Adafruit AP3429A Buck Converter Breakout

Adafruit AP3429A Buck Converter Breakout is designed to supply power to 3.3V voltage circuits from a range of battery and power options. This converter provides up to 1.2A load current across the 3.4V to 5.5V input voltage range. The AP3429A is pin-compatible with an LM1117-3.3V TO-220 chip that can be swapped for better performance. This converter operates at 1MHz fixed-frequency and features hiccup mode for short circuit protection.


  • Internal soft-start
  • Hiccup mode for short circuit protection
  • Thermal shutdown
  • No latch off over-voltage protection
  • 1.2A output current
  • <1μA shutdown current
  • 100% duty cycle operation
  • 1MHz switching frequency
  • 15.2mm x 10.0mm x 2.9mm product dimension


Published: 2020-11-23 | Updated: 2022-09-21