LiPo Battery Charger Circuit

Li-Po Battery or Lithium-ion Polymer battery is a Rechargeable battery which uses a polymer electrolyte instead of a liquid electrode. This battery can be termed as LiPo, Li-Poly, LIP, Lithium-Poly etc., This Lipo battery comes in different shape size and different voltage, current rating for an example.

1Cell lipo battery = 3.7V to 4.2V

3Cell lipo battery = 11.1V to 12.6V

6Cell lipo battery = 22.2V to 25V




By connecting more cell Lipo we can get higher voltage battery pack. LiPo battery can be dangerous when overcharged, undercharged or discharged at a faster rate than the safe rate. Hence we need right LiPo Battery charger circuit.

Circuit Diagram

Components Required (BOM)

1C1, C210µFC_0805_2012Metric2
2R3, R41KΩR_0805_2012Metric2
3R15KΩR_0805_2012Metric1
4R22KΩR_0805_2012Metric1
5D1, D2LEDLED_0805_2012Metric2
6U1MCP73831SOT-23-51
7J1Conn_BatteryJST_EH_B2B-EH-A_1x02_P2.50mm_Vertical1
8J2Conn_PwrPinHeader_1x04_P2.00mm_Vertical1
9P1USB_C_Plug_USB2.0USB_C_Receptacle_GCT_USB40851

Construction & Working

Li-Po Battery charger circuit designed by using IC MCP73831. This IC MCP73831 from microchip is a miniature single cell, fully integrated li-ion, li-polymer battery charge management controller. This IC can be programmed to give 100 mA to 1000 mA charging current. This IC comes in 8-lead DFN and 5 lead SOT-23 packages.

This Lipo battery charger circuit designed to charge 4.2V battery and gives 500mA charging current. Input for this circuit comes from USB C Receptacle GCT USB 4085. Hence we can easily connect and charge Lipo battery.

This circuit provides Pin header and JST battery connector, hence we can connect Lipo battery in these two way. In this circuit D1 LED indicates the charging status and D2 LED indicates the full charge condition or charge done.

Printed Circuit Board

LiPo Battery Charger Circuit PCB Gerber Files.

Interactive Board Viewer

     




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