The ISL85033 is a dual standard buck regulator capable of 3A per channel continuous output current. With an input range of 4. 5V to 28V, it provides a high frequency power solution for a variety of point of load applications. The PWM controller in the ISL85033 drives an internal switching N-Channel power MOSFET and requires an external Schottky diode to generate the output voltage. The integrated power switch is optimized for excellent thermal performance up to 3A of output current. The PWM regulator switches at a default frequency of 500kHz and it can be user programmed or synchronized from 300kHz to 2MHz. The ISL85033 utilizes peak current mode control to provide flexibility in component selection and minimize solution size. The protection features include overcurrent, UVLO and thermal overload protection. The ISL85033 is available in a small 4mmx4mm Thin Quad Flat No-Lead (TQFN) Pb-free package.


  • Wide input voltage range from 4.5V to 28V
  • Adjustable output voltage with continuous output current up to 3A
  • Current mode control
  • Adjustable switching frequency from 300kHz to 2MHz
  • Independent power-good detection
  • Selectable in-phase or out-of-phase PWM operation
  • Independent, sequential, ratiometric or absolute tracking between outputs
  • Internal 2ms soft-start time
  • Overcurrent/short circuit protection, thermal overload protection, UVLO
  • Boot undervoltage detection
  • Pb-free (RoHS compliant)


  • General purpose point of load DC/DC power conversion
  • Set-top boxes
  • FPGA power and STB power
  • DVD and HDD drives
  • LCD panels, TV power
  • Cable modems

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TQFN Tube 75
Active TQFN Reel 6000

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL85033 Datasheet 日本語 Datasheet PDF 1.95 MB
User Guides & Manuals
ISL85033EVAL2Z (Short Form) User Guide Manual PDF 364 KB
ISL85033CRSHEVAL1Z User Guide Manual PDF 1.16 MB
ISL85033DUALEVAL1Z User Guide Manual PDF 1.12 MB
ISL85033-12VEVAL3Z User Guide Manual PDF 678 KB
Application Notes & White Papers
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
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 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
PCN12084 - Manufacturing Site Change for the Listed Intersil Products - Carsem (CAS) Ipoh Malaysia Product Change Notice PDF 135 KB
ISL85033CRSHEVAL1Z Design Files Design File ZIP 797 KB
ISL85033EVAL2Z Design Files Design File ZIP 271 KB
ISL85033 Dual iSim:PE Model Schematic SXSCH 322 KB
ISL85033 Current Share iSim:PE Model Schematic SXSCH 286 KB
Motor Solution Brochure 日本語 Brochure PDF 4.54 MB
PA12010 - Data Sheet Specification Change for Intersil Product ISL85033IRTZ* Product Advisory PDF 136 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
ISL85033-12VEVAL3Z Wide VIN Dual Standard Buck Regulator Evaluation Board In a Negative Output Voltage Configuration Evaluation Renesas
ISL85033DUALEVAL1Z Wide VIN Dual Standard Buck Regulator Evaluation Board Evaluation Renesas
ISL85033EVAL2Z Wide VIN Dual Standard Buck Regulator with 3A/3A Continuous Output Current Evaluation Board Evaluation Renesas