SparkFun BabyBuck Regulator Breakout – 5V (AP63357)

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.

The BabyBuck regulator is a minimalistic version of our buck regulator boards. 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.

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

Resources

• Schematic
• Eagle Files
• Board Dimensions
• Hookup Guide
• Datasheet (AP63357)
• Manufacturer’s Product Page (AP63357)
  • Technical Documentation
  • Diodes Technical Support Page
• GitHub Hardware Repo

Package Contents

• 1x SparkFun BabyBuck Regulator Breakout – 5V (AP63357)