SparkFun BabyBuck Regulator Breakout - 5V (AP63357)

by Sparkfun

The SparkFun 5V BabyBuck 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 board 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. With only four PTH pins for connecting input and output power, everything fits on a mere 0.63in. x 0.52in. board layout.

Check out the SparkFun Buck Regulator Breakout - 5V (AP63357), for the larger, full-feature version of this board.

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.

Get started with the SparkFun AP63357 Buck Regulator Guide

Features

BabyBuck Board:

  • 0.63" x 0.52" PCB layout
  • Four 0.1" spaced PTH pins
    • VIN - Power In (6V to 32V)
    • GND - Common Ground
    • VOUT - Power Out (Regulated 5V)
    • EN - Enable (Pull high to enable the power output)
  • 0.5" x 0.6" 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

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