The ISL8240M is a fully-encapsulated step-down switching power supply that can deliver up to 100W output power from a small 17mmx17mm PCB footprint. The two 20A outputs may be used independently or combined to deliver a single output of 40A. Designing a high-performance board-mounted power supply has never been simpler -- only a few external components are needed to create a very dense and reliable power solution. 1. 5% output voltage accuracy, differential remote voltage sensing and fast transient response create a very high-performance power system. Built-in output overvoltage, overcurrent and over-temperature protection enhance system reliability. The ISL8240M is available in a thermally-enhanced QFN package. Excellent efficiency and low thermal resistance permit full power operation without heat sinks or fans. In addition, the QFN package with external leads permits easy probing and visual solder inspection.


  • Fully-encapsulated dual step-down switching power supply
  • Up to 100W output from a 17mmx17mm PCB footprint
  • Dual 20A or single 40A output
  • Up to 94% conversion efficiency
  • 4.5V to 20V input voltage range
  • 0.6V to 2.5V output voltage range
  • 1.5% output voltage accuracy with differential remote sensing
  • Output overvoltage, overcurrent and over-temperature protection
  • QFN package with exposed leads permits easy probing and visual solder inspection


  • Computing, networking and telecom infrastructure
  • equipment
  • Industrial and medical equipment
  • General purpose point-of-load (POL) power

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active Module Tray 65
Active Module Reel 250

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL8240M Datasheet Datasheet PDF 1.86 MB
User Guides & Manuals
ISL8240MEVAL4Z User Guide Manual PDF 967 KB
ISL8240MEVAL3Z User Guide Manual PDF 684 KB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
Carrying the Heat Away from Power Module PCB Designs 简体中文 White Paper PDF 866 KB
How Green is Your Cloud? White Paper PDF 295 KB
The Benefits of Using an Integrated Power Module vs. a Discrete Regulator 简体中文 White Paper PDF 169 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
PCN15046 - Wafer Fabrication Site Change for Listed Intersil Products - Global Foundry P6 Process transfer to Palm Bay - Phase II Product Change Notice PDF 398 KB
ISL8240MEVAL4Z Design Files Design File ZIP 1.21 MB
ISL8240MEVAL3Z Design Files Design File ZIP 1.69 MB
ISL8240M Single Output iSim:PE Model Schematic SXSCH 250 KB
ISL8240M Dual Output iSim:PE Model Schematic SXSCH 261 KB
Power Module Board Level Reliability Report Other PDF 187 KB
TB488: PCB Land Pattern Design and Surface Mount Guidelines for POL Modules Other PDF 980 KB

Software & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs. Renesas

Boards & Kits

Part Number Title Type Company
ISL8240MEVAL3Z Dual 20A/Single 40A Step-Down Power Module Evaluation Board Evaluation Renesas
ISL8240MEVAL4Z Dual 20A/Single 40A Step-Down Power Module Evaluation Board Evaluation Renesas