SparkFun Buck Regulator Breakout - 5V (AP63357)

The SparkFun 5V Buck Regulator Breakout features the AP63357 from Diodes Inc., a 3.5A synchronous buck converter with a wide input voltage range of 3.8V to 32V. The fully integrated 74mΩ high-side power MOSFET/40mΩ low-side power MOSFET provides a high-efficiency step-down DC/DC conversion.

This full-size, 1in. x 1in. version of our buck regulator boards is configured to provide a regulated 5V output (from a 6 to 32V input voltage range) and features a high-voltage EN (enable) control pin that is rated up to 32V. On the back of the board, a small copper pad is available to dissipate excess heat with a heat sink.

As a full-size buck regulator breakout, additional options for connecting input and output power. There is a pre-assembled screw terminal for a non-permanent connection, the option to solder on a barrel jack for an external power supply, and five PTH pins to create a more permanent installation. Our full-size buck regulators also come with a red, power indication LED that light up when the power output is enabled and two mounting holes compatible with 4-40 hardware.

Check out our BabyBuck regulators and the SparkFun BabyBuck Regulator Breakout - 5V (AP63357), for the smaller minimalistic versions of our buck regulators.

Note: While the AP63357 is rated up to a 3.5A output, users should expect a 3A maximum with our boards due to thermal constraints. The boards can output 3.5A but would require a sufficient amount of active cooling.

Buck Board:

  • 1in. x 1in. PCB layout
  • Three power input/output options:
    • Pre-assembled 4-pin screw terminal
    • Five 0.1in. spaced PTH pins
    • Three plated slots for a DC barrel jack (input only)
  • Power connections:
    • VIN - Power In (6V to 32V)
    • GND - Common Ground
    • VOUT - Power Out (Regulated 5V)
    • EN - Enable (Pull high to enable the power output)
  • Red, power LED indicator
  • 0.5in. x 0.6in. Plated copper pad (for heat sinks)

AP63357:

  • VIN 3.8V to 32V
  • 3.5A Continuous Output Current
  • 0.8V ± 1% Reference Voltage
  • 22µA Low Quiescent Current (Pulse Frequency Modulation)
  • 450kHz Switching Frequency
  • Supports Pulse Frequency Modulation (PFM)
    • Up to 86% Efficiency at 5mA Light Load
  • Proprietary Gate Driver Design for Best EMI Reduction
  • Frequency Spread Spectrum (FSS) to Reduce EMI
  • Low-Dropout (LDO) Mode
  • Power Good Indicator with 5MΩ Internal Pull-up
  • Precision Enable Threshold to Adjust UVLO
  • Protection Circuitry
    • Undervoltage Lockout (UVLO)
    • Output Undervoltage Protection (UVP)
    • Cycle-by-Cycle Peak Current Limit
    • Thermal Shutdown

SparkFun Buck Regulator Breakout - 5V (AP63357) Product Help and Resources

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2 Programming

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Core Skill: Electrical Prototyping

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Comments

Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #1876101 / about 5 months ago / 1

    There should have been pads provided to short EN to Vin.

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