This is a low power DC-DC Buck converter to supply current for microcontrollers and sensor with 5V and 3,3V, you can select the voltage with two SMD jumper on the bottom of the PCB so at the end you are able to power up low-voltage devices, up to 500 mA of current, with a 25x10mm board.

The main IC of this design is the Texas Instrument Buck Controller TPS54331 here you have the datasheet, it’s a switch integrated controller and I used it because is part of the Basic Component Library of JLCPCB manufacture and is compatible with the power supply design tool of TI, something that speed up the designing process. This PCB for it self is not part of any final device. It is just a development board to make prototypes but some of my final projects has a copy paste of this changing only inductors or output capacitor values.

In this repo you have the project designed on Kicad 6.0 .

Dario Gonzalez.