Renesas ISL78233EVAL2Z 3a and 4a compact synchronous buck regulator Datasheet

DATASHEET
ISL78233, ISL78234
FN8359
Rev 8.00
Apr 19, 2018
3A and 4A Compact Synchronous Buck Regulators
The ISL78233, ISL78234 are highly efficient, monolithic,
synchronous step-down DC/DC converters that can deliver 3A
(ISL78233), or 4A (ISL78234) of continuous output current from
a 2.7V to 5.5V input supply. The devices use current mode control
architecture to deliver a very low duty cycle operation at high
frequency with fast transient response and excellent loop stability.
The ISL78233, ISL78234 integrate a very low ON-resistance
P-channel (35mΩ) high-side FET and N-channel (11mΩ)
low-side FET to maximize efficiency and minimize external
component count. The 100% duty-cycle operation allows less
than 200mV dropout voltage at 4A output current. The
operation frequency of the Pulse-Width Modulator (PWM) is
adjustable from 500kHz to 4MHz. The default switching
frequency of 2MHz is set by connecting the FS pin high.
• Very low ON-resistance FETs - P-channel 35mΩ and
N-channel 11mΩ typical values
• High efficiency synchronous buck regulator with up to 95%
efficiency
• Complete BOM with as few as 3 external parts
• Internal soft-start - 1ms or adjustable
• Soft-stop output discharge during disable
Fault protection is provided by internal Hiccup mode current
limiting during short-circuit and overcurrent conditions. Other
protection, such as overvoltage and over-temperature are also
integrated into the device. A power-good output voltage
monitor indicates when the output is in regulation.
The ISL78233, ISL78234 is available in a 3mmx3mm 16 Ld
Thin Quad Flat (TQFN) Pb-free package and in a 5mmx5mm
16 Ld Wettable Flank Quad Flat No-Lead (WFQFN) package
with an exposed pad for improved thermal performance. The
ISL78233, ISL78234 are rated to operate across the
temperature range of -40°C to +125°C.
• 2.7V to 5.5V input voltage range
• -1.2%/1% reference accuracy over temperature/load/line
The ISL78233, ISL78234 can be configured for discontinuous
or forced continuous operation at light load. Forced continuous
operation reduces noise and RF interference, while
discontinuous mode provides higher efficiency by reducing
switching losses at light loads.
The ISL78233, ISL78234 offers a 1ms Power-Good (PG) timer
at power-up. When in shutdown, the ISL78233, ISL78234
discharges the output capacitor through an internal soft-stop
switch. Other features include internal fixed or adjustable
soft-start and internal/external compensation.
Features
• Adjustable frequency from 500kHz to 4MHz - default at
2MHz
• External synchronization up to 4MHz
• Over-temperature, overcurrent, overvoltage, and negative
overcurrent protection
• Shared common device pinout allows simplified output
power upgrades over time
• Tiny 3mmx3mm TQFN package
• AEC-Q100 qualified
Applications
• DC/DC POL modules
• μC/µP, FPGA, and DSP power
• Video processor/SOC power
• Li-ion battery powered devices
• Automotive infotainment power
Related Literature
For a full list of related documents, visit our website
- ISL78233, ISL78234 product page
100
3.3VOUT
EFFICIENCY (%)
90
80
1.2VOUT
1.5VOUT
1.8VOUT
70 2.5VOUT
60
50
40
0.0
0.5
1.0
1.5
2.0
2.5
OUTPUT LOAD (A)
3.0
3.5
4.0
FIGURE 1. EFFICIENCY vs LOAD (2MHz 5VIN PFM, TA = +25°C)
FN8359 Rev 8.00
Apr 19, 2018
Page 1 of 21
ISL78233, ISL78234
Pin Configuration
PHASE
15
PHASE
16
PHASE
VIN
ISL78233, ISL78234
(16 LD TQFN)
TOP VIEW
14
13
VDD
2
11
PGND
PG
3
10
SGND
SYNC
4
9
FB
5
6
7
8
COMP
PGND
SS
12
FS
1
EN
VIN
Pin Descriptions
PIN NUMBER
SYMBOL
DESCRIPTION
1, 16
VIN
Input supply voltage. Place a minimum of two 22µF ceramic capacitors from VIN to PGND as close as
possible to the IC for decoupling.
2
VDD
Input supply voltage for logic. Connect to VIN pin.
3
PG
Power-good is an open-drain output. Use a 10kΩ to 100kΩ pull-up resistor connected between VIN and
PG. At power-up or EN HI, PG rising edge is delayed by 1ms upon output reached within regulation.
4
SYNC
Mode Selection pin. Connect to logic high or input voltage VIN for PWM mode. Connect to logic low or
ground for PFM mode. Connect to an external function generator for synchronization with the positive
edge trigger. There is an internal 1MΩ pull-down resistor to prevent an undefined logic state in case
of SYNC pin float.
5
EN
Regulator enable pin. Enable the output when driven to high. Shutdown the chip and discharge output
capacitor when driven to low.
6
FS
This pin sets the oscillator switching frequency, using a resistor, RFS, from the FS pin to GND. The
frequency of operation may be programmed between 500kHz to 4MHz. The default frequency is 2MHz
if FS is connected to VIN.
7
SS
SS is used to adjust the soft-start time. Set to SGND for internal 1ms rise time. Connect a capacitor from
SS to SGND to adjust the soft-start time. Do not use more than 33nF per IC.
8, 9
COMP, FB
The feedback network of the regulator, FB, is the negative input to the transconductance error
amplifier. COMP is the output of the amplifier if COMP not tied to VDD. Otherwise, COMP is
disconnected through a MOSFET for internal compensation. Must connect COMP to VDD in internal
compensation mode. The output voltage is set by an external resistor divider connected to FB. With a
properly selected divider, the output voltage can be set to any voltage between the power rail (reduced
by converter losses) and the 0.6V reference. There is an internal compensation to meet a typical
application. Additional external networks across COMP and SGND might be required to improve the
loop compensation of the amplifier operation.
In addition, the regulator power-good and undervoltage protection circuitry use FB to monitor the
regulator output voltage.
10
SGND
Signal ground
11, 12
PGND
Power ground
13, 14, 15
PHASE
Switching node connections. Connect to one terminal of the inductor. This pin is discharged by a 100Ω
resistor when the device is disabled. See “Functional Block Diagram” on page 5 for more detail.
Exposed Pad
-
FN8359 Rev 8.00
Apr 19, 2018
The exposed pad must be connected to the SGND pin for proper electrical performance. Place as
many vias as possible under the pad connecting to SGND plane for optimal thermal performance.
Page 2 of 21
ISL78233, ISL78234
Ordering Information
PART NUMBER
(Note 4)
PART
MARKING
OUTPUT VOLTAGE
(V)
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL78233ARZ (Note 2)
8233
Adjustable
-40 to +125
-
16 Ld 3x3 TQFN
L16.3x3D
ISL78233ARZ-T (Notes 1, 2)
8233
Adjustable
-40 to +125
6k
16 Ld 3x3 TQFN
L16.3x3D
ISL78233ARZ-T7A (Notes 1, 2)
8233
Adjustable
-40 to +125
250
16 Ld 3x3 TQFN
L16.3x3D
ISL78233AARZ (Note 3)
78233A ARZ
Adjustable
-40 to +125
-
16 Ld 5x5mm WFQFN
L16.5x5D
ISL78233AARZ-T (Notes 1, 3)
78233A ARZ
Adjustable
-40 to +125
6k
16 Ld 5x5mm WFQFN
L16.5x5D
ISL78233AARZ-T7A (Notes 1, 3) 78233A ARZ
Adjustable
-40 to +125
250
16 Ld 5x5mm WFQFN
L16.5x5D
ISL78234ARZ (Note 2)
8234
Adjustable
-40 to +125
-
16 Ld 3x3 TQFN
L16.3x3D
ISL78234ARZ-T (Notes 1, 2)
8234
Adjustable
-40 to +125
6k
16 Ld 3x3 TQFN
L16.3x3D
ISL78234ARZ-T7A (Notes 1, 2)
8234
Adjustable
-40 to +125
250
16 Ld 3x3 TQFN
L16.3x3D
ISL78234AARZ (Note 3)
78234A ARZ
Adjustable
-40 to +125
-
16 Ld 5x5mm WFQFN
L16.5x5D
ISL78234AARZ-T (Notes 1, 3)
78234A ARZ
Adjustable
-40 to +125
6k
16 Ld 5x5mm WFQFN
L16.5x5D
ISL78234AARZ-T7A (Notes 1, 3) 78234A ARZ
Adjustable
-40 to +125
250
16 Ld 5x5mm WFQFN
L16.5x5D
ISL78233EVAL1Z
3x3mm TQFN Evaluation Board
ISL78234EVAL1Z
3x3mm TQFN Evaluation Board
ISL78233EVAL2Z
5x5mm WFQFN Evaluation Board
ISL78234EVAL2Z
5x5mm WFQFN Evaluation Board
NOTES:
1. Refer to TB347 for details about reel specifications.
2. These 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). 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. These Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu-Ag plate - e4
termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. 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.
4. For Moisture Sensitivity Level (MSL), please see the ISL78233, ISL78234 product information pages. For more information about MSL see TB363.
TABLE 1. KEY DIFFERENCE BETWEEN FAMILY OF PARTS
FN8359 Rev 8.00
Apr 19, 2018
PART NUMBER
IOUT MAX
(A)
ISL78233
3
ISL78234
4
ISL78235
5
Page 3 of 21
ISL78233, ISL78234
Typical Application Diagram
C1
2 x 22µF
R1
100k
2
3
PG
VIN
PHASE
+1.8V/4A
1.0µH
C2
2 x 22µF
13
14
ISL78233, ISL78234
VOUT
GND
PGND 12
VDD
PGND
PG
SGND
R2
200k 
C3*
22pF
11
R3
10
100k
PAD
+0.6V
17
8
SS
7
9
*C3 IS OPTIONAL. IT IS
RECOMMENDED TO PUT A
PLACEHOLDER FOR IT AND CHECK
LOOP ANALYSIS BEFORE USE.
EN
5
FB
COMP
SYNC
EN
4
FS
GND
1
6
VIN
+2.7V …+5.5V
PHASE
15
VIN
PHASE
16
L1
FIGURE 2. TYPICAL APPLICATION DIAGRAM
TABLE 2. COMPONENT SELECTION TABLE
VOUT
1.2V
1.5V
1.8V
2.5V
3.3V
3.6V
C1
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
C2
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
2 x 22µF
C3
22pF
22pF
22pF
22pF
22pF
22pF
L1
0.33-0.68µH
0.33-0.68µH
0.33-0.68µH
0.47-0.78µH
0.47-0.78µH
0.47-0.78µH
R2
100kΩ
150kΩ
200kΩ
316kΩ
450kΩ
500kΩ
R3
100kΩ
100kΩ
100kΩ
100kΩ
100kΩ
100kΩ
FN8359 Rev 8.00
Apr 19, 2018
Page 4 of 21
ISL78233, ISL78234
COMP
SS
SHUTDOWN
FS
SYNC
55pF
Soft
SOFTSTART
SHUTDOWN
VDD
100kΩ
+
BANDGAP VREF
+
EN
+
COMP
-
EAMP
-
VIN
OSCILLATOR
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
HS DRIVER
3pF
+
P
PHASE
LS
DRIVER
N
PGND
FB
6kΩ
SLOPE
Slope
COMP
0.8V
+
CSA
-
+
OV
0.85*VREF
PG
+
UV
+
OCP
-
+
SKIP
-
ISET
THRESHOLD
1ms
DELAY
NEG CURRENT
SENSING
SGND
ZERO-CROSS
SENSING
0.5V
SCP
+
100Ω
SHUTDOWN
FIGURE 3. FUNCTIONAL BLOCK DIAGRAM
FN8359 Rev 8.00
Apr 19, 2018
Page 5 of 21
ISL78233, ISL78234
Absolute Maximum Ratings (Reference to GND)
Thermal Information
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.8V (DC) or 7V (20ms)
EN, FS, PG, SYNC, VFB . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN + 0.3V
PHASE . . . . . . . . . . . . -1.5V (100ns)/-0.3V (DC) to 6.5V (DC) or 7V (20ms)
COMP, SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
ESD Rating
Human Body Model (Tested per AEC-Q100-002) . . . . . . . . . . . . . . . . 5kV
Machine Model (Tested per AEC-Q100-003) . . . . . . . . . . . . . . . . . . 300V
Charge Device Model (Tested per AEC-Q100-011) . . . . . . . . . . . . . . . 2kV
Latch-Up (Tested per AEC-Q100-004, Class II, Level A) . . . . . . . . . . 100mA
Thermal Resistance
JA (°C/W) JC (°C/W)
16 Ld TQFN Package (Notes 5, 6) . . . . . . .
43
3.5
16 Ld WFQFN Package (Notes 5, 6) . . . . .
33
3.5
Operating Junction Temperature Range . . . . . . . . . . . . . .-55°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Load Current Range
(ISL78233) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 3A
(ISL78234) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 4A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
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:
5. JA is measured in free air with the component mounted on a high-effective thermal conductivity test board with “direct attach” features. See TB379.
6. JC, “case temperature” location is at the center of the exposed metal pad on the package underside.
Electrical Specifications Unless otherwise noted, all parameter limits are established across the recommended operating conditions
and the specification limits are measured at the following conditions: TA = -40°C to +125°C, VIN = 3.6V, EN = VIN, unless otherwise noted. Typical values
are at TA = +25°C. Boldface limits apply across the operating temperature range, -40°C to +125°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
2.5
2.7
V
INPUT SUPPLY
VIN Undervoltage Lockout Threshold
VUVLO
Rising, no load
Falling, no load
Quiescent Supply Current
Shutdown Supply Current
IVIN
ISD
2.45
V
SYNC = GND, no load at the output
2.2
45
µA
SYNC = GND, no load at the output and no
switches switching
45
60
µA
SYNC = VIN, FS = 2MHz, no load at the output
19
25
mA
SYNC = GND, VIN = 5.5V, EN = low
3.8
10
µA
0.600
0.606
V
OUTPUT REGULATION
Reference Voltage
VREF
VFB Bias Current
IVFB
0.593
VFB = 0.75V
0.1
µA
Line Regulation
VIN = VO + 0.5V to 5.5V (minimal 2.7V)
0.2
%/V
Soft-Start Ramp Time Cycle
SS = SGND
1
ms
Soft-Start Charging Current
ISS
VSS = 0.1V
1.7
2.1
2.5
µA
OVERCURRENT PROTECTION
Current Limit Blanking Time
tOCON
Overcurrent and Auto Restart Period
tOCOFF
Positive Peak Current Limit
IPLIMIT
FN8359 Rev 8.00
Apr 19, 2018
17
Clock
pulses
8
ISL78234, TA = +25°C
5.4
ISL78234, TA = -40°C to +125°C
5.2
ISL78233, TA = +25°C
3.9
ISL78233, TA = -40°C to +125°C
3.7
6.7
4.9
SS cycle
8.1
A
9
A
6
A
6.6
A
Page 6 of 21
ISL78233, ISL78234
Electrical Specifications Unless otherwise noted, all parameter limits are established across the recommended operating conditions
and the specification limits are measured at the following conditions: TA = -40°C to +125°C, VIN = 3.6V, EN = VIN, unless otherwise noted. Typical values
are at TA = +25°C. Boldface limits apply across the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
Peak Skip Limit
SYMBOL
ISKIP
TEST CONDITIONS
ISL78234, TA = +25°C
ISL78234, TA = -40°C to +125°C
INLIMIT
TYP
MAX
(Note 7)
UNIT
0.9
1.1
1.35
A
1.5
A
0.84
ISL78233, TA = +25°C
0.7
1.2
A
ISL78233, TA = -40°C to +125°C
0.6
1.3
A
-275
375
mA
-1.3
A
-0.6
A
Zero Cross Threshold
Negative Current Limit
MIN
(Note 7)
TA = +25°C
-5.1
TA = -40°C to +125°C
-6.0
0.9
-2.8
COMPENSATION
Error Amplifier Transconductance
Transresistance
RT
COMP = VDD, internal compensation
125
µA/V
External compensation
130
µA/V
4A application
0.145
0.2
0.25
Ω
VIN = 5V, IO = 200mA
26
35
50
mΩ
VIN = 2.7V, IO = 200mA
38
52
78
mΩ
VIN = 5V, IO = 200mA
5
11
20
mΩ
VIN = 2.7V, IO = 200mA
8
15
31
mΩ
PHASE
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
PHASE Maximum Duty Cycle
100
PHASE Minimum On-Time
SYNC = High
%
100
ns
2350
kHz
OSCILLATOR
Nominal Switching Frequency
fSW
FS = VIN
1700
FS with RS = 402kΩ
420
FS with RS = 42.2kΩ
SYNC Logic LOW to HIGH Transition Range
2000
kHz
4200
0.67
SYNC Hysteresis
0.75
kHz
0.84
0.17
SYNC Logic Input Leakage Current
VIN = 3.6V
3.7
V
V
5
µA
0.3
V
1
2
ms
0.01
0.1
µA
PG
Output Low Voltage
IPG = 1mA
Delay Time (Rising Edge)
Time from VOUT reached regulation
PG Pin Leakage Current
PG = VIN
0.5
OVP PG Rising Threshold
0.80
UVP PG Rising Threshold
80
86
V
90
%
UVP PG Hysteresis
5.5
%
PGOOD Delay Time (Falling Edge)
6.5
µs
EN
Logic Input Low (Note 8)
EN_VIL
Logic Input High
EN_VIH
EN Logic Input Leakage Current
0.4
0.9
V
V
Pulled up to 3.6V
0.1
1
µA
Thermal Shutdown
Temperature Rising
150
°C
Thermal Shutdown Hysteresis
Temperature Falling
25
°C
NOTE:
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
8. EN should be held below the EN_VIL until VIN exceeds VUVLO rising.
FN8359 Rev 8.00
Apr 19, 2018
Page 7 of 21
ISL78233, ISL78234
Typical Operating Performance
Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 5V, EN = VIN,
SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A.
100
100
2.5VOUT
2.5VOUT
90
80
1.5VOUT
1.2VOUT
EFFICIENCY (%)
EFFICIENCY (%)
90
1.8VOUT
70
60
50
80
1.5VOUT
1.2VOUT
1.8VOUT
70
60
50
40
0.0
0.5
1.0
1.5
2.0
2.5
OUTPUT LOAD (A)
3.0
3.5
40
4.0
0.0
FIGURE 4. EFFICIENCY vs LOAD (2MHz, 3.3VIN PWM)
0.5
1.0
1.5
2.0
2.5
OUTPUT LOAD (A)
3.0
3.5
4.0
FIGURE 5. EFFICIENCY vs LOAD (2MHz, 3.3VIN PFM)
100
100
2.5VOUT
3.3VOUT
90
3.3VOUT
90
1.5VOUT
1.2VOUT
EFFICIENCY (%)
EFFICIENCY (%)
2.5VOUT
80
1.8VOUT
70
60
50
40
1.2VOUT
1.8VOUT
70
60
50
0.0
0.5
1.0
1.5
2.0
2.5
OUTPUT LOAD (A)
3.0
3.5
40
0.0
4.0
FIGURE 6. EFFICIENCY vs LOAD (2MHz, 5VIN PWM)
1.219
1.515
1.214
1.510
1.209
3.3VIN PFM
1.204
5VIN PFM
1.199
5VIN PWM
1.194
1.189
3.3VIN PWM
1.184
1.179
0.5
1.0
1.5
2.0
2.5
OUTPUT LOAD (A)
3.0
3.5
4.0
FIGURE 7. EFFICIENCY vs LOAD (2MHz, 5VIN PFM)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.5VOUT
80
3.3VIN PFM
1.505
1.500
5VIN PFM
1.495
5VIN PWM
1.490
1.485
3.3VIN PWM
1.480
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT LOAD (A)
FIGURE 8. VOUT REGULATION vs LOAD (1MHz, VOUT = 1.2V)
FN8359 Rev 8.00
Apr 19, 2018
4.0
1.475
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT LOAD (A)
FIGURE 9. VOUT REGULATION vs LOAD (1MHz, VOUT = 1.5V)
Page 8 of 21
4.0
ISL78233, ISL78234
Typical Operating Performance
Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 5V, EN = VIN,
1.815
2.505
1.810
2.500
1.805
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A. (Continued)
3.3VIN PFM
1.800
5VIN PFM
1.795
5VIN PWM
1.790
1.785
3.3VIN PWM
1.780
1.775
0.0
0.5
1.0
2.495
3.3VIN PFM
2.490
5VIN PFM
2.485
2.475
3.3VIN PWM
2.470
1.5
2.0
2.5
3.0
3.5
4.0
5VIN PWM
2.480
2.465
0.0
0.5
1.0
1.5
2.5
3.0
3.5
4.0
FIGURE 11. VOUT REGULATION vs LOAD (1MHz, VOUT = 2.5V)
FIGURE 10. VOUT REGULATION vs LOAD (1MHz, VOUT = 1.8V)
3.309
75
PHASE MINIMUM ON-TIME (ns)
3.301
OUTPUT VOLTAGE (V)
2.0
OUTPUT LOAD (A)
OUTPUT LOAD (A)
5VIN PWM
3.293
3.285
5VIN PFM
3.277
3.269
3.261
3.253
3.245
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
T = +125°C
70
65
60
T = +25°C
55
T = -40°C
50
3.0
3.5
4.0
OUTPUT LOAD (A)
FIGURE 12. VOUT REGULATION vs LOAD (1MHz, VOUT = 3.3V)
PHASE 5V/DIV
4.5
VIN (V)
5.5
FIGURE 13. PHASE MINIMUM ON-TIME vs VIN (2MHz)
PHASE 5V/DIV
VOUT 1V/DIV
VOUT 1V/DIV
VEN 5V/DIV
VEN 5V/DIV
PG 5V/DIV
PG 5V/DIV
400µs/DIV
FIGURE 14. START-UP AT NO LOAD (PFM)
FN8359 Rev 8.00
Apr 19, 2018
5.0
400µs/DIV
FIGURE 15. START-UP AT NO LOAD (PWM)
Page 9 of 21
6.0
ISL78233, ISL78234
Typical Operating Performance
Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 5V, EN = VIN,
SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A. (Continued)
PHASE 5V/DIV
VOUT 1V/DIV
PHASE 5V/DIV
VOUT 1V/DIV
VEN 5V/DIV
VEN 5V/DIV
PG 5V/DIV
PG 5V/DIV
400µs/DIV
400µs/DIV
FIGURE 16. SHUTDOWN AT NO LOAD (PFM)
FIGURE 17. SHUTDOWN AT NO LOAD (PWM)
PHASE 5V/DIV
PHASE 5V/DIV
VOUT 1V/DIV
VOUT 1V/DIV
VEN 5V/DIV
VEN 5V/DIV
PG 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 18. START-UP AT 4A LOAD (PWM)
500µs/DIV
FIGURE 19. SHUTDOWN AT 4A LOAD (PWM)
IOUT 2A/DIV
IOUT 2A/DIV
VOUT 1V/DIV
VOUT 1V/DIV
VEN 5V/DIV
VEN 5V/DIV
PG 5V/DIV
PG 5V/DIV
500µs/DIV
500µs/DIV
FIGURE 20. START-UP AT 4A LOAD (PFM)
FIGURE 21. SHUTDOWN AT 4A LOAD (PFM)
FN8359 Rev 8.00
Apr 19, 2018
Page 10 of 21
ISL78233, ISL78234
Typical Operating Performance
Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 5V, EN = VIN,
SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A. (Continued)
PHASE 1V/DIV
PHASE 1V/DIV
10ns/DIV
10ns/DIV
FIGURE 22. JITTER AT NO LOAD PWM (1MHz)
FIGURE 23. JITTER AT FULL LOAD PWM (1MHz)
PHASE 5V/DIV
PHASE 5V/DIV
VOUT RIPPLE 20mV/DIV
VOUT RIPPLE 20mV/DIV
IL 1A/DIV
IL 1A/DIV
500ns/DIV
20ms/DIV
FIGURE 24. STEADY STATE AT NO LOAD PWM
FIGURE 25. STEADY STATE AT NO LOAD PFM
PHASE 5V/DIV
VOUT RIPPLE 20mV/DIV
IL 2A/DIV
500ns/DIV
FIGURE 26. STEADY STATE AT 4A PWM
FN8359 Rev 8.00
Apr 19, 2018
Page 11 of 21
ISL78233, ISL78234
Typical Operating Performance
Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 5V, EN = VIN,
SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A. (Continued)
VOUT RIPPLE 100mV/DIV
VOUT RIPPLE 100mV/DIV
ILOAD 2A/DIV
ILOAD 2A/DIV
200µs/DIV
200µs/DIV
FIGURE 27. LOAD TRANSIENTS (PWM)
FIGURE 28. LOAD TRANSIENTS (PFM)
PHASE 5V/DIV
VOUT 1V/DIV
IL 2A/DIV
IL 5A/DIV
VOUT 1V/DIV
PG 5V/DIV
PG 5V/DIV
4µs/DIV
40µs/DIV
FIGURE 29. OUTPUT SHORT-CIRCUIT
FIGURE 30. OVERCURRENT PROTECTION
PHASE 5V/DIV
VOUT 1V/DIV
VOUT 2V/DIV
IL 5A/DIV
PG 2V/DIV
PG 5V/DIV
20µs/DIV
FIGURE 31. OVERVOLTAGE PROTECTION
FN8359 Rev 8.00
Apr 19, 2018
20ms/DIV
FIGURE 32. OVER-TEMPERATURE PROTECTION
Page 12 of 21
ISL78233, ISL78234
Theory of Operation
The ISL78233, ISL78234 are step-down switching regulators
optimized for automotive battery powered applications. The
regulator operates at a 2MHz default switching frequency for
high efficiency and allow smaller form factor, when FS is
connected to VIN. By connecting a resistor from FS to SGND, the
operational frequency adjustable range is 500kHz to 4MHz. At
light load, the regulator reduces the switching frequency, unless
forced to the fixed frequency, to minimize the switching loss and
to maximize the battery life. The quiescent current when the
output is not loaded is typically only 45µA. The supply current is
typically only 3.8µA when the regulator is shut down.
PWM Control Scheme
Pulling the SYNC pin HI (>0.8V) forces the converter into PWM
mode, regardless of output current. The ISL78233, ISL78234
employs the current-mode Pulse-Width Modulation (PWM)
control scheme for fast transient response and pulse-by-pulse
current limiting. Figure 3 on page 5 shows the functional block
diagram. The current loop consists of the oscillator, the PWM
comparator, current-sensing circuit, and the slope compensation
for the current loop stability. The slope compensation is
440mV/Ts, which changes proportionally with frequency. The
gain for the current-sensing circuit is typically 200mV/A. The
control reference for the current loops comes from the Error
Amplifier's (EAMP) output.
The PWM operation is initialized by the clock from the oscillator.
The P-channel MOSFET is turned on at the beginning of a PWM
cycle and the current in the MOSFET starts to ramp up. When the
sum of the current amplifier CSA and the slope compensation
reaches the control reference of the current loop, the PWM
comparator COMP sends a signal to the PWM logic to turn off the
PFET and turn on the N-channel MOSFET. The NFET stays on until
the end of the PWM cycle. Figure 33 shows the typical operating
waveforms during the PWM operation. The dotted lines illustrate
the sum of the slope compensation ramp and the current-sense
amplifier’s CSA output.
The output voltage is regulated by controlling the VEAMP voltage
to the current loop. The bandgap circuit outputs a 0.6V reference
voltage to the voltage loop. The feedback signal comes from the
VFB pin. The soft-start block only affects the operation during the
start-up and will be discussed separately. The error amplifier is a
transconductance amplifier that converts the voltage error signal
to a current output. The voltage loop is internally compensated
with the 55pF and 100kΩ RC network. The maximum EAMP
voltage output is precisely clamped to 2.5V.
FN8359 Rev 8.00
Apr 19, 2018
VEAMP
VCSA
DUTY
CYCLE
IL
VOUT
FIGURE 33. PWM OPERATION WAVEFORMS
Skip Mode
Pulling the SYNC pin LO (<0.4V) forces the converter into PFM
mode. The ISL78233, ISL78234 enters a Pulse-Skipping mode
at light load to minimize the switching loss by reducing the
switching frequency. Figure 34 on page 14 illustrates Skip mode
operation. A zero-cross sensing circuit shown in Figure 3 on
page 5 monitors the NFET current for zero crossing. When 16
consecutive cycles are detected, the regulator enters Skip mode.
During the sixteen detecting cycles, the current in the inductor is
allowed to become negative. The counter is reset to zero when
the current in any cycle does not cross zero.
Once Skip mode is entered, the pulse modulation starts being
controlled by the Skip comparator shown in Figure 3 on page 5.
Each pulse cycle is still synchronized by the PWM clock. The PFET
is turned on at the clock's rising edge and turned off when the
output is higher than 1.2% of the nominal regulation or when its
current reaches the peak Skip current limit value. Then, the
inductor current is discharging to 0A and stays at zero (the
internal clock is disabled), and the output voltage reduces
gradually due to the load current discharging the output
capacitor. When the output voltage drops to the nominal voltage,
the PFET will be turned on again at the rising edge of the internal
clock as it repeats the previous operations.
The regulator resumes normal PWM mode operation when the
output voltage drops 1.2% below the nominal voltage.
Page 13 of 21
ISL78233, ISL78234
PWM
PFM
PWM
CLOCK
16 CYCLES
IL
PFM CURRENT LIMIT
LOAD CURRENT
0
NOMINAL +1%
VOUT
NOMINAL -1.5%
NOMINAL
FIGURE 34. SKIP MODE OPERATION WAVEFORMS
Frequency Adjust
Negative Current Protection
The frequency of operation is fixed at 2MHz when FS is tied to VIN.
Adjustable frequency ranges from 500kHz to 4MHz using a simple
resistor connecting FS to SGND according to Equation 1:
Similar to overcurrent, the negative current protection is realized
by monitoring the current across the low-side NFET, as shown in
Figure 3 on page 5. When the valley point of the inductor current
reaches -3A for four consecutive cycles, both PFET and NFET are
off. The 100Ω in parallel to the NFET will activate discharging the
output into regulation. The control will begin to switch when output
is within regulation. The regulator will be in PFM for 20µs before
switching to PWM if necessary.
220  10 3
R FS  k  = ------------------------------ – 14
f OSC  kHz 
(EQ. 1)
The ISL78233, ISL78234 also has frequency synchronization
capability by simply connecting the SYNC pin to an external
square pulse waveform. The frequency synchronization feature
will synchronize the positive edge trigger and its switching
frequency up to 4MHz. The minimum external SYNC frequency is
half of the free running frequency (either the default frequency or
determined by the FS resistor).
Overcurrent Protection
The overcurrent protection is realized by monitoring the CSA
output with the OCP comparator, as shown in Figure 3 on page 5.
The current sensing circuit has a gain of 200mV/A, from the P-FET
current to the CSA output. When the CSA output reaches the
threshold, the OCP comparator is tripled to turn off the PFET
immediately. The overcurrent function protects the switching
converter from a shorted output by monitoring the current flowing
through the upper MOSFET.
Upon detection of an overcurrent condition, the upper MOSFET
will be immediately turned off and will not be turned on again
until the next switching cycle. Upon detection of the initial
overcurrent condition, the overcurrent fault counter is set to 1. If,
on the subsequent cycle, another overcurrent condition is
detected, the OC fault counter will be incremented. If there are
17 sequential OC fault detections, the regulator will be shut down
under an overcurrent fault condition. An overcurrent fault
condition will result in the regulator attempting to restart in a
hiccup mode within the delay of eight soft-start periods. At the
end of the eighth soft-start wait period, the fault counters are
reset and soft-start is attempted again. If the overcurrent
condition goes away during the delay of eight soft-start periods,
the output will resume back into regulation point after hiccup
mode expires.
FN8359 Rev 8.00
Apr 19, 2018
PG
PG is an open-drain output of a window comparator that
continuously monitors the buck regulator output voltage. PG is
actively held low when EN is low and during the buck regulator
soft-start period. After 1ms delay of the soft-start period, PG
becomes high impedance as long as the output voltage is within
nominal regulation voltage set by VFB. When VFB drops 15% below
or raises 0.8V above the nominal regulation voltage, the ISL78233,
ISL78234 pulls PG low. Any fault condition forces PG low until the
fault condition is cleared by attempts to soft-start. For logic level
output voltages, connect an external pull-up resistor, R1, between
PG and VIN. A 100kΩ resistor works well in most applications.
UVLO
When the input voltage is below the Undervoltage Lockout
(UVLO) threshold, the regulator is disabled.
Soft Start-Up
The soft start-up reduces the inrush current during the start-up.
The soft-start block outputs a ramp reference to the input of the
error amplifier. This voltage ramp limits the inductor current as
well as the output voltage speed, so that the output voltage rises
in a controlled fashion. When VFB is less than 0.1V at the
beginning of the soft-start, the switching frequency is reduced to
200kHz so that the output can start-up smoothly at light load
condition. During soft-start, the IC operates in Skip mode to
support prebiased output condition.
Tie SS to SGND for internal soft-start is approximately 1ms.
Connect a capacitor from SS to SGND to adjust the soft-start
time. This capacitor, along with an internal 2.1µA current source
Page 14 of 21
ISL78233, ISL78234
sets the soft-start interval of the converter, tSS as shown by
Equation 2.
C SS  F  = 3.1  t SS  s 
(EQ. 2)
CSS must be less than 33nF to insure proper soft-start reset after
fault condition.
Enable
The Enable (EN) input allows the user to control the turning on or
off of the regulator for purposes such as power-up sequencing.
When the regulator is enabled, there is typically a 600µs delay
for waking up the bandgap reference and then the soft start-up
begins. EN should be held below the EN_VIL until VIN exceeds
VUVLO rising.
Discharge Mode (Soft-Stop)
When a transition to shutdown mode occurs or the VIN UVLO is
set, the outputs discharge to GND through an internal 100Ω
switch.
Power MOSFETs
The power MOSFETs are optimized for best efficiency. The
ON-resistance for the PFET is typically 35mΩ and the
ON-resistance for the NFET is typically 11mΩ.
The inductor’s saturation current rating needs to be at least
larger than the peak current. The ISL78233, ISL78234 protects
the typical peak current 4.9A/6.7A. The saturation current needs
to be over 7A for maximum output current application.
The ISL78233, ISL78234 uses an internal compensation
network and the output capacitor value is dependent on the
output voltage. The recommended ceramic capacitor is X5R or
X7R. The recommended X5R or X7R minimum output capacitor
values are shown in Table 2 on page 4.
In Table 2, the minimum output capacitor value is given for the
different output voltages to make sure that the whole converter
system is stable. Additional output capacitance should be added
for better performance in applications where high load transient
or low output ripple is required. It is recommended to check the
system level performance along with the simulation model.
Output Voltage Selection
The output voltage of the regulator can be programmed using an
external resistor divider that is used to scale the output voltage
relative to the internal reference voltage, and feed it back to the
inverting input of the error amplifier (see Figure 2 on page 4).
The output voltage programming resistor, R2, will depend on the
value chosen for the feedback resistor and the desired output
voltage of the regulator. The value for the feedback resistor, R3,
is typically between 10kΩ and 100kΩ, as shown in Equation 4.
100% Duty Cycle
VO
R 2 = R 3  ------------ – 1
 VFB

(EQ. 4)
The ISL78233, ISL78234 features 100% duty cycle operation to
maximize the battery life. When the battery voltage drops to a
level that the ISL78233, ISL78234 can no longer maintain the
regulation at the output, the regulator completely turns on the
P-FET. The maximum dropout voltage under the 100% duty-cycle
operation is the product of the load current and the
ON-resistance of the PFET.
If the output voltage desired is 0.6V, then R3 is left unpopulated
and R2 is shorted. There is a leakage current from VIN to PHASE.
It is recommended to preload the output with 10µA minimum.
For better performance, add 15pF in parallel with R2 (200kΩ).
Check loop analysis before use in application.
Thermal Shutdown
Input Capacitor Selection
The ISL78233, ISL78234 has built-in thermal protection. When the
internal temperature reaches +150°C, the regulator is completely
shut down. As the temperature drops to +125°C, the ISL78233,
ISL78234 resumes operation by stepping through the soft-start.
The main functions for the input capacitor are to provide
decoupling of the parasitic inductance and to provide a filtering
function to prevent the switching current flowing back to the
battery rail. At least two 22µF X5R or X7R ceramic capacitors are
a good starting point for the input capacitor selection.
Applications Information
Loop Compensation Design
Output Inductor and Capacitor Selection
To consider steady state and transient operations, the ISL78233,
ISL78234 typically uses a 1.0µH output inductor. The higher or
lower inductor value can be used to optimize the total converter
system performance. For example, for higher output voltage 3.3V
application, in order to decrease the inductor current ripple and
output voltage ripple, the output inductor value can be increased.
It is recommended to set the ripple inductor current to
approximately 30% of the maximum output current for optimized
performance. The inductor ripple current can be expressed as
shown in Equation 3:
VO 

V O   1 – ---------
V IN

I = --------------------------------------L  fS
FN8359 Rev 8.00
Apr 19, 2018
(EQ. 3)
When COMP is not connected to VDD, the COMP pin is active for
external loop compensation. The ISL78233, ISL78234 uses
constant frequency peak current mode control architecture to
achieve a fast loop transient response. An accurate
current-sensing pilot device in parallel with the upper MOSFET is
used for peak current control signal and overcurrent protection.
The inductor is not considered as a state variable since its peak
current is constant, and the system becomes a single order
system. It is much easier to design a type II compensator to
stabilize the loop than to implement voltage mode control. Peak
current mode control has an inherent input voltage feed-forward
function to achieve good line regulation. Figure 35 on page 16
shows the small signal model of the synchronous buck regulator.
Page 15 of 21
ISL78233, ISL78234
+
^
i in
^
Vin
ILd^
^
iL
LP
RLP
The loop gain at crossover frequency of fc has a unity gain.
Therefore, the compensator resistance R6 is determined by
Equation 6.
Vin d^
1:D
+
Rc
RT
GAIN (VLOOP (S(fi))
The compensator design procedure is as follows:
^
vo
2f c V o C o R t
3
R 6 = ---------------------------------- = 17.45 10  f c V o C o
GM  V FB
Ro
Co
T i(S)
d^
K
Fm
+
Tv (S)
He(S)
v^comp
-Av(S)
FIGURE 35. SMALL SIGNAL MODEL OF SYNCHRONOUS BUCK
REGULATOR
(EQ. 6)
where GM is the sum of the transconductance, gm, of the voltage
error amplifier in each phase. Compensator capacitor C6 is then
given by Equation 7.
Ro Co Vo Co
Rc Co 1
C 6 = --------------- = --------------- ,C 7 = max (--------------,----------------)
R6
Io R6
R 6 f s R 6
(EQ. 7)
Place one compensator pole at zero frequency to achieve high
DC gain, and put another compensator pole at either ESR zero
frequency or half switching frequency, whichever is lower in
Equation 7. An optional zero can boost the phase margin. CZ2 is
a zero due to R2 and C3
Place compensator zero 2 to 5 times fc :
1
C 3 = ---------------f c R 2
Vo
R2
Example: VIN = 5V, VO = 1.8V, IO = 4A, FS = 1MHz, R2 = 200kΩ,
R3 = 100kΩ, Co = 2x22µF/3mΩ, L = 1µH, fc = 100kHz, then
compensator resistance R6:
C3
VFB
R3
VREF
(EQ. 8)
GM
3
R 6 = 17.45 10  100kHz  1.8V  44F = 138k
VCOMP
(EQ. 9)
It is acceptable to use 137kΩas theclosest standard value for
R6.
+
R6
C7
C6
FIGURE 36. TYPE II COMPENSATOR
Figure 36 shows the type II compensator and its transfer function
is expressed as Equation 5:
S
S 
 1 + ------------ 1 + -------------

GM  R 3
 cz2
 cz1 
v̂ comp
A v  S  = ----------------- = -------------------------------------------------------- -------------------------------------------------------------- C6 + C7    R2 + R3  
S
S
v̂ FB
S 1 + -------------  1 + -------------

 cp1 
 cp2
(EQ. 5)
where,
R2 + R3
C6 + C7
1
1
 cz1 = --------------- ,  cz2 = ---------------  cp1 = -----------------------  cp2 = ----------------------R6 C6 C7
C3 R2 R3
R6 C6
R2 C3
1.8V  44 F
C 6 = -------------------------------- = 144pF
4A  137k
(EQ. 10)
3m  44F
1
C 7 = max (---------------------------------,------------------------------------------------) = (1pF,2.3pF)
137k
  1MHz  137k 
(EQ. 11)
It is also acceptable to use the closest standard values for C6 and
C7. There is approximately 3pF parasitic capacitance from VCOMP
to GND; Therefore, C7 is optional. Use C6 = 150pF and C7 = OPEN.
1
C 3 = ------------------------------------------------ = 16pF
100kHz  200k
(EQ. 12)
Use C3 = 15pF. Note that C3 may increase the loop bandwidth
from previous estimated value. Figure 37 on page 17 shows the
simulated voltage loop gain. It is shown that it has a 150kHz loop
bandwidth with a 42° phase margin and 10dB gain margin. It
may be more desirable to achieve an increased phase margin.
This can be accomplished by lowering R6 by 20% to 30%.
Compensator design goal:
High DC gain
Choose loop bandwidth fc less than 100kHz
Gain margin: >10dB
Phase margin: >40°
FN8359 Rev 8.00
Apr 19, 2018
Page 16 of 21
ISL78233, ISL78234
PCB Layout Recommendation
60
GAIN (VLOOP (S(fi))
45
30
15
0
-15
-30
100
1k
10k
f (fi)
1k
10k
f (fi)
100k
1M
180
PHASE (VLOOP (S(fi))
150
The PCB layout is a very important converter design step to make
sure the designed converter works well. For the ISL78233,
ISL78234 the power loop is composed of the output inductor L’s,
the output capacitor CO, the PHASE pins, and the PGND pin. It is
necessary to make the power loop as small as possible and the
connecting traces among them should be direct, short, and wide.
The switching node of the converter, the PHASE pins and the
traces connected to the node are very noisy, so keep the voltage
feedback trace away from these noisy traces. Place the input
capacitor as close as possible to the VIN pin. Connect the ground
of the input and output capacitors as close as possible. The heat
of the IC is mainly dissipated through the thermal pad.
Maximizing the copper area connected to the thermal pad is
preferable. In addition, a solid ground plane is helpful for better
EMI performance. Refer to TB389 for via placement on the
copper area of the PCB underneath the thermal pad for optimum
thermal performance.
120
90
60
30
0
100
100k
1M
FIGURE 37. SIMULATED LOOP GAIN
FN8359 Rev 8.00
Apr 19, 2018
Page 17 of 21
ISL78233, ISL78234
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest revision.
DATE
REVISION
CHANGE
Apr 19, 2018
FN8359.8
Updated Related Literature section.
Updated Ordering Information table by adding tape and reel information, Note 3, and updating Note 1.
Adding Note 8 and its cross-referencing on page 7.
Added symbol name “EN_VIL” to the Logic Input Low parameter and the symbold name “EN_VIH” to the Logic
Input High parameter on page 7.
Updated Enable section on page 14.
Removed About Intersil section and updated disclaimer.
Dec 4, 2015
FN8359.7
Added a new User Guide to Related Literature section on page 1.
Added EVAL2 part numbers to the ordering information table on page 3.
Added Table 1 on page 3.
Nov 10, 2015
FN8359.6
Added 5x5mmWFQFN information throughout datasheet.
Updated Note 1 on page 3 from “Add “-T*” suffix for tape and reel.” to “Add “-T” suffix for 6k unit or “-T7A” suffix
for 250 unit tape and reel options.”
In “PWM Control Scheme” on page 13 (last sentence) corrected a typo by changing “1.6V to “2.5V”.
Table 2 on page 4: Updated L1 row.
Updated the “PCB Layout Recommendation” section on page 17.
Added POD L16.5x5D.
Apr 23, 2015
FN8359.5
Updated the 4th Features bullet page 1 by changing value from “0.8%” to “-1.2%/1%”.
Apr 23, 2014
FN8359.4
Updated electrical table, changed Phase minimum on-time MAX from 133ns to 100ns on page 7
Updated electrical table, modified test conditions for Error Amplifier trans-conductance and Power-good
Output Low Voltage on page 7
Removed references to VOUT = 0.8V, and 0.9V
Added typical curve for Phase minimum on-time vs VIN on page 9
Added description on synchronized control on page 14
Feb 24, 2014
FN8359.3
Updated ESD rating qual references from Jedec standard references to AEC-Q100 standard references on
page 6
Dec 13, 2013
FN8359.2
Last Features bullet on page 1: changed from “Qualified for automotive application” to “AEC-Q100 qualified”
Oct16, 2013
FN8359.1
Initial Release.
FN8359 Rev 8.00
Apr 19, 2018
Page 18 of 21
ISL78233, ISL78234
Package Outline Drawings
For the most recent package outline drawing, see L16.3x3D.
L16.3x3D
16 LEAD THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 0, 3/10
4X 1.50
3.00
A
12X 0.50
B
13
6
PIN 1
INDEX AREA
16
6
PIN #1
INDEX AREA
12
3.00
1
1.60 SQ
4
9
(4X)
0.15
8
0.10 M C A B
5
16X 0.40±0.10
TOP VIEW
4 16X 0.23 ±0.05
BOTTOM VIEW
SEE DETAIL “X”
0.10 C
0.75 ±0.05
C
0.08 C
SIDE VIEW
(12X 0.50)
(2.80 TYP) (
1.60)
(16X 0.23)
C
0 . 2 REF
5
0 . 02 NOM.
0 . 05 MAX.
(16X 0.60)
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to ASME 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 0.25mm 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
7.
JEDEC reference drawing: MO-220 WEED.
either a mold or mark feature.
FN8359 Rev 8.00
Apr 19, 2018
Page 19 of 21
ISL78233, ISL78234
L16.5x5D
For the most recent package outline drawing, see L16.5x5D.
16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (PUNCH QFN WITH WETTABLE FLANK)
Rev 2, 5/14
A
0.10 C A (2X)
5.00
4.75
16
0.10 M C A B
2.8
0.60 MAX. (4X)
PIN 1 ID
R0.20
16
0.10 C B (2X)
0.60 MAX. (4X)
0.45
0.10 M C B A
1
5
0.50 DIA
1
5.00
2
2
2.8
4.75
3
3
(0.70)
CC
(2X)
0.10 C B
(2X)
0.40±0.10
0.15±0.10
0.10 C A
B
TOP VIEW
// 0.10 C
0.85 ± 0.05
TERMINAL TIP 4
0.30±0.05
0.10 M C A B
0.05 M C
(0.70)
0.08 C
0.80
5
BOTTOM VIEW
+ 0.04
0.01 - 0.01
0.65 ± 0.05
(0.20)
0.20
0.10
4
SEE DETAIL “A”
(0.01)
SECTION “C-C”
SCALE: NONE
12° MAX
4
DETAIL “A” (DIMPLE DEPTH)
SCALE: NONE
SEATING PLANE
C
SIDE VIEW
NOTES:
12X (0.80)
1. Dimensions are in millimeters.
Dimensions in ( ) are for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
(2.80) SQ
3. Unless otherwise specified, tolerance: Decimal ± 0.05
(4.80) SQ
4. Dimension applies to the plated terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
16X (0.30)
16X (0.60)
TYPICAL RECOMMENDED LAND PATTERN
FN8359 Rev 8.00
Apr 19, 2018
5. 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.
6.
Reference document: JEDEC M0220.
Page 20 of 21
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