LM3671 3.3V Buck Converter Breakout - 3.3V Output 600mA Max

This 3.3V buck converter breakout delivers up to 600mA from a 3.5–5.5V input (Li-Ion or USB) at 90–95% efficiency. It’s pin-compatible with LM1117-3.3V TO-220, includes an enable pin, and comes assembled with header for breadboarding.

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Sort out your power supply headaches with this Adafruit 3.3V Buck Converter Breakout, designed to efficiently power low-voltage circuits from a single Li-Ion cell or USB power. The onboard converter can supply up to 600mA load current across an input range of 3.5V to 5.5V, making it a great fit for portable builds and battery-powered projects.

It’s designed to be pin-compatible with the LM1117-3.3V TO-220, so you can swap it in as a drop-in upgrade for much better performance — with 90–95% efficiency. There’s also an EN (Enable) pin, which you can pull low to shut the output off completely.

The converter runs at a fixed 2MHz switching frequency in PWM mode, and it also supports PFM mode to help extend battery life by reducing current draw during light loads or standby operation.

Supplied as a fully assembled and tested breakout board, with header included so you can plug it straight into a breadboard.

Specifications

• Weight: 0.9g
• Dimensions: 16mm x 10mm x 3mm

Resources

• Datasheet
• EagleCAD files on GitHub
• Fritzing

Package Contents

• 1x LM3671 3.3V Buck Converter Breakout - 3.3V Output 600mA Max
• 1x 6-pin header