MCP73871T-4CAI/ML

Overview

The MCP73871T-4CAI/ML is a fully integrated linear solution for system load sharing and Li-Ion/Li-Polymer battery charge management. It supports AC-DC wall adapter and USB port power sources with autonomous selection between input or battery. The device features a fixed 4.20V charge voltage, programmable constant current up to 1.1A, and maximum 1.8A total input current control. It operates within a supply voltage range of 3.75V to 6V and functions across an industrial temperature range of -40°C to +85°C. The component is housed in a 20-QFN (4x4 mm) package.

Feature Summary

• Integrated system load sharing and battery charge management allowing simultaneous system powering and battery charging
• Voltage proportional current control ensuring system load priority over battery charge current
• Low-loss power-path management with ideal diode operation for efficient power transfer
• Complete linear charge management controller with integrated pass transistors and reverse discharge protection

Applications

• Portable electronic devices requiring combined system power and battery charging
• USB-powered applications adhering to USB specification current limits
• AC-DC wall adapter powered systems with automatic source selection
• Li-Ion and Li-Polymer single-cell battery management solutions

Procurement Notes

Verify the specific suffix '4CAI' confirms the 4.20V preset output voltage option. Confirm the 'T' prefix indicates tape-and-reel packaging versus tube variants. Ensure the ML package designation matches the required 20-QFN footprint. Cross-reference the full part number against official Microchip databases to confirm active status and RoHS compliance before procurement.

Selection Notes

Select this component when a compact, fully integrated solution for load sharing and charging is required. It is suitable for designs needing automatic power source selection between USB and AC-DC adapters. The fixed 4.20V regulation fits standard Li-Ion cells. Consider the 1.1A charge current limit and 1.8A total system current capability against application demands.

Part Context

This part belongs to the MCP73871 family of battery chargers from Microchip Technology. It is designed for portable applications where space and external component count are critical constraints. The family offers various voltage presets and packaging options to accommodate different system requirements while maintaining high accuracy and thermal regulation capabilities.

Replacement Considerations

MCP73871-4CAI/ML

FAQ

What is the fixed charge voltage for the MCP73871T-4CAI/ML?

The MCP73871T-4CAI/ML has a fixed charge voltage of 4.20V.

Does the MCP73871 support automatic power source selection?

Yes, it autonomously selects power between the input source (AC-DC or USB) and the battery.

What is the maximum total input current allowed?

The device supports a maximum total input current of 1.8A for both system load and battery charging.