The ISL85413 is a 300mA synchronous buck regulator with an input range of 3. 5V to 40V. It provides an easy to use, high efficiency low BOM count solution for a variety of applications. The ISL85413 integrates both high-side and low-side NMOS FETs and features a PFM mode for improved efficiency at light loads. This feature can be disabled if forced PWM mode is desired. The part switches at a default frequency of 700kHz. By integrating both NMOS devices and providing internal configuration, minimal external components are required, reducing BOM count and complexity of design. With the wide VIN range and reduced BOM, the part provides an easy to implement design solution for a variety of applications while giving superior performance. It will provide a very robust design for high voltage industrial applications as well as an efficient solution for battery powered applications. The part is available in a small Pb-free 3mmx3mm TDFN plastic package with an operation junction temperature range of -40°C to +125°C.


  • Wide input voltage range of 3.5V to 40V
  • Synchronous operation for high efficiency
  • No compensation required
  • Integrated high-side and low-side NMOS devices
  • Selectable PFM or forced PWM mode at light loads
  • Internal switching frequency 700kHz
  • Continuous output current up to 300mA
  • Internal soft-start
  • Minimal external components required
  • Power-good and enable functions available Applications


  • Industrial control
  • Medical devices
  • Portable instrumentation
  • Distributed power supplies
  • Cloud infrastructure

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TDFN Tube 100
Active TDFN Reel 6000
Active TDFN Reel 250

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL85413 Datasheet Datasheet PDF 1.36 MB
User Guides & Manuals
ISL85413DEMO3Z User Guide Manual PDF 909 KB
ISL85413DEMO1Z, ISL85412DEMO1Z User Guide Manual PDF 318 KB
ISL85413EVAL1Z, ISL85412EVAL1Z User Guide Manual PDF 800 KB
Application Notes & White Papers
Doing More with Buck Regulator ICs White Paper PDF 1.07 MB
How to Reconfigure a Buck Converter for Multiple Outputs White Paper PDF 468 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1965: Effectively Using the Intersil Small Form Factor Power Management Evaluation Boards Application Note PDF 2.35 MB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN9210: A New Pspice Subcircuit For The Power MOSFET Featuring Global Temperature Options Application Note PDF 650 KB
AN9209: A Spice-2 Subcircuit Representation For Power MOSFETs Using Empirical Methods Application Note PDF 387 KB
AN7244: Understanding Power MOSFETs Application Note PDF 349 KB
ISL85413EVAL1Z Design Files Design File ZIP 2.27 MB
ISL85413DEMO3Z Design Files Design File ZIP 2.12 MB
ISL85413DEMO1Z Design Files Design File ZIP 883 KB

Boards & Kits

Part Number Title Type Company
ISL85412DEMO1Z 300mA, 150mA Synchronous Buck Regulator Demonstration Boards Demonstration Renesas
ISL85412EVAL1Z Wide VIN 150mA/300mA Synchronous Buck Regulators Evaluation Board Evaluation Renesas
ISL85413DEMO1Z 300mA, 150mA Synchronous Buck Regulator Demonstration Boards Demonstration Renesas
ISL85413DEMO3Z 300mA Synchronous Buck Regulator Demonstration Board Demonstration Renesas
ISL85413EVAL1Z Wide VIN 150mA/300mA Synchronous Buck Regulators Evaluation Board Evaluation Renesas