The ISL6721 is a low power, single-ended Pulse Width Modulating (PWM) current mode controller designed for a wide range of DC/DC conversion applications including Boost, Flyback and isolated output configurations. Peak current mode control effectively handles power transients and provides inherent overcurrent protection. Other features include a low power mode where the supply current drops to less than 200μA during overvoltage and overcurrent shutdown faults. This advanced BiCMOS design features low operating current, adjustable operating frequency up to 1MHz, adjustable soft-start, and a bidirectional SYNC signal that allows the oscillator to be locked to an external clock for noise sensitive applications.


  • 1A MOSFET gate driver
  • 100μA start-up current
  • Fast transient response with peak current mode control
  • Adjustable switching frequency up to 1MHz
  • Bidirectional synchronization
  • Low power disable mode
  • Delayed restart from OV and OC shutdown faults
  • Adjustable slope compensation
  • Adjustable soft-start
  • Adjustable overcurrent shutdown threshold
  • Adjustable UV and OV monitors
  • Leading edge blanking
  • Integrated thermal shutdown
  • 1% tolerance voltage reference
  • Pb-free available (RoHS compliant)


  • Telecom and Datacom Power
  • Wireless Base Station Power
  • File Server Power
  • Industrial Power Systems
  • Isolated Buck and Flyback Regulators
  • Boost Regulators

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active SOICN Tube 960
Active SOICN Reel 2500
Active TSSOP Tube 960
Active TSSOP Reel 2500

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL6721 Datasheet Datasheet PDF 1.11 MB
User Guides & Manuals
ISLACDC750WEVKIT1Z Evaluation Kit User Guide Manual PDF 2.25 MB
ISL6721EVAL3Z User Guide Manual PDF 572 KB
Application Notes & White Papers
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
PCN21006 - Alternate assembly facility of the listed Renesas TSSOP packaged products Product Change Notice PDF 131 KB
PCN16026 - Wafer Fabrication Site Change for Listed ISL6721ABZ* Intersil Products Product Change Notice PDF 218 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
PCN13060 - Test Site Change for the Listed Intersil Products Product Change Notice PDF 223 KB
PCN13026 - Alternate Manufacturing Site for Assembly of the Listed Intersil SOIC Packaged Products - Amkor Technology, Philippines (ATP) Product Change Notice PDF 77 KB
PCN12094 - Alternate Manufacturing Site for Assembly of the Listed Intersil Packaged Products - Amkor Technology, Philippines (ATP) Product Change Notice PDF 98 KB
PCN12068 - SOIC w/ Copper Bond Wire @ ASECL as Alternate Assembly Site Product Change Notice PDF 108 KB
ISL6721 iSim:PE Model Schematic SXSCH 397 KB
PLC14051E - Rescind ISL6721 package variant from PLC14051A - return to released status Product Life Cycle Notice PDF 200 KB
PLC14051A - Product Discontinuance / Obsolescence Notification Product Life Cycle Notice PDF 124 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
ISL6721EVAL3Z Resonant Reset Forward Converters for Low Power Applications Evaluation Board Evaluation Renesas
ISLACDC750WEVKIT1Z Boost PFC and Asymmetrical Full-Bridge ZVS Converter Evaluation Kit Evaluation Renesas