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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, V
OUT
adjustable from 0.6V to 5V
• Programmable V
OUT
, margining, input and output UVP/OVP,
I
OUT
limit, OTP/UTP, soft-start/stop, sequencing, and
external synchronization
• Monitor: V
IN
, V
OUT
, I
OUT
, 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: <10mV
P-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
September 17, 2014
UG003.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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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.
