MCP73871T-2CAI/ML

Overview

The MCP73871T-2CAI/ML is a fully integrated linear charge management controller designed for single-cell lithium-ion and lithium-polymer batteries. It features system load sharing, allowing simultaneous power delivery to the system load and battery charging from AC-DC wall adapters or USB ports. The device supports selectable input power sources and includes preset high-accuracy charge voltage options of 4.10V, 4.20V, 4.35V, or 4.40V with ±0.5% regulation tolerance. It operates within a supply voltage range of 3.75V to 6V, offers a maximum charge current capability up to 1.8A total input current control, and utilizes a 20-QFN (4x4) package.

Feature Summary

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

Applications

• Portable consumer electronics requiring USB or AC-DC wall adapter charging
• Systems needing autonomous power source selection between input and battery
• Applications demanding precise voltage regulation for lithium-ion/polymer cells
• Devices operating under strict USB current draw limits

Procurement Notes

Verify the specific suffix '2CAI' corresponds to the desired charge voltage option (typically 4.20V or similar variant within the preset range) against the official Microchip datasheet. Confirm the 'ML' package designation matches the required 20-QFN footprint and thermal characteristics. Ensure compatibility with the intended PCB layout for the bare pad thermal connection. Cross-reference the full part number with authorized distributors to confirm availability and authenticity.

Selection Notes

Select this component when a compact solution for single-cell Li-Ion/Polymer charging with integrated load sharing is required. It is suitable for designs prioritizing efficiency through ideal diode operation and precise voltage regulation. Consider the 20-QFN package constraints and thermal requirements. Verify that the application's peak current demands do not exceed the 1.8A total input current limit. Ensure the design can accommodate the necessary external resistors for current programming if variable charge rates are needed beyond standard configurations.

Part Context

The MCP73871 series belongs to Microchip Technology's portfolio of battery management ICs, specifically targeting portable applications. This family integrates charge management and system load sharing in a small form factor. The MCP73871T-2CAI/ML represents a specific variant within this line, distinguished by its package type and internal voltage setting configuration, offering a complete linear solution for managing power flow between multiple sources and a single-cell battery.

Replacement Considerations

MCP73871-2CAI/ML