ISL8271M Digital DC/DC PMBus 33A Module0 pages

Digital DC/DC PMBus 33A Module
ISL8271M

Features

The ISL8271M is a 33A step-down DC/DC power supply module
with integrated digital PWM controller, synchronous power
switches, an inductor and passives. Only bulk input and output
capacitors are needed to finish the design. The 33A of
continuous output current can be delivered without a need of
airflow or a heatsink. The thermally enhanced HDA module is
capable of dissipating heat directly into the PCB.

• Complete digital switch mode power supply
- Wide VIN range: 4.5V to 14V
- Programmable VOUT range: 0.6V to 5V

The ISL8271M uses ChargeMode™ control architecture, which
responds to a transient load within a single switching cycle.
The ISL8271M comes with a preprogrammed configuration for
operating in a pin strap mode; output voltage, switching
frequency, and device SMBus address can be programmed
with external resistors. More configuration such as soft-start
and fault limits can be easily programmed or changed via
PMBus compliant serial bus interface. PMBus can be used to
monitor voltages, current, temperatures and fault status. The
ISL8271M is supported by PowerNavigator™ software, a
graphical user interface (GUI) that can be used to configure
modules to a desired solution.
The ISL8271M is available in a 40-pin compact 17mmx19mm
HDA module with very low profile height 3.55mm, suitable for
automated assembly by standard surface mount equipment.
The ISL8271M is RoHS compliant by exemption.

• PMBus compliant I2C communication interface
- Programmable VOUT, margining, UV/OV, IOUT limit,
soft-start/stop, sequencing, and external synchronization
- Monitor: VIN, VOUT, IOUT, temperature, duty cycle,
switching frequency and faults
• ChargeMode control architecture
• ±1.0% VOUT accuracy over line, load and temperature
• Power-Good indicator
• Over-temperature protection
• Internal non-volatile memory and fault logging
• Patented thermally enhanced HDA package

Applications
• Server, telecom, storage, and datacom
• Industrial/ATE, and networking equipment
• General purpose power for ASIC, FPGA, DSP and memory

Related Literature
• AN1925, “ISL8271MEVAL1Z Evaluation Board User Guide”

VIN

VIN
CIN

VOUT

VDD

VSEN+
VSEN-

2.2

17m

m
19

COUT

m

m

SCL

VDRVOUT

SDA

10µ

SALRT

SGND

PMBUS
INTERFACE

ISL8271M
VDRVIN

1µ

VOUT

3.55mm

PGND

NOTE:
1. Only bulk input and output capacitors are required to finish the design.
FIGURE 1. A COMPLETE DIGITAL SWITCH MODE POWER SUPPLY

March 13, 2014
FN8636.0

1

FIGURE 2. A SMALL PACKAGE FOR HIGH POWER DENSITY

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), ChargeMode, PowerNavigator 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.