The SparkFun BabyBuck Regulator Breakout delivers a regulated 5V output from a 6–32V input in an ultra-compact 0.63" × 0.52" form factor. Based on the AP63357 synchronous buck converter from Diodes Inc., it provides up to 3.5A continuous output with high efficiency, integrated MOSFETs, and comprehensive protection circuitry.

With just four PTH pins (VIN, GND, VOUT, EN), the board is easy to integrate into any project. The enable pin supports up to 32V for direct battery-level control, and a copper pad on the back accommodates a heat sink for sustained high-current operation.

Key Features

• Regulated 5V Output – From 6V to 32V input range
• Up to 3.5A Output – 3A recommended without active cooling
• Ultra-Compact – 0.63" × 0.52" PCB with 0.1" spaced PTH pins
• High Efficiency – Up to 86% at 5 mA light load (PFM mode)
• 22 µA Quiescent Current – Excellent for battery-powered applications
• Enable Pin – High-voltage EN rated up to 32V with precision UVLO threshold
• Heat Sink Pad – 0.5" × 0.6" plated copper pad on the back
• 450 kHz Switching Frequency – With frequency spread spectrum for EMI reduction

Pin Configuration

• VIN – Power input (6V to 32V)
• GND – Common ground
• VOUT – Regulated 5V output
• EN – Enable (pull high to enable output)

Protection

• Undervoltage lockout (UVLO)
• Output undervoltage protection (UVP)
• Cycle-by-cycle peak current limit
• Thermal shutdown

Ideal For

• Battery-powered projects needing regulated 5V
• Automotive and solar panel voltage regulation
• Compact embedded systems
• Raspberry Pi and microcontroller power supplies

Resources

• Hookup Guide
• AP63357 Datasheet (PDF)
• Schematic (PDF)
• Eagle Files (ZIP)
• Board Dimensions (PDF)
• Manufacturer Product Page (Diodes Inc.)
• Hardware Design Files (GitHub)