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Lipo Charger-Booster
A small form factor 5 V 1 A boost converter and LiPo-Battery charger with integrated safety features. Originally intended for use in a Game Boy.
Front view showing the charging and protection circuitry Side view showing the boost converter section
Components
- TP4056 1 A standalone linear Li-Ion battery charger with thermal protection in SOP-8 package
- MT3608 High efficiency 1.2 MHz 2 A boost converter
Schematics & Design Files
The schematic above is available on GitHub along with the full set of design and production files.
Mistakes & Learnings
In the first version I connected the switch S1 to the EN pin of the boost converter instead of inline with the battery output. This meant that the output of the board could not be switched off completely. With the switch in the off position there would still be the battery voltage on the output. This was fixed in the second version.