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AP3429A 3.3V Buck Converter Breakout - 3.3V Output 1.2A Max &endash; Default Title

This little buck converter based on the AP3429A is super handy, taking up to 5.5V input and providing a 3.3V output with up to 1.2A current. Read more...

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This little buck converter based on the AP3429A is super handy, taking up to 5.5V input and providing a 3.3V output with up to 1.2A current.

It's great for supplying power to popular 3.3V voltage circuits from a range of battery or power options.  This chip provides up to 1.2 Amp load current across the entire input voltage range of 3.4 to 5.5V. It's not a huge range but does cover LiPoly batteries, 3 alkalines, and USB power.

Great for your portable project, Adafruit made this "pin compatible" with the LM1117-3.3V TO-220 chip so you can swap it in for better performance (90-95% efficiency!) There's also an ENable pin, tie it low to shut down the output completely.

The Adafruit AP3429A Breakout runs at 1-MHz fixed-frequency. Even though the chip itself supports up to 2A, the inductor they used is small and so the breakout can only provide about 1.2 Amps.

If you need a wider input range, check out the 3.3V output MPM3610 breakout with up to 20V input!

Comes with a fully assembled and tested breakout board.  Also includes header to plug it into a breadboard.

TECHNICAL DETAILS

  • Output Current: Up to 1.2A
  • Shutdown Current: <1μA
  • 100% Duty Cycle Operation
  • 1MHz Switching Frequency
  • Internal Soft Start
  • Short Circuit Protection: Hiccup Mode Protection
  • Over Voltage Protection: AP3429A: No Latch Off Protection
  • Thermal Shutdown

Product Dimensions: 15.2mm x 10.0mm x 2.9mm / 0.6" x 0.4" x 0.1"