DATASHEET
ISL8271M
Digital DC/DC PMBus 33A Module
FN8636
Rev.4.00
Aug 17, 2017
The ISL8271M is a 33A step-down DC/DC power supply module
with an 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 the need
for airflow or a heatsink. The thermally enhanced HDA module
is capable of dissipating heat directly into the PCB.
Features
• Complete digital switch mode power supply
- Wide V range: 4.5V to 14V
IN
- Programmable V
range: 0.6V to 5V
OUT
2
• PMBus compliant I C communication interface
- Programmable V , margining, UV/OV, I
limit,
OUT OUT
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: the output voltage, switching
frequency, and the device SMBus address can be programmed
with external resistors. Other configuration options, such as
soft-start and fault limits can be programmed or changed
using the 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.
soft-start/stop, sequencing, and external synchronization
- Monitor: V , V , I , temperature, duty cycle,
IN OUT OUT
switching frequency, and faults
• ChargeMode control architecture
• ±1.0% V
OUT
accuracy over line, load, and temperature
• Power-good indicator
• Over-temperature protection
• Internal nonvolatile memory and fault logging
• Patented thermally enhanced HDA package
• Intuitive configuration using PowerNavigator
The ISL8271M is available in a 40 Ld compact 17mmx19mm
HDA module with very low profile height of 3.55mm, suitable
for automated assembly by standard surface mount
Applications
• Server, telecom, storage, and datacom
• Industrial/ATE and networking equipment
• General purpose power for ASIC, FPGA, DSP, and memory
equipment. The ISL8271M is RoHS compliant by exemption.
Related Literature
• For a full list of related documents, visit our website
- ISL8271M product page
VIN
V
OUT
V
IN
V
OUT
C
IN
V
SEN+
V
DD
C
OUT
V
SEN-
2.2
ISL8271M
V
DRVIN
SCL
SDA
3.55mm
V
DRVOUT
1µ
10µ
SALRT
SGND
PGND
NOTE:
1. Only bulk input and output capacitors are required to finish the design.
FIGURE 1. A COMPLETE DIGITAL SWITCH MODE POWER SUPPLY
FIGURE 2. A SMALL PACKAGE FOR HIGH POWER DENSITY
FN8636 Rev.4.00
Aug 17, 2017
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