4.2 Li-Po Battery Charger

A 4.2V, Li-Po battery connected to the 2-pin, 2 mm pitch right-angle male battery header can be charged using Battery Management IC MCP73871-2CC (U12) from the USB power supply at 100 mA fast charge current.

The battery management circuit automatically handles selection between the USB power supply and battery supply. The current is shared between charging the battery (if connected) and the target application section. For more details on the MCP73871 Li-ion/Li-Po battery charger, refer to the Stand-Alone System Load Sharing and Li-Ion/Li-Polymer Battery Charge Management Controller Data Sheet (DS20002090).