This is a tiny DC-DC step-down converter module that accepts 4.5-28V as input voltage and outputs 0.8-20V. The output is configurable using a set screw.

For details, please refer to the MP1584 datasheet: https://www.monolithicpower.com/pub/media/document/MP1584_r1.0.pdf

Module size: 22x17x4mm.