the output filter and the local sense point for the power
supply output. As such, the REM pin should be connected at COUT
as the default local sense connection unless remote sensing to
compensate additional distribution losses in the system. The REM
pin should not be left floating.
Cool-Power® ZVS Switching Regulators
Page 32 of 41
Output Voltage
Set
Range
PI3311-x0-LGIZ
1.0V
1.0 to 1.4V
PI3318-x0-LGIZ
1.8V
1.4 to 2.0V
PI3312-x0-LGIZ
2.5V
2.0 to 3.1V
PI3301-x0-LGIZ
3.3V
2.3 to 4.1V
PI3302-x0-LGIZ
5.0V
3.3 to 6.5V
PI3303-x0-LGIZ
12V
6.5 to 13.0V
PI3305-x0-LGIZ
15V
10.0 to 16.0V
Table 1 — PI33xx-x0 family output voltage range
Rev 2.5
06/2017
PI33xx-x0
Output Current Limit Protection
Overtemperature Protection
PI33xx-x0 has two methods implemented to protect from output
short or over current condition.
The internal package temperature is monitored to prevent internal
components from reaching their thermal maximum. If the Over
Temperature Protection Threshold (OTP) is exceeded (TOTP), the
regulator will complete the current switching cycle, enter a low
power mode, set a fault flag, and will soft-start when the internal
temperature falls below Overtemperature Restart Hysteresis
(TOTP_HYS). The OTP fault is stored in a Fault Register and can be
read and cleared (PI33xx-20 device versions only) via I2C data bus.
Slow Current Limit protection: prevents the output load from
sourcing current higher than the regulator’s maximum rated
current. If the output current exceeds the Current Limit (IOUT_CL)
for 1024µs, a slow current limit fault is initiated and the regulator
is shutdown which eliminates output current flow. After Fault
Restart Delay (tFR_DLY ), a soft-start cycle is initiated. This restart
cycle will be repeated indefinitely until the excessive load
is removed.
Pulse Skip Mode (PSM)
Fast Current Limit protection: PI33xx-x0 monitors the regulator
inductor current pulse-by-pulse to prevent the output from
supplying very high current due to sudden low impedance short
(50A Typical). If the regulator senses a high inductor current pulse,
it will initiate a fault and stop switching until Fault Restart Delay
ends and then initiate a soft-start cycle.
PI33xx-x0 features a PSM to achieve high efficiency at light loads.
The regulators are setup to skip pulses if EAO falls below a PSM
threshold. Depending on conditions and component values, this
may result in single pulses or several consecutive pulses followed
by skipped pulses. Skipping cycles significantly reduces gate drive
power and improves light load efficiency. The regulator will leave
PSM once the EAO rises above the Skip Mode threshold.
Both the Fast and Slow current limit faults are stored in a Fault
Register and can be read and cleared (PI33xx-20 device versions
only) via I2C data bus.
Variable Frequency Operation
Input Undervoltage Lockout
If VIN falls below the input Undervoltage Lockout (UVLO)
threshold, but remains high enough to power the internal bias
supply, the PI33xx-x0 will complete the current cycle, stop
switching, enter a low power state and initiate a fault. The system
will restart once the input voltage is reestablished and after the
Fault Restart Delay. A UVLO fault is stored in a Fault Register
and can be read and cleared (PI33xx-20 device versions only)
via I2C data bus.
Input Overvoltage Lockout
Each PI33xx-x0 is preprogrammed to a base operating frequency,
with respect to the power stage inductor (see Table 4), to operate
at peak efficiency across line and load variations. At low line
and high load applications, the base frequency will decrease to
accommodate these extreme operating ranges. By stretching the
frequency, the ZVS operation is preserved throughout the total
input line voltage range therefore maintaining
optimum efficiency.
Parallel Operation
Paralleling modules can be used to increase the output current
capability of a single power rail and reduce output voltage ripple.
If VIN exceeds the input Overvoltage Lockout (OVLO) threshold
(VOVLO), while the controller is running, the PI33xx-x0 will
complete the current cycle, stop switching, enter a low power
state and set an OVLO fault. The system will resume operation
when the input voltage falls below 98% of the OVLO threshold
and after the Fault Restart Delay. The OVLO fault is stored in a
Fault Register and can be read and cleared (PI33xx-20 device
versions only) via I2C™ data bus.
VIN
VIN
CIN
SYNCO(#2)
R1
SYNCI(#2)
EN(#2)
Output Overvoltage Protection
The PI33xx-x0 family is equipped with output Overvoltage
Protection (OVP) to prevent damage to input voltage sensitive
devices. If the output voltage exceeds 20% of its set regulated
value, the regulator will complete the current cycle, stop switching
and issue an OVP fault. The system will resume operation once
the output voltage falls below the OVP threshold and after
Fault Restart Delay. The OVP fault is stored in a Fault Register
and can be read and cleared (PI33xx-20 device versions only)
via I2C data bus.
PGND
VS1
PI33xx
(#1)
PWRGD
SYNCI
EAO
TRK
SGND
L1
VIN
PGND
VS1
VOUT
PI33xx
(#2)
PWRGD
SYNCO(#1)
SYNCI(#1)
EN(#1)
REM
EN
TRK(#2)
CIN
SYNCI
REM
SYNCO
EN
EAO(#1)
EAO
TRK(#1)
TRK
SGND
Figure 59 — PI33xx-x0 parallel operation
Cool-Power® ZVS Switching Regulators
Page 33 of 41
Rev 2.5
06/2017
VOUT
COUT
SYNCO
EAO(#2)
VIN
L1
VOUT
COUT
PI33xx-x0
Application Description
The PI33xx-x0 default for SYNCI is to sync with respect to the
falling edge of the applied clock providing 180° phase shift from
SYNCO. This allows for the paralleling of two PI33xx-x0 devices
without the need for further user programming or external
sync clock circuitry. The user can change the SYNCI polarity to
sync with the external clock rising edge via the I2C™ data bus
(PI33xx-20 device versions only).
Output Voltage Trim
By connecting the EAO pins and SGND pins of each module
together the units will share the current equally. When the TRK
pins of each unit are connected together, the units will track each
other during soft-start and all unit EN pins have to be released to
allow the units to start (See Figure 59). Also, any fault event in any
regulator will disable the other regulators. The two regulators will
be out of phase with each other reducing output ripple (refer to
Switching Frequency Synchronization).
To provide synchronization between regulators over the entire
operational frequency range, the Power Good (PWRGD) pin must
be connected to the lead regulator’s (#1) SYNCI pin and a
2.5kΩ Resistor, R1, must be placed between SYNCO (#2) return
and the lead regulator’s SYNCI (#1) pin, as shown in Figure 59.
In this configuration, at system soft-start, the PWRGD pin pulls
SYNCI low forcing the lead regulator to initialize the open-loop
startup synchronization. Once the regulators reach regulation,
SYNCI is released and the system is now synchronized in a closedloop configuration which allows the system to adjust, on the
fly, when any of the individual regulators begin to enter variable
frequency mode in the loop.
The PI33xx-x0 family of Buck Regulators provides seven common
output voltages: 1.0V, 1.8V, 2.5V, 3.3V, 5.0V, 12V and 15V. A
post-package trim step is implemented to offset any resistor
divider network errors ensuring maximum output accuracy. With
a single resistor connected from the ADJ pin to SGND or REM,
each device’s output can be varied above or below the nominal
set voltage (with the exception of the PI3311-X0 which can only
be above the set voltage of 1V).
Output Voltage
Device
Set
Range
PI3311-x0
1.0V
1.0 to 1.4V
PI3318-x0
1.8V
1.4 to 2.0V
PI3312-x0
2.5V
2.0 to 3.1V
PI3301-x0
3.3V
2.3 to 4.1V
PI3302-x0
5.0V
3.3 to 6.5V
PI3303-x0
12V
6.5 to 13.0V
PI3305-x0
15V
10.0 to 16.0V
Table 2 — PI33xx-x0 family output voltage range
The remote pin (REM) should always be connected to the VOUT
pin, if not used, to prevent an output voltage offset. Figure 60
shows the internal feedback voltage divider network.
Multi-phasing three regulators is possible (PI33xx-20 only) with
no change to the basic single-phase design. For more information
about how to program phase delays within the regulator, please
refer to Picor application note PI33xx-2x Multi-Phase
Design Guide.
VOUT
I2C™ Interface Operation
PI33xx-20 devices provide an I2C digital interface that enables the
user to program the EN pin polarity (from high to low assertion)
and switching frequency synchronization phase/delay. These are
one time programmable options to the device.
R4
REM
R1
Also, the PI33xx-20 devices allow for dynamic VOUT margining via
I2C that is useful during development (settings stored in volatile
memory only and not retained by the device). The PI33xx-20 also
have the option for fault telemetry including:
+
1.0VDC
■■Fast/Slow current limit
■■Output voltage high
■■Input overvoltage
■■Input undervoltage
■■Over temperature protection
Rlow
Rhigh
R2
SGND
Figure 60 — Internal resistor divider network
For more information about how to utilize the I2C interface please
refer to Picor application note PI33xx-2x I2C Digital
Interface Guide.
Cool-Power® ZVS Switching Regulators
Page 34 of 41
ADJ
R1, R2, and R4 are all internal 1.0% resistors and Rlow and Rhigh
are external resistors for which the designer can add to modify
VOUT to a desired output. The internal resistor value for each
regulator is listed below in Table 3.
Rev 2.5
06/2017
PI33xx-x0
Device
R1
R2
R4
PI3311-x0-LGIZ
1kΩ
Open
100Ω
PI3318-x0-LGIZ
0.806kΩ
1.0kΩ
100Ω
PI3312-x0-LGIZ
1.5kΩ
1.0kΩ
100Ω
PI3301-x0-LGIZ
2.61kΩ
1.13kΩ
100Ω
PI3302-x0-LGIZ
4.53kΩ
1.13kΩ
100Ω
PI3303-x0-LGIZ
11.0kΩ
1.0kΩ
100Ω
PI3305-x0-LGIZ
14.0kΩ
1.0kΩ
100Ω
Table 3 — PI33xx-x0 Internal divider values
By choosing an output voltage value within the ranges stated in
Table 2, VOUT can simply be adjusted up or down by selecting the
proper Rhigh or Rlow value, respectively. The following equations
can be used to calculate Rhigh and Rlow values:
Rhigh =
(V
1
Rlow =
( )
1
( )
(
( 4.0 – 1 )
1
–
1.13kΩ
2.61kΩ
Where tTRK is the soft-start time and ITRK is a 50µA internal charge
current (see Electrical Characteristics for limits).
There is typically either proportional or direct tracking
implemented within a design. For proportional tracking between
several regulators at startup, simply connect all devices TRK
pins together. This type of tracking will force all connected
regulators to startup and reach regulation at the same time
(see Figure 61(a)).
VOUT 1
(a)
(2)
Master VOUT
VOUT 2
If, for example, a 4.0V output is needed, the user should choose
the regulator with a trim range covering 4.0V from Table 2. For
this example, the PI3301 is selected (3.3V set voltage). First step
would be to use Equation (1) to calculate Rhigh since the required
output voltage is higher than the regulator set voltage. The
resistor-divider network values for the PI3301 are can be found
in Table 3 and are R1 = 2.61kΩ and R2 = 1.13kΩ. Inserting these
values in to Equation (1), Rhigh is calculated as follows:
3.78kΩ =
)
(3)
(b)
t
Figure 61 — PI33xx-x0 tracking methods
For Direct Tracking, choose the regulator with the highest output
voltage as the master and connect the master to the TRK pin of
the other regulators through a divider (Figure 62) with the same
ratio as the slave’s feedback divider (see Table 3 for values).
Master VOUT
Resistor Rhigh should be connected as shown in Figure 60 to
achieve the desired 4.0V regulator output. No external Rlow
resistor is need in this design example since the trim is above the
regulator set voltage.
PI33xx
The PI3311-xx output voltage can only be trimmed higher than
the factory 1V setting. The following Equation (4) can be used
calculate Rhigh values for the PI3311-xx regulators.
Rhigh (1V) =
(5)
VOUT 2
1
1
–
R2( VOUT – 1)
R1
1
CTRK = ( tTRK • ITRK ) – 100 • 10 -9
(1)
– 1)
1
–
R1
R2
OUT
pin, the soft-start time can be increased further. The following
equation can be used to calculate the proper capacitor for a
desired soft-start times:
1
( VOUT – 1)
R1
TRK
Slave
(4)
R2
SGND
R1
Soft-Start Adjust and Tracking
The TRK pin offers a means to increase the regulator’s soft-start
time or to track with additional regulators. The soft-start slope
is controlled by an internal 100nF and a fixed charge current to
provide a minimum startup time of 2ms (typical) for all PI33xx-x0
regulators. By adding an additional external capacitor to the TRK
Cool-Power® ZVS Switching Regulators
Page 35 of 41
Figure 62 — Voltage divider connections for direct tracking
All connected regulators’ soft-start slopes will track with this
method. Direct tracking timing is demonstrated in Figure 61(b). All
tracking regulators should have their Enable (EN) pins connected
together to work properly.
Rev 2.5
06/2017
PI33xx-x0
Inductor Pairing
Thermal measurements were made using a standard PI33xx-x0
Evaluation board which is 3 x 4 inches in area and uses 4-layer,
2oz copper. Thermal measurements were made on the three
main power devices, the two internal MOSFETs and the external
inductor, with air flows of 0, 200, and 400LFM.
The PI33xx-x0 utilizes an external inductor. This inductor has been
optimized for maximum efficiency performance. Table 4 details
the specific inductor value and part number utilized for each
PI33xx-x0 device which are available from Coiltronics and Eaton.
Data sheets are available at:
Filter Considerations
http://www.cooperindustries.com
Device
Inductor
[nH]
Inductor
Part Number
Manufacturer
PI3311-x0
125
FPV1006-125-R
Eaton
PI3318-x0
150
FPV1006-150-R
Eaton
PI3312-x0
200
FPT705-200-R
Coiltronics
PI3301-x0
200
FPT705-200-R
Coiltronics
PI3302-x0
200
FPT705-200-R
Coiltronics
PI3303-x0
230
FPT705-230-R
Coiltronics
PI3305-x0
230
FPT705-230-R
Coiltronics
The PI33xx-x0 requires input bulk storage capacitance as well as
low impedance ceramic X5R input capacitors to ensure proper
start up and high frequency decoupling for the power stage. The
PI33xx-x0 will draw nearly all of the high frequency current from
the low impedance ceramic capacitors when the main high side
MOSFET is conducting. During the time the high side MOSFET
is off, they are replenished from the bulk capacitor. If the input
impedance is high at the switching frequency of the converter,
the bulk capacitor must supply all of the average current into the
converter, including replenishing the ceramic capacitors. This value
has been chosen to be 100µF so that the PI33xx-x0 can start up
into a full resistive load and supply the output capacitive load with
the default minimum soft start capacitor when the input source
impedance is 50Ω at 1MHz. The ESR for this capacitor should be
approximately 20mΩ. The RMS ripple current in this capacitor is
small, so it should not be a concern if the input recommended
ceramic capacitors are used. Table 5 shows the recommended
input and output capacitors to be used for the various models
as well as expected transient response, RMS ripple currents per
capacitor, and input and output ripple voltages.
Table 6 includes the recommended input and output
ceramic capacitors.
Table 4 — PI33xx-x0 Inductor pairing
Thermal Derating
Thermal de-rating curves are provided that are based on
component temperature changes versus load current, input
voltage and air flow. It is recommended to use these curves as a
guideline for proper thermal de-rating. These curves represent the
entire system and are inclusive to both the PI33xx-x0 regulator
and the external inductor. Maximum thermal operation is limited
by either the MOSFETs or inductor depending upon line and
load conditions.
Device
VIN
(V)
PI3311
24
PI3318
24
PI3312
24
PI3301
24
PI3302
24
PI3303
24
PI3305
24
ILOAD
(A)
10
5
10
5
CINPUT
Ceramic
X5R
CINPUT
Bulk
Elec.
COUTPUT
Ceramic
X5R
CINPUT
Ripple
Current
(IRMS)
COUTPUT
Ripple
Current
(IRMS)
4 x 4.7µF
50V
100µF
50V
8 X 100µF
2 X 1µF
1 X 0.1µF
0.5
0.8
4 x 4.7µF
50
100µF
50V
6 X 100µF
2 X 1µF
1 X 0.1µF
0.5
0.8
4 x 4.7µF
100µF
50V
4 X 100µF
2 X 1µF
1 X 0.1µF
1
1.75
4 x 4.7µF
100µF
50V
4 X 100µF
2 X 1µF
1 X 0.1µF
1.05
1.625
4 x 4.7µF
100µF
50V
4 X 47µF
2 X 1µF
1 X 0.1µF
1.2
1.5
4 x 4.7µF
100µF
50V
4 X 22µF
2 X 1µF
1 X 0.1µF
1.3
1.36
4 x 4.7µF
100µF
50V
4 X 22µF
2 X 1µF
1 X 0.1µF
1.38
1.2
10
5
10
5
10
5
8
4
8
4
Table 5 — Recommended input and output capacitance
Cool-Power® ZVS Switching Regulators
Page 36 of 41
Rev 2.5
06/2017
Input
Ripple
(mVpp)
Output
Ripple
(mVpp)
120
20
100
15
120
20
100
15
150
50
100
24
200
40
125
33
220
50
140
30
275
100
150
60
280
150
160
75
Output
Ripple
(mVpp)
Recovery
Time
(µs)
Load
Step
(A)
(Slew/µs)
±40
40
5
(5A/µs)
±40
40
5
(5A/µs)
±80
25
5
(10A/µs)
±100
20
5
(10A/µs)
±170
30
5
(5A/µs)
±300
30
4
(10A/µs)
±400
30
4
(10A/µs)
PI33xx-x0
Murata Part Number
Description
GRM188R71C105KA12D
1µF 16V 0603 X7R
GRM319R71H104KA01D
0.1µF 50V 1206 X7R
GRM31CR60J107ME39L
100µF 6.3V 1206 X5R
GRM31CR71H475KA12K
4.7µF 50V 1206 X7R
GRM31CR61A476ME15L
47µF 10V 1206 X5R
GRM31CR61E226KE15L
22µF 25V 1206 X5R
When Q1 is on and Q2 is off, the majority of CIN’s current is used
to satisfy the output load and to recharge the COUT capacitors.
When Q1 is off and Q2 is on, the load current is supplied by the
inductor and the COUT capacitor as shown in Figure 65. During
this period CIN is also being recharged by the VIN. Minimizing CIN
loop inductance is important to reduce peak voltage excursions
when Q1 turns off. Also, the difference in area between the CIN
loop and COUT loop is vital to minimize switching and GND noise.
Table 6 — Capacitor manufacturer part numbers
Layout Guidelines
VIN
To optimize maximum efficiency and low noise performance
from a PI33xx-x0 design, layout considerations are necessary.
Reducing trace resistance and minimizing high current loop
returns along with proper component placement will contribute
to optimized performance.
CIN
COUT
A typical buck converter circuit is shown in Figure 63. The
potential areas of high parasitic inductance and resistance are the
circuit return paths, shown as LR below.
Figure 65 — Current flow: Q2 closed
VIN
COUT
CIN
The recommended component placement, shown in Figure 66,
illustrates the tight path between CIN and COUT (and VIN and VOUT )
for the high AC return current. This optimized layout is used on
the PI33xx-x0 evaluation board.
VOUT
Figure 63 — Typical Buck Converter
COUT
GND
The path between the COUT and CIN capacitors is of particular
importance since the AC currents are flowing through both of
them when Q1 is turned on.
CIN
VIN
Figure 64, schematically, shows the reduced trace length
between input and output capacitors. The shorter path
lessens the effects that copper trace parasitics can have on the
PI33xx-x0 performance.
VSW
GND
Q1
VIN
Figure 66 — Recommended component placement and
CIN
metal routing
COUT
Q2
IND
Figure 67 details the recommended receiving footprint for
PI33xx-x0 10mm x 14mm package. All pads should have a final
copper size of 0.55mm x 0.55mm, whether they are solder-mask
defined or copper defined, on a 1mm x 1mm grid. All stencil
openings are 0.45mm when using either a 5mil or 6mil stencil.
Figure 64 — Current flow: Q1 closed
Cool-Power® ZVS Switching Regulators
Page 37 of 41
Rev 2.5
06/2017
PI33xx-x0
Recommended PCB Footprint and Stencil
Figure 67 — Recommended Receiving PCB footprint
Cool-Power® ZVS Switching Regulators
Page 38 of 41
Rev 2.5
06/2017
PI33xx-x0
LGIZ Package Drawing
DIMESIONAL REFERENCES
REF.
MIN
NOM
2.50
2.56
A
A1
A2
0.50
0.55
b
L
0.50
0.55
14.00
BSC
D
10.00 BSC
E
13.00 BSC
D1
E1
9.00 BSC
e
1.00 BSC
0.10
0.15
L1
aaa
bbb
ccc
ddd
eee
Cool-Power® ZVS Switching Regulators
Page 39 of 41
Rev 2.5
06/2017
MAX
2.62
0.05
2.57
0.60
0.60
0.20
0.10
0.10
0.08
0.10
0.08
PI33xx-x0
Revision History
Revision
Date
1.5
06/13
1.6
08/03/15
Description
Last release in old format
Page Number(s)
n/a
Reformatted in new template
n/a
6, 21, 22, 25, 26,
29, 30 & 36
1.7
08/21/15
Formatting edits
1.8
09/18/15
Formatting edits
1.9
01/06/16
Clarifications made in Enable Pin Conditions
BGA package added
7, 18, 22, 26 & 30
1, 3, 20–23, 34 & 40
2.0
02/22/16
Corrected Input Current spec unit of measure from mA to A
12, 16, 20, 24 & 28
2.1
05/27/16
Revised Output Voltage Total Regulation
2.2
08/22/16
Corrected typo in temp range for Electrical Characteristics tables
2.3
11/21/16
Clarified VS1 rating in Absolute Maximum Ratings Table
Updated pin description table and package pin-out labels
to show VDR capability
2.4
02/10/17
Block diagram typo corrected, VS1 Spec expanded
PWRGD Pin Description updated
Specification conditions clarified
2.5
06/01/17
Move BGA package to separate data sheet
Corrections
all
Note: page removed in Revision 2.5.
Cool-Power® ZVS Switching Regulators
Page 40 of 41
Rev 2.5
06/2017
12
7, 9, 10, 12, 13, 16, 17, 20,
21, 24, 25, 28 & 29
4
5
4
5
6, 9
1, 3, 20-23, 40
1, 6-7, 9-31, 35
PI33xx-x0
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Cool-Power® ZVS Switching Regulators
Page 41 of 41
Rev 2.5
06/2017