MCP73871T-3CAI/ML

Overview

The MCP73871T-3CAI/ML is a standalone system load sharing and Li-Ion/Li-Polymer battery charge management controller by Microchip Technology. It supports AC-DC wall adapter and USB port power sources with autonomous selection. The device features integrated pass transistors, current sense, and reverse discharge protection. It offers selectable input sources and preset high-accuracy charge voltage options including 4.10V, 4.20V, 4.35V, or 4.40V with ±0.5% regulation tolerance. Operating in Constant Current/Constant Voltage mode with thermal regulation, it manages up to 1.8A total input current while ensuring system load priority via Voltage Proportional Current Control.

Feature Summary

• Integrated system load sharing and battery charge management for simultaneous system powering and charging
• Voltage Proportional Current Control ensures system load priority over battery charge current
• Low-loss power-path management with ideal diode operation
• Complete linear charge management controller with integrated pass transistors and reverse discharge protection

Applications

• Portable electronic devices requiring simultaneous operation and charging
• USB-powered applications adhering to current drawn limits
• AC-DC wall adapter powered systems with battery backup
• Autonomous power source selection between input and battery

Procurement Notes

Verify the specific suffix '3CAI' corresponds to the required 4.35V preset charge voltage option when ordering. Confirm the ML package variant matches the target PCB footprint requirements. Ensure compatibility with the intended input power source architecture, whether USB or AC-DC adapter, as the device supports both but requires proper external component configuration for optimal performance and compliance with USB specifications.

Selection Notes

Select this component for applications needing integrated load sharing without external diodes. The 4.35V preset option suits specific battery chemistries requiring higher termination voltages. Consider the 20-QFN package size for space-constrained designs. Verify that the maximum 1.8A total input current meets the system's peak power demands. Ensure thermal management strategies align with the device's thermal regulation capabilities during high-load scenarios.

Part Context

The MCP73871 series belongs to Microchip's portfolio of battery management ICs designed for portable electronics. This specific part integrates load sharing and charging functions, reducing bill-of-materials complexity. It targets applications where space efficiency and simplified design are critical. The family supports various lithium-ion and lithium-polymer battery types, offering flexibility in charge voltage settings to accommodate different cell specifications and safety requirements.

Replacement Considerations

MCP73871-3CAI/ML