MCP73871 is a lithium battery charger chip from Microchip, supporting 4.10V, 4.20V, 4.35V and 4.40V multiple charging voltage, supporting USB port and AC power supply.
The MCP73871 is a stand‑alone system load‑sharing and Li‑Ion/Li‑Polymer battery charge management controller. It integrates system load sharing, voltage‑proportional current control, ideal‑diode power‑path management, reverse‑discharge protection, and selectable input sources (USB port or AC‑DC wall adapter). The device provides programmable charge voltage options, safety timers, temperature monitoring, and status indicators for system integration.
The datasheet includes electrical characteristics, DC and AC performance parameters, typical application circuits, and package information. It specifies a supply voltage range of 4.0–6.0 V, up to 1.8 A total input current, selectable charge voltages of 4.10 V, 4.20 V, 4.35 V, or 4.40 V, and operation over –40 °C to +85 °C. The controller is offered in a 20‑lead QFN package (4 mm × 4 mm) and is intended for portable devices such as GPS units, smartphones, media players, and medical equipment.
| Supply Input Voltage (Vin) | 4.0–6.0 V |
|---|---|
| Maximum Total Input Current | 1.8 A |
| Charge Voltage Options | 4.10 V, 4.20 V, 4.35 V, 4.40 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Package Type | 20‑Lead QFN (4 mm × 4 mm) |
It can be powered from a USB port or an AC‑DC wall adapter.
The controller offers four selectable charge voltages: 4.10 V, 4.20 V, 4.35 V, or 4.40 V.
The MCP73871 can handle up to 1.8 A total input current.
It operates from –40 °C to +85 °C.