The ISL6420A advanced single synchronous buck pulse width modulation (PWM) controller simplifies the implementation of a complete control and protection scheme for a high-performance DC/DC buck converter. It is designed to drive N-channel MOSFETs in a synchronous rectified buck topology. The control, output adjustment, monitoring, and protection functions are integrated into a single package.

The ISL6420A provides simple, single feedback loop, voltage mode control with fast transient response. The output voltage of the converter can be precisely regulated to as low as 0.6V, with a maximum tolerance of ±1.0% over temperature and line voltage variations.

The ISL6420AEVALxZ evaluation boards have been optimized for a 12V input from a standard power supply but can accept a range from 4.5V to 5.5V or 5.5V to 28V as desired. Standoff terminals have been provided in order to connect the input source and the load.


  • Operates from:
    • 4.5V to 5.5V input
    • 5.5V to 28V input
  • 0.6V internal reference voltage
    • ±1.0% reference accuracy
  • Resistor-selectable switching frequency
    • 100kHz to 1.4MHz
  • Voltage margining and external reference tracking modes
  • Output can sink or source current
  • Lossless, programmable overcurrent protection
    • Uses upper MOSFET's rDS(ON)
  • Programmable soft-start
  • Drives N-channel MOSFETs
  • Simple single-loop control design
    • Voltage-mode PWM control
  • Fast transient response
    • High bandwidth error amplifier
    • Full 0% to 100% duty cycle
  • Extensive circuit protection functions
    • PGOOD, overvoltage, overcurrent, shutdown
  • Diode emulation during startup for pre-biased load applications
  • Pb-free (RoHS compliant)


  • Power supplies for microprocessors/ASICsEmbedded controllers
  • DSP and core processors
  • DDR SDRAM bus termination
  • Ethernet routers and switchers
  • High-power DC/DC regulators
  • Distributed DC/DC power architecture
  • Personal computer peripherals
  • Externally referenced buck converters

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL6420A Datasheet Datasheet PDF 1.14 MB
User Guides & Manuals
ISL6420AEVALxZ User Guide Manual PDF 2.23 MB
Application Notes & White Papers
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
ISL8117EVAL1Z Design Files Design File ZIP 933 KB
ISL8130EV1Z Design Files Design File ZIP 135 KB
ISL8117EVAL2Z Design Files Design File ZIP 655 KB
ISL8117DEMO2Z Design Files Design File ZIP 511 KB
ISL8117DEMO1Z Design Files Design File ZIP 724 KB
ISL8115EVAL2Z Design Files Design File ZIP 934 KB
ISL8115EVAL1Z Design Files Design File ZIP 967 KB
ISL8115DEMO1Z Design Files Design File ZIP 762 KB
ISL8104EVAL1Z Design Files Design File ZIP 209 KB
ISL78268EVAL1Z Design Files Design File ZIP 1.10 MB