Intersil ISL8272MEVAL1Z User manual

1
User Guide 003
lSL8272MEVAL1Z Evaluation Board User Guide
Description
The ISL8272M is a 50A step-down DC/DC power supply
module with an integrated digital PWM controller, dual-phase
synchronous power switches, inductors and passives. Only
input output capacitors and minimal passives are needed to
finish the design. 50A of continuous output current can be
delivered without a need of airflow or heatsink. The ISL8272M
uses ChargeMode™ control (ASCR) architecture, which
responds to a transient load within a single switching cycle.
The ISL8272MEVAL1Z evaluation board is a 4.7in x 4.8in
6-layer FR4 board with 2oz. copper in all layers. This evaluation
board comes with placeholders for pin-strap resistor
population to adjust output voltage, switching frequency, soft-
start/stop timing and input UVLO threshold, ASCR gain and
residual parameters and device PMBus™ address. More
configurations, such as sequencing, Digital-DC™ (DDC) bus
configuration and fault limits can be easily programmed or
changed via PMBus compliant serial bus interface.
ZLUSBEVAL3Z (USB to PMBus adapter) is provided with this
evaluation kit, which connects the evaluation board to a PC to
activate the PMBus communication interface. The PMBus
command set is accessed by using the PowerNavigator™
evaluation software from a PC running Microsoft Windows.
References
ISL8272M datasheet
Key Features
•V
IN range of 4.5V to 14V, VOUT adjustable from 0.6V to 5V
•ProgrammableV
OUT, margining, input and output UVP/OVP,
IOUT limit, OTP/UTP, soft-start/stop, sequencing, and
external synchronization
• Monitor: VIN, VOUT, IOUT, temperature, duty cycle, switching
frequency and faults
•ChargeMode™
control tunable with PMBus
• Mechanical switch for enable and power-good LED indicator
Specifications
This board has been configured for the following operating
conditions by default:
•V
IN = 5V to 12V
•V
OUT = 1.2V
•I
MAX = 50A
•f
SW = 421kHz
• Peak efficiency: >90.5% at 70% load
• Output ripple: <10mVP-P
• ASCR gain = 200, ASCR residual = 90
• On/off delay = 5ms; On/off ramp time = 5ms
Ordering Information
PART NUMBER DESCRIPTION
ISL8272MEVAL1Z ISL8272M Kit (Evaluation Board,
ZLUSBEVAL3Z Adapter, USB Cable)
FIGURE 1. TOP SIDE
INTERCONNECTS DDC AND
SYNC BETWEEN BOARDS
CONNECT TO ZLUSBEVAL3Z
DONGLE. FOR MULTIPLE
BOARD EVALUATION,
CONNECT TO PMBus DONGLE
OUT CONNECTION OF OTHER
BOARD
INTERCONNECTS DDC AND SYNC
BETWEEN BOARDS
TO DAISY CHAIN PMBus
CONNECTION
PGOOD LED
ENABLE SWITCH
VOUT REGULATION MONITOR
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design), PowerNavigator, ChargeMode and Digital-DC are trademarks owned by Intersil Corporation or
one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.

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Recommended Equipment
• DC power supply with minimum 15V/25A sourcing capacity
• Electronic load capable of sinking current up to 50A
• Digital multimeters (DMMs)
• Oscilloscope with higher than 100MHz bandwidth
Functional Description
The ISL8272MEVAL1Z provides all circuitry required to evaluate
the features of the ISL8272M. A majority of the features of the
ISL8272M, such as compensation-free ChargeMode™ control,
soft-start delay and ramp times, supply sequencing, and voltage
margining are available on this evaluation board. For sequencing
evaluation, the board can be connected to any Intersil digital
module evaluation board that supports the DDC bus.
Figures 1 and 2show the board images of the ISL8272MEVAL1Z
evaluation board.
Quick Start Guide
Pin-Strap Option
ISL8272MEVAL1Z can be configured in pin-strap mode with
standard 1% 0603 resistors. PMBus interface is not required to
evaluate ISL8272M in pin-strap mode. Output voltage (VOUT),
switching frequency (fSW), soft-start/stop delay and ramp time,
input undervoltage protection (UVLO) threshold, ASCR gain and
residual, and device PMBus address can be changed by
populating recommended resistors at placeholders provided in
the evaluation board. By default, the evaluation board operates
in pin-strap mode and regulates at VOUT = 1.2V, fSW = 421kHz,
soft-start/stop delay time = 5ms, soft-start/stop ramp
time = -5ms, UVLO = 4.5V, ASCR gain = 200, ASCR residual = 90
and PMBus address = 28h. Follow these steps to evaluate
ISL8272M in pin-strap mode.
1. Set ENABLE switch to “DISABLE”.
2. Connect Load to VOUT lug connectors (J7-J8 and J9-J10).
3. Connect power supply to VIN connectors (J5 and J6). Make
sure power supply is not enabled when making connection.
4. Turn power supply on.
5. Set ENABLE switch to “ENABLE”.
6. Measure 1.2V VOUT at probe point labeled “VOUT
REGULATION MONITOR” (J11).
7. Observe switching frequency of 421kHz at probe points
labeled “PHASE1” (TP10) and “PHASE2” (TP11).
8. To measure the module efficiency, connect the multimeter
voltage probes at probe points labeled “VIN” (TP1), “GND”
(TP2) and “VOUT” (TP12).
9. To change VOUT, disconnect board from the setup and
populate a 1% standard 0603 resistor at RVSET placeholder
location on bottom layer. Refer to the “Output Voltage
Resistor Settings” table in the ISL8272M datasheet for
recommended values. By default, VOUT_MAX is set to 110%
of VOUT set by pin-strap resistor.
10. To change switching frequency, disconnect board from the
setup and populate a 1% standard 0603 resistor at RFSET
placeholder location on bottom layer. Refer to the “Switching
Frequency Resistor Settings” table in the ISL8272M
datasheet for recommended values.
11. To change soft-start/stop delay and ramp time, disconnect
board from the setup and populate a 1% standard 0603
resistor at R6 placeholder location on bottom layer. Refer to
the “Soft Start/Stop Resistor Settings” table in the ISL8272M
datasheet for recommended values.
12. To change UVLO, disconnect board from the setup and
populate a 1% standard 0603 resistor at R6 placeholder
location on bottom layer. Refer to the “UVLO Resistor Settings”
table in the ISL8272M datasheet for recommended values.
Notice that the UVLO programming shares the same pin with
soft-start/stop programming.
13. To change ASCR gain and residual, disconnect board from the
setup and populate a 1% standard 0603 resistor at R7
placeholder location on bottom layer. Refer to the “ASCR
FIGURE 2. BOTTOM SIDE
RESISTOR PLACEHOLDERS

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Resistor Settings” table and the design guide matrix in the
ISL8272M datasheet for recommended values.
PMBus Option
ISL8272MEVAL1Z can be evaluated for all features using the
provided ZLUSBEVAL3Z dongle and PowerNavigator™ evaluation
software. Follow these steps to evaluate ISL8272M with PMBus
option.
1. Install PowerNavigator™ software from the following Intersil
website: www.intersil.com/powernavigator
2. Set ENABLE switch to “DISABLE”.
3. Connect Load to VOUT lug connectors (J7-J8 and J9-J10).
4. Connect power supply to VIN connectors (J5 and J6). Make
sure power supply is not enabled when making connection.
5. Turn power supply on.
6. Connect ZLUSBEVAL3Z dongle (USB to PMBus™ adapter) to
ISL8272MEVAL1Z board to the 6-pin male connector labeled
as “PMBus DONGLE IN”.
7. Connect supplied USB cable from computer USB to
ZLUSBEVAL3Z dongle.
8. Launch PowerNavigator™ software.
9. It is optional to load a predefined set-up from a configuration
file using the PowerNavigator™ software. The ISL8272M
device on the board operates in pin-strap mode from factory
default, but the user may modify the operating parameters
through the evaluation software or by loading a predefined
set-up from a configuration file. A sample “Configuration File”
on page 6 is provided and can be copied to a notepad editor
to make desired changes. The default pin-strap
configurations will be overwritten if a user-defined
configuration file is loaded.
10. Set ENABLE switch to “ENABLE”. Alternatively, the PMBus
ON_OFF_CONFIG and OPERATION commands may be used
from the PowerNavigator™ software to allow PMBus Enable.
11. Monitor and configure the ISL8272MEVAL1Z board using the
PMBus commands in the evaluation software. To store the
configuration changes, disable the module and use the
command STORE_USER_ALL. To restore factory default
settings, disable the module and use the command
RESTORE_FACTORY and STORE_USER_ALL.
12. PowerNavigator™ tutorial videos are available at Intersil
website. www.intersil.com/powernavigator
13. For sequencing via Digital-DC Bus (DDC) or to evaluate
multiple Intersil digital power products using a single
ZLUSBEVAL3Z dongle, ISL8272M can be daisy chained with
other digital power evaluation boards. PMBus address can be
changed by placing a 1% standard 0603 resistor at the R4
placeholder location on the bottom layer. Refer to the “SMBus
Address Resistor Selection” table in the ISL8272M datasheet
for recommended values.
Thermal Considerations and
Current Derating
Board layout is very critical in order to make the module operate
safely and deliver maximum allowable power. To work in the high
temperature environments and carry large currents, the board
layout needs to be carefully designed to maximize thermal
performance. To achieve this, select enough trace width, copper
weight and the proper connectors.
The ISL8272MEVAL1Z evaluation board is designed for running
50A at room temperature without additional cooling systems
needed. However, if the output voltage is increased or the board
is operated at elevated temperatures, then the available current
is derated. Refer to the derated current curves in the ISL8272M
datasheet to determine the maximum output current the
evaluation board can supply. JA is measured by inserting a
thermocouple inside the module to measure peak junction
temperature.

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ISL8272MEVAL1Z Schematic
RELEASED BY:
DRAWN BY: DATE:
DATE:
DATE:
TESTER
DATE:ENGINEER:
TITLE:
UPDATED BY:
08/05/2014
TIM KLEMANN
EVAN JIANG
SCHEMATIC
EVALUATION BOARD
EVAN JIANG
ISL8272M 50A
07/31/2014
COMMUNICATION CONNECTION
TO SEQUEL
INTER-DEVICE CONNECTION
TO SEQUEL
FROM PREQUEL
DISABLE
GND
UNDER DUT
PGND TIED TO SGND
ENABLE
GND
FROM PREQUEL
DDC
DDC
EN
PG
PHASE1
PHASE2
SA
SALRT
SALRT
SCL
SCL
SDA
SDA
SYNC
SYNC UNNAMED_1_CONN6_I259_IN2
UNNAMED_1_CONN6_I259_IN5UNNAMED_1_CONN6_I259_IN6
UNNAMED_1_GTSERIES_I236_NC
UNNAMED_1_NCHANNEL_I231_D
UNNAMED_1_SMRES_I197_B
UNNAMED_1_SMRES_I198_B
UNNAMED_1_SMRES_I204_B
UNNAMED_1_SMRES_I246_B
UNNAMED_1_SMRES_I247_B
UNNAMED_1_SMRES_I282_A
UNNAMED_1_SMRES_I283_A
SS/UVLO
V25
VCC
VCC
VCC
VCC
VCC
VI2C
VIN
VMON
VOUT
VR5
VR55
VR6
100UF
C23
10UF
C17
DNP
R4
200
R13
10UF
C11
C21
100UF
100UF
C13
0.1UF
C1
TP7
C18
470UF
TP2
12
J11
TP8
DNP
R5
100UF
C14
SW1
1
2
3
C24
470UF
TP6
22UF
C4
VDRV1
VDRV1
EN
NC
VOUT
VSENP
VSENN
VOUT
NC
NC
PG
ASCR
VDRV
VDRV
SS/UVLO
CS
MGN
PGND PGND PGND
VCC
V25
VR5 VR6
SWD2
SWD1
SW1
PGND
SW2
PGND
PGND
PGND
PGND
PGND
VMON
SGND
SGND
SGND
SGND
SGND
DDC
SYNC
SA
PGND PGND
VIN VIN VIN
VR
VR55
SCL
SDA
SALRT
NC
NC
NC
VSET
VDD
U1
ISL8272MIRZ
PAD6
M14
K16
J16
H16
C9
D4
C7
C8
C5
C6
G4
F4
D13
E4
C10
C11
C12
C13
PAD8
N6 PAD9
N16 PAD11
M1
G15 K14
L14
M13 L2
M10
PAD10 PAD12 R8
M5 R17
M17
N5 E14
D14
G14
D5
F15
E15
PAD15
PAD16
P11
PAD7
PAD4
PAD2
H3
H4
PAD13
PAD14
L3
PAD5
PAD3
PAD1
Q1
2N7002L
1
2
3
C6
22UF
TP12
J5
470UF
C25
TP5
470UF
C19
TP1
R12
0
R6
DNP
100UF
C15
J6
J10
10UF
C8
1.5K
R8
RFSET
DNP
10UF
C12
0
R11
22UF
C7
3
5
12
4
6
J2
1 2
3 4
5 6
6.65K
R2
R7
DNP
J9
100UF
C20
TP3
C22
100UF
TP4
3
5
12
4
6
J1
1 2
3 4
5 6
100K
R1
R10 10K
J8
C26
22UF
1.5K
R9
3
5
12
4
6
J4
1 2
3 4
5 6
100UF
C16
4.75K
R3
TP11
J7
10UF
C9
RVSET
DNP
TP9
3
5
12
4
6
J3
1 2
3 4
5 6
22UF
C2
C3
470UF
22UF
CVSEN
10UF
C10
RED GRN
D1
12 34
22UF
C5
TP10

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Bill of Materials
REFERENCE DESIGNATORS QTY MANUFACTURER MANUFACTURER PART DESCRIPTION
C1 1 PANASONIC ECJ-2VB1E104K CAP, SMD, 0805, 0.1µF, 25V, 10%, X7R, ROHS
CVSEN 1 TDK C2012X5R0J226M CAP, SMD, 0805, 22µF, 6.3V, 20%, X5R, ROHS
C8, C10-C12, C17 5 VENKEL C1206X7R100-106KNE CAP, SMD, 1206, 10µF, 10V, 10%, X7R, ROHS
C9 1 VENKEL C1206X7R250-106KNE CAP, SMD, 1206, 10µF, 25V, 10%, X7R, ROHS
C13, C14, C15, C16, C22, C23 6 MURATA GRM31CR60J107ME39L CAP, SMD, 1206, 100µF, 6.3V, 20%, X5R,
ROHS
C20, C21 0 CAP, SMD, 1206, DNP-PLACEHOLDER, ROHS
C2, C4, C5, C6, C7, C26 6 MURATA GRM32ER71C226KE18L CAP, SMD, 1210, 22µF, 16V, 10%, X7R, ROHS
C24, C25 2 SANYO 6TPE470MI CAP-POSCAP, LOW ESR, SMD, D4, 470µF, 6.3V,
20%, 18mΩ, ROHS
C3 1 PANASONIC EEE-1EA471P CAP, SMD, 10mm, 470µF, 25V, 20%,
ALUM.ELEC., 380mA, ROHS
J5, J6 2 JOHNSON COMPONENTS 108-0740-001 CONN-JACK, BANANA-SS-SDRLESS, VERTICAL,
ROHS
TP1-TP4, TP9-TP12 8 KEYSTONE 5005 CONN-COMPACT TEST PT, VERTICAL,RED,
ROHS
J11 1 BERG/FCI 69190-202HLF CONN-HEADER, 1X2, RETENTIVE, 2.54mm,
0.230 x 0.120, ROHS
J2, J4 2 SAMTEC SSQ-103-02-T-D-RA CONN-SOCKET STRIP, TH, 2x3, 2.54mm, TIN,
R/A, ROHS
J1, J3 2 SAMTEC TSW-103-08-T-D-RA CONN-HEADER, 2x3, BRKAWY, 2.54mm, TIN,
R/A, ROHS
D1 1 LUMEX SSL-LXA3025IGC-TR LED, SMD, 3x2.5mm, 4P, RED/GREEN,
12/20MCD, 2V
U1 1 INTERSIL ISL8272MAIRZ IC-50A DIGITAL DC/DC MODULE, 42P, HDA,
ROHS
Q1 1 ON SEMICONDUCTOR 2N7002LT1G TRANSISTOR-MOS, N-CHANNEL, SMD, SOT23,
60V, 115mA, ROHS
R4, R5, R6, R7, RFSET, RVSET 0 RESISTOR, SMD, 0603, 0.1%, MF,
DNP-PLACEHOLDER
R11, R12 2 VENKEL CR0603-10W-000T RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS
R10 1 KOA RK73H1JT1002F RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
R1 1 VENKEL CR0603-10W-1003FT RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
R8, R9 2 VENKEL CR0603-10W-1501FT RES, SMD, 0603, 1.5k, 1/10W, 1%, TF, ROHS
R3 1 VENKEL CR0603-10W-4751FT RES, SMD, 0603, 4.75k, 1/10W, 1%, TF, ROHS
R2 1 YAGEO RC0603FR-076K65L RES, SMD, 0603, 6.65k, 1/10W, 1%, TF, ROHS
R13 1 PANASONIC ERJ-8ENF2000V RES, SMD, 1206, 200Ω, 1/4W, 1%, TF, ROHS
SW1 1 C&K COMPONENTS GT13MCBE SWITCH-TOGGLE, THRU-HOLE, 5PIN, SPDT,
3POS, ON-OFF-ON, ROHS
J7, J8, J9, J10 4 BERG/FCI KPA8CTP HDWARE, MTG, CABLE TERMINAL, 6-14AWG,
LUG&SCREW, ROHS
C18, C19 0 DO NOT POPULATE
TP5, TP6, TP7, TP8 0 DO NOT POPULATE

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Configuration File
Sample Configuration File for ISL8272M Module. Copy and paste (from RESTORE_FACTORY TO ### End User Store) to a notepad and
save it as Confile_file_name.txt. The # symbol is used for a comment line. Following settings are already loaded to ISL8272M module
as factory defaults.
RESTORE_FACTORY # reset device to the factory setting
STORE_USER_ALL # Clears user memory space
# VOUT Related
VOUT_COMMAND 0x2666 # 1.2 V
VOUT_MAX 0x2a3c # 1.32 V
VOUT_MARGIN_HIGH 0x2851 # 1.26 V
VOUT_MARGIN_LOW 0x247a # 1.14 V
VOUT_OV_FAULT_LIMIT 0x2c28 # 1.38 V
VOUT_OV_FAULT_RESPONSE 0x80 # Disable and no retry
VOUT_OV_WARN_LIMIT 0x2a3c # 1.32 V
VOUT_UV_WARN_LIMIT 0x228f # 1.08 V
VOUT_UV_FAULT_LIMIT 0x20a3 # 1.02 V
VOUT_UV_FAULT_RESPONSE 0x80 # Disable and no retry
POWER_GOOD_ON 0x228f # 1.08 V
VOUT_TRANSITION_RATE 0xba00 # 1 mV/us
VOUT_DROOP 0x0000 # 0 mV/A
VOUT_CAL_OFFSET 0x0000 # 0 mV/A
# IOUT Related
IOUT_CAL_GAIN 0xb370 # 0.86 mV/A
IOUT_CAL_OFFSET 0x0000 # 0 A
IOUT_OC_FAULT_LIMIT 0xe3c0 # 60 A
IOUT_UC_FAULT_LIMIT 0xe440 # -60A
MFR_IOUT_OC_FAULT_RESPONSE 0x80 # Disable and no retry
MFR_IOUT_UC_FAULT_RESPONSE 0x80 # Disable and no retry
ISENSE_CONFIG 0x05 # 256ns Blanking time, Mid-Range
# Other Faults
OT_FAULT_LIMIT 0xebe8 # 125 °C
OT_FAULT_RESPONSE 0x80 # Disable and no retry
OT_WARN_LIMIT 0xeb70 # 110 °C
UT_WARN_LIMIT 0xdc40 # -30 °C
UT_FAULT_LIMIT 0xe530 # -45 °C
UT_FAULT_RESPONSE 0x80 # Disable and no retry
VIN_OV_FAULT_LIMIT 0xd380 # 14 V
VIN_OV_FAULT_RESPONSE 0x80 # Disable and no retry
VIN_OV_WARN_LIMIT 0xd353 # 13.3 V
VIN_UV_WARN_LIMIT 0xca5d # 4.73 V
VIN_UV_FAULT_LIMIT 0xca40 # 4.5 V
VIN_UV_FAULT_RESPONSE 0x80 # Disable and no retry
#Enable, Timing and Sequence Related
ON_OFF_CONFIG 0x16 # Pin Enable, Soft Off
TON_DELAY 0xca80 # 5 ms
TON_RISE 0xca80 # 5 ms
TOFF_DELAY 0xca80 # 5 ms
TOFF_FALL 0xca80 # 5 ms
POWER_GOOD_DELAY 0xca00 # 4 ms
FREQUENCY_SWITCH 0x0215 # 533 kHz
SYNC_CONFIG 0x00 # Use Pin-strap for FSW setting
SEQUENCE 0x0000 # Sequence Disabled
# Manufacturer Related
MFR_ID Intersil Corp # Example Only
MFR_MODEL ISL8272MEVAL1Z # Example Only
MFR_REVISION Rev-1 # Example Only
MFR_LOCATION Milpitas, CA # Example Only
MFR_DATE 09/05/2014 # Example Only
MFR_SERIAL 1234 # Example Only
USER_DATA_00 Module # Example Only
# Advance Settings
USER_CONFIG 0x80 # ASCR on for Start, Open Drain PG
DDC_CONFIG 0x0a01 # DDC rail ID = 10, 2-phase
DDC_GROUP 0x00000000 # All Broadcast disabled
# Loop Compensation
ASCR_CONFIG 0x15a0100 # ASCR gain = 256, Residual = 90
STORE_USER_ALL # Store all above settings to NVRAM
### End User Store

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Layout
FIGURE 3. SILKSCREEN TOP
FIGURE 4. TOP LAYER COMPONENT SIDE

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FIGURE 5. LAYER 2
FIGURE 6. LAYER 3
Layout (Continued)

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FIGURE 7. LAYER 4
FIGURE 8. LAYER 5
Layout (Continued)

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FIGURE 9. BOTTOM LAYER SOLDER SIDE
FIGURE 10. SILKSCREEN BOTTOM
Layout (Continued)

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Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board.
FIGURE 11. OUTPUT CURRENT MEASUREMENT ACCURACY AT
VIN = 12V, VOUT = 1V, TA= +25°C FOR VARIOUS
SWITCHING FREQUENCIES
FIGURE 12. OUTPUT CURRENT MEASUREMENT ACCURACY AT
VIN = 12V, VOUT = 1V, fSW = 533kHz FOR VARIOUS
AMBIENT TEMPERATURES
FIGURE 13. OUTPUT CURRENT MEASUREMENT ACCURACY AT
VIN = 12V, VOUT = 3.3V, TA= +25°C FOR VARIOUS
SWITCHING FREQUENCIES
FIGURE 14. OUTPUT CURRENT MEASUREMENT ACCURACY AT
VIN = 12V, VOUT = 3.3V, fSW = 533kHz FOR VARIOUS
AMBIENT TEMPERATURES
FIGURE 15. EFFICIENCY vs OUTPUT CURRENT AT VIN = 12V,
fSW = 300kHz FOR VARIOUS OUTPUT VOLTAGES
FIGURE 16. EFFICIENCY vs SWITCHING FREQUENCY AT VIN = 12V,
IOUT = 50A FOR VARIOUS OUTPUT VOLTAGES
55
50
45
40
35
30
25
20
15
10
5
00 5 10 15 20 25 30 35 40 45 50 55
ACTUAL OUTPUT CURRENT (A)
MEASURED OUTPUT CURRENT (A)
300kHz
533kHz
421kHz
800kHz
55
50
45
40
35
30
25
20
15
10
5
00 5 10 15 20 25 30 35 40 45 50 55
ACTUAL OUTPUT CURRENT (A)
MEASURED OUTPUT CURRENT (A)
+45°C
+65°C
+25°C
300kHz
533kHz
421kHz 800kHz
55
50
45
40
35
30
25
20
15
10
5
00 5 10 15 20 25 30 35 40 45 50 55
ACTUAL OUTPUT CURRENT (A)
MEASURED OUTPUT CURRENT (A)
+45°C
+65°C
+25°C
55
50
45
40
35
30
25
20
15
10
5
00 5 10 15 20 25 30 35 40 45 50 55
ACTUAL OUTPUT CURRENT (A)
MEASURED OUTPUT CURRENT (A)
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
0 5 10 15 20 25 30 35 40 45 50
0.8V
1V
1.2V 1.8V 2.5V 3.3V
IOUT (A)
EFFICIENCY (%)
5V
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
0.98
300 350 400 450 500 550 600 650 700 750 800 850 900
SWITCHING FREQUENCY (kHz)
EFFICIENCY (%)
1V 1.2V
1.8V 2.5V 3.3V
0.8V
5V

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FIGURE 17. LOAD TRANSIENT RESPONSE AT VIN = 12V, VOUT = 1V,
IOUT = 0A TO 25A (>100A/μs), fSW = 533kHz.
COUT =8x100μF CERAMIC + 4 x 470μF POSCAP
FIGURE 18. LOAD TRANSIENT RESPONSE AT VIN = 12V, VOUT = 3.3V,
IOUT = 0A TO 25A (>100A/μs), fSW = 533kHz.
COUT =4x100μF CERAMIC + 2 x 470μF POSCAP
FIGURE 19. SOFT-START AT VIN = 12V, VOUT = 1.2V,
TON_DELAY = 5ms, TON_RISE = 5ms,
POWER_GOOD_DELAY = 4ms
FIGURE 20. SOFT-STOP AT VIN = 12V, VOUT = 1.2V,
TOFF_DELAY = 5ms, TOFF_FALL = 5ms
FIGURE 21. OUTPUT SHORT CIRCUIT PROTECTION AT VIN = 12V,
VOUT = 1.2V, fSW = 533kHz
FIGURE 22. OUTPUT OVERVOLTAGE PROTECTION AT VIN = 12V,
VOUT = 1.2V, fSW = 533kHz,
VOUT_OV_FAULT_LIMIT = 1.38V
Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued)
VOUT (50mV/DIV)
IOUT (25A/DIV)
20µs/DIV
ASCR GAIN = 550
RESIDUAL = 100
VOUT (50mV/DIV)
IOUT (25A/DIV)
50µs/DIV
ASCR GAIN = 220
RESIDUAL = 90
ENABLE
VOUT (1V/DIV)
POWER-GOOD
5ms/DIV
ENABLE
VOUT (1V/DIV)
POWER-GOOD
5ms/DIV
PHASE1 (10V/DIV)
PHASE2 (10V/DIV)
VOUT (1V/DIV)
IIN (5A/DIV)
10µs/DIV
PHASE1 (10V/DIV)
PHASE2 (10V/DIV)
VOUT (500mV/DIV)
20µs/DIV

User Guide 003
13 UG003.0
September 17, 2014
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FIGURE 23. OUTPUT SHORT CIRCUIT PROTECTION WITH
CONTINUOUS RETRY ENABLED (HICCUP MODE),
VIN = 12V, VOUT = 1.2V
FIGURE 24. OUTPUT SHORT CIRCUIT RECOVERY FROM CONTINUOUS
RETRY (HICCUP MODE). VIN = 12V, VOUT = 1.2V
FIGURE 25. SOFT-START WITH OUTPUT SEQUENCING AT VIN = 12V,
THREE ISL8272MEVAL1Z BOARDS ARE CONNECTED IN
DAISY CHAIN
FIGURE 26. SOFT-STOP WITH OUTPUT SEQUENCING AT VIN = 12V,
THREE ISL8272MEVAL1Z BOARDS ARE CONNECTED IN
DAISY CHAIN
FIGURE 27. DYNAMIC VOLTAGE SCALING WITH VOUT
CHANGE FROM 1.1V TO 1.3V, VIN = 12V,
VOUT_TRANSITION_RATE = 1mV/µs
FIGURE 28. PHASE SPREADING/INTERLEAVING, TWO
ISL8272MEVAL1Z BOARDS ARE CONNECTED IN DAISY
CHAIN, MODULE #1 RAIL POSITION: 0; MODULE #2
RAIL POSITION:4. VIN = 12V, VOUT_1 = 1.2V,
VOUT_2 = 3.3V, fSW = 421kHz
Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued)
PHASE1 (10V/DIV)
PHASE2 (10V/DIV)
VOUT (1V/DIV)
IIN (5A/DIV)
50ms/DIV
PHASE1 (10V/DIV)
PHASE2 (10V/DIV)
VOUT (1V/DIV)
IIN (5A/DIV)
50ms/DIV
5ms/DIV
ENABLE
VOUT_2 (1V/DIV)
VOUT_1 (1V/DIV)
VOUT_3 (1V/DIV)
MODULE #1: VOUT = 1V
MODULE #2: VOUT = 1.5V
MODULE #3: VOUT = 2.5V
5ms/DIV
ENABLE
VOUT_2 (1V/DIV)
VOUT_1 (1V/DIV)
VOUT_3 (1V/DIV) MODULE #1: VOUT = 1V
MODULE #2: VOUT = 1.5V
MODULE #3: VOUT = 2.5V
VOUT (200mV/DIV)
5ms/DIV
1µs/DIV
PHASE2 OF MODULE #2
PHASE2 OF MODULE #1
PHASE1 OF MODULE #1
PHASE1 OF MODULE #2
10V/DIV
10V/DIV
10V/DIV
10V/DIV

User Guide 003
14
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is
cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
UG003.0
September 17, 2014
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FIGURE 29. THERMAL IMAGE AT VIN = 12V, VOUT = 1V, IOUT = 50A,
fSW = 300kHz, TA= +25°C, NO AIRFLOW
FIGURE 30. THERMAL IMAGE AT VIN = 14V, VOUT = 5V, IOUT = 50A,
fSW = 533kHz, TA= +25°C, NO AIRFLOW
Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued)

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