Adafruit TLV62569 3.3V Buck Converter Breakout 1.2A engineering development tool

Adafruit TLV62569 3.3V Buck Converter Breakout

The Adafruit TLV62569 breakout is a step-down switching regulator that delivers a fixed 3.3V output at up to 1.2A continuous current from an input range of 3.4V to 5.5V. It achieves 90-95% efficiency and runs at a 1.5-MHz fixed frequency. The board measures 15.2mm x 10.0mm x 2.9mm and includes thermal shutdown protection. It suits engineers and hobbyists prototyping portable 3.3V circuits powered by LiPoly batteries, triple alkaline cells or USB sources.

Pin-compatible LM1117-3.3V TO-220 replacement checks

Verify that your existing design uses the LM1117-3.3V in a TO-220 footprint, as this breakout is pin compatible with that specific linear regulator package. Confirm your input voltage stays within the 3.4V to 5.5V window; the converter will not regulate below 3.4V. Ensure the load does not exceed 1.2A continuous current, although short spikes up to 2A are possible. The enable pin must be driven high for normal operation or pulled low to shut down the output completely.

Thermals noise and power draw in normal use

The TLV62569 chip integrates thermal shutdown to protect the device during overload or high ambient temperature conditions. High 90-95% efficiency means minimal heat is generated compared to linear regulators, reducing the need for external heatsinking in typical 1.2A applications. Switching at 1.5-MHz allows the use of a small onboard inductor, keeping the profile low at 2.9mm height. No fan or active cooling is required for normal operation within the rated current and voltage limits.