Single Synchronous Buck Pulse Width Modulation (PWM) Controller Evaluation Board


The ISL6520EVAL1 evaluation board highlights the operation of the ISL6520A synchronous buck PWM controller in an embedded application.

The evaluation board is populated with the ISL6520A controller IC and is flexible enough to allow for reference designs with 5A, 10A and 15A output currents at a fixed output voltage of 3.3V. A simple resistor change allows the output to go as low as 0.8V to as high as the input voltage. This flexibility allows a power supply designer to easily modify an existing design to suit almost any relevant application. The ISL6520EVAL1 DC/DC converter demo boards are customized to provide up to 15A of current at a fixed output voltage.

Designed to drive N-channel MOSFETs in a synchronous buck topology, the ISL6520A integrates the control, output adjustment, monitoring, and protection functions into a single 8-Lead package. The ISL6520A provides simple, single feedback loop, voltage-mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over-temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency.

Key Features

  • Operates from +5V input
  • 0.8V to VIN output range
    • 0.8V internal reference
    • ±1.5% over line voltage and temperature
  • 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
  • Lossless, programmable overcurrent protection
    • Uses upper MOSFETs rDS(ON)
  • Small converter size
    • 300kHz fixed frequency oscillator
    • Internal soft-start
    • 8-Ld SOIC or 16-Ld 4mm x 4mm QFN
  • Pb-Free (RoHS Compliant)


  • Power supplies for microprocessors
    • PCs
    • Embedded controllers
  • Subsystem power supplies
    • PCI/AGP/GTL+ buses
    • ACPI power control
    • SSTL-2 and DDR SDRAM bus termination supply
  • Cable modems, set-top boxes and DSL modems
  • DSP and core communications processor supplies
  • Memory supplies
  • Personal computer peripherals
  • Industrial power supplies
  • 5V-input DC/DC regulators
  • Low-voltage distributed power supplies

ISL6520EVAL1 Evaluation Board Layout

Related Product


Tool Information

Tools Orderable Part Number (s) Production Status Manufacturer Suggested Single Tool Price
Description Distributor Stock Distributors Distributor Purchase Buy Direct
ISL6520EVAL1 Mass Production Renesas $82.50 1 0 Call -

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