This is a kicad project/pcb design for a monolithic power systems MP5056. The purpose is to protect against shorts/overcurrent with exposed magnetic connectors like these ones (affiliate link).
I made a video about using this with a DeWalt battery here.
Thanks to NextPCB for sponsoring this project. Get your first PCB order at $0.1 via NextPCB.
Important: I am a hobbyist electronics engineer, please evaluate this design before using it.
Values chosen per the MP5056 datasheet:
| Component | Value | Notes |
|---|---|---|
| EN divider | 100 kΩ / 22 kΩ | Identical to FB, ~3.2 V at 18 V input |
| ISET | 30 kΩ | Sets current limit to ~4 A at 18 V input |
| AUTO | floating | |
| FLTB | floating | |
| PG | floating | |
| FB divider | 100 kΩ / 22 kΩ | ~3.2 V at 18 V input |
| SS (soft start) | 100 nF | |
| TIMER | 220 nF | |
| IMON | 10 kΩ to ground | Not used |