The ISL6228 IC is a dual channel synchronous-buck PWM controller featuring Intersil's Robust Ripple Regulator (R3) technology that delivers truly superior dynamic response to input voltage and output load transients. Integrated MOSFET drivers and bootstrap diodes result in fewer components and smaller implementation area. Intersil's R3 technology combines the best features of fixedfrequency and hysteretic PWMs while eliminating many of their shortcomings. R3 technology employs an innovative modulator that synthesizes an AC ripple voltage signal VR, analogous to the output inductor ripple current. The AC signal VR enters a window comparator where the lower threshold is the error amplifier output VCOMP, and the upper threshold is a programmable voltage reference VW, resulting in generation of the PWM signal. The voltage reference VW sets the steady-state PWM frequency. Both edges of the PWM can be modulated in response to input voltage transients and output load transients, much faster than conventional fixedfrequency PWM controllers. Unlike a conventional hysteretic converter, each channel of the ISL6228 has an error amplifier that provides ±1% voltage regulation at the FB pin. The ISL6228 has a 1. 5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL6228 operates in continuous-conduction-mode (CCM) in heavy load, and in diode-emulation-mode (DEM) in light load to improve light-load efficiency. In CCM, the controller always operates as a synchronous rectifier. In DEM, the low-side MOSFET is permitted to stay off, blocking negative current flow into the low-side MOSFET from the output inductor.


  • High performance R3 technology
  • Fast transient response
  • ±1% regulation accuracy: -10°C to +100°C
  • Individual power stage input rail for each channel
  • Wide input voltage range: +3.3V to +25V
  • Output voltage range: +0.6V to +5V
  • Diode emulation mode for increased light load efficiency
  • Programmable PWM frequency: 200kHz to 600kHz
  • Pre-biased output start-up capability
  • Integrated MOSFET drivers and bootstrap diode
  • Internal digital soft-start
  • Power good monitor
  • Fault protection
  • Undervoltage protection
  • Soft crowbar overvoltage protection
  • Inductor DCR overcurrent protection
  • Over-temperature protection
  • Fault identification by PGOOD pull-down resistance
  • Pb-free available (RoHS compliant)


  • General purpose switching buck regulators
  • PCI express graphical processing unit
  • Auxiliary power rail
  • VRM
  • Network adapter

Product Options

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

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL6228 Datasheet 简体中文 Datasheet PDF 874 KB
User Guides & Manuals
ISL8200MEVAL2PHZ User Guide Manual PDF 683 KB
ISL6228HIEVAL3Z User Guide Manual PDF 1.10 MB
ISL6228EVAL3Z User Guide Manual PDF 1.10 MB
ISL6228LOEVAL3Z User Guide Manual PDF 1.10 MB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
PCN14036 - Wafer fabrication Site Change for Listed Intersil Products - Palm Bay, Florida Product Change Notice PDF 294 KB
PCN12052 - Alternate Manufacturing Site for Assembly of the Listed Intersil QFN Packaged Products - Advanced Semiconductor Engineering - Chung-Li, Taiwan (ASECL) Product Change Notice PDF 90 KB
PCN10055 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - STATS ChipPAC Malaysia Product Change Notice PDF 248 KB
ISL6228 iSim:PE Model Schematic SXSCH 135 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
ISL6228EVAL3Z High-Performance Dual-Output Buck Controller Evaluation Board Evaluation Renesas
ISL6228HIEVAL3Z High-Performance Dual-Output Buck Controller Evaluation Board Evaluation Renesas
ISL6228LOEVAL3Z High-Performance Dual-Output Buck Controller Evaluation Board Evaluation Renesas