MCP73871-4CAI/ML

Overview

The MCP73871-4CAI/ML is a fully integrated linear charge management controller for single-cell lithium-ion and lithium-polymer batteries. It features an internal pass transistor, reverse discharge protection, and system load sharing capabilities. The device supports autonomous power source selection between USB ports and AC-DC wall adapters. It offers selectable constant voltage regulation options of 4.10V, 4.20V, 4.35V, or 4.40V with ±0.5% accuracy. Maximum input current is controlled at 1.8A, and it includes thermal regulation to limit charging current based on die temperature.

Feature Summary

• Integrated system load sharing allows simultaneous powering of the system load and battery charging via voltage proportional current control.
• Autonomous power source selection operates between USB ports and AC-DC wall adapters without manual intervention.
• Includes integrated pass transistors, current sensing, and reverse discharge protection within a compact package.

Applications

• Portable consumer electronics requiring space-constrained battery management
• USB-powered devices needing automatic power path switching
• Applications utilizing AC-DC wall adapters for simultaneous operation and charging

Procurement Notes

Verify the specific suffix '4CAI' corresponds to the desired 4.35V output voltage option and the ML package variant. Confirm that the selected component matches the required regulatory compliance standards for the target market. Ensure compatibility with the intended NTC thermistor configuration if thermal monitoring is utilized in the design.

Selection Notes

Select this component when a single-chip solution for both load sharing and charging is required. It is suitable for designs where input current must be limited to 1.8A total. Choose this part over discrete solutions to reduce external component count and board space. Ensure the application does not exceed the maximum operating temperature range specified for the device.

Part Context

This component belongs to the MCP73871 family of charge management controllers from Microchip Technology. The family provides integrated linear charging solutions for portable applications. The specific model differs by output voltage setting and package type, offering flexibility for various battery chemistries and form factors.

Replacement Considerations

• MCP73871-4AAI/ML
• MCP73871-4CCI/ML

FAQ

What is the function of Voltage Proportional Current Control (VPCC)?

VPCC ensures that the system load has priority over the Li-Ion battery charge current, maintaining stable operation during high-load conditions.

How does the device handle thermal conditions?

The MCP73871-4CAI/ML includes thermal regulation that limits the charging current if the die temperature exceeds a threshold, pausing charging until temperatures normalize.