MCHPMCP73871 USB/AC Battery Charger with Power Management
Overview
The MCP73871T-4CAI/ML is a single-cell lithium-ion/lithium-polymer battery charger with integrated power-path management from Microchip. It is designed for portable products that can run from USB or an AC adapter while charging the battery and powering the system at the same time. The part supports programmable charge current and includes timer-based charge control plus over-temperature fault protection.
Why Choose This Part
The main benefit of this part is its combination of a programmable single-cell charger and power-path management in one device, which simplifies portable power design. That integration can reduce external component count and make source switchover behavior easier to implement. For battery-powered products, the timer and over-temperature protection features add practical charging safety controls.
Applications
Key Specifications
Getting Started
This is a power-management IC, so it is typically used on a custom PCB rather than with an off-the-shelf development board. Start by following the Microchip datasheet reference schematics closely, especially for input source selection, battery connection, charge-current programming, and any status or enable pins. For firmware-free designs, hardware setup and resistor selection are the main tasks; for system-level designs, verify how the load shares power between USB/adapter input and the battery during charge and discharge transitions.
MCP7387 Family
Comparing specs that differ across variants. The current part is highlighted.
| Part Number | Battery Pack Voltage | Stock |
|---|---|---|
| MCP73871T-4CAI/ML (this part) | 4.4V | 3,090 |
| MCP73871-2CCI/ML | 4.2V | 4,988 |
| MCP73871EV | — | 9 |
| MCP73871-2AAI/ML | 4.2V | 1,967 |
| MCP73871T-1CCI/ML | 4.1V | 3,530 |
| MCP73871-2CAI/ML | 4.2V | 979 |
| MCP73871T-2CAI/ML (Microchip) | 4.2V | — |
