Digital DC/DC PMBus 25/33 Amp Modules


  • Complete digital switch mode power supply
    • Wide VIN range: 4.5V to 14V
    • Programmable VOUT range: 0.6V to 5V
  • PMBus 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
    • Fast transient response
    • Compensation-free
  • ±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


ISL8270M/71M Digital Power Modules


The ISL8270M/71M are 25A and 33A step-down DC/DC power supply modules 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 25/33A 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.

The ISL8270M/71M devices use ChargeMode™ control architecture, which responds to a transient load within a single switching cycle with a compensation free design. The ISL8270M/71M come 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, fault limits, current sharing, and external voltage tracking 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 ISL8270M/71M family is supported by Intersil's PowerNavigator™ software, a graphical user interface (GUI) that can be used to configure modules to a desired solution.

The ISL8270M/71M devices are 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 ISL8270M/71M ICs are RoHS compliant by exemption.


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

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Control Type Digital Digital
Current Sharing No No
Digital Yes Yes
Input Voltage Max (V) 17 17
Input Voltage Min (V) 4.5 4.5
Output Current Max (A) 25 33
Output Voltage Max (V) 5.5 5.5
Output Voltage Min (V) 0.54 0.54
Peak Efficiency (%) 96 96
Power-On Reset Yes Yes
Quiescent Current 40 mA 40 mA
Switching Frequency Max 1.067 MHz 1.067 MHz
Switching Frequency Min .296 MHz .296 MHz
Switching Frequency Range (MHz) 0.296 to 1.067 0.296 to 1.067
SYNCH Capability Yes Yes

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Title Size Last Updated
PDF - Intersil ISL8270M Digital DC/DC PMBus 25A Module 1,216 kB Mar 2014
PDF - Intersil ISL8271M Digital DC/DC PMBus 33A Module 1,278 kB Mar 2014
Evaluation Boards
Title Size Last Updated
PDF - Intersil ISL8270MEVAL1Z Evaluation Board User Guide 476 kB Mar 2014
PDF - Intersil ISL8271MEVAL1Z Evaluation Board User Guide 450 kB Mar 2014
Title Size Last Updated
File PowerNavigator™ Software    

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Part Number Package Type Weight (g) Pins Peak Temp (°C) RoHS Status
ISL8270M pkgType40 Ld MODULE 3.25127 40 245 RoHS Exempt
ISL8271M pkgType40 Ld MODULE 3.25127 40 245 RoHS Exempt
ISL8270MEVAL1Z         Ic Rohs
ISL8271MEVAL1Z         Ic Rohs

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The ISL8270MEVAL1Z and ISL8271MEVAL1Z evaluation boards provide all circuitry required to evaluate the features of the ISL8270M and ISL8271M. A majority of the features of the ISL8270M/71M, such as compensation-free ChargeMode™ control, soft-start delay and ramp times, supply sequencing and voltage margining are available on these evaluation boards. For sequencing evaluation, the boards can be connected to any Intersil digital module evaluation board that supports the Digital-DC™ (DDC) bus.

ISL8270MEVAL1Z Digital Power Module Evaluation Board ISL8271MEVAL1Z Digital Power Module Evaluation Board




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