MCP73871-2CAI/ML

Overview

The MCP73871-2CAI/ML is a fully integrated linear charge management controller designed for single-cell lithium-ion and lithium-polymer batteries. It supports autonomous power source selection between USB ports and AC-DC wall adapters, enabling simultaneous system load sharing and battery charging. The device features an integrated pass transistor, reverse discharge protection, and thermal regulation. It offers selectable input sources and preset high-accuracy charge voltage options, including the 4.20V configuration indicated by the suffix. The solution requires minimal external components, making it suitable for space-constrained portable applications.

Feature Summary

• Integrated system load sharing allows simultaneous powering of the host system and charging of the Li-Ion/Li-Po battery
• Autonomous power source selection between USB port and AC-DC wall adapter inputs
• Includes integrated pass transistors, current sense, and reverse discharge protection
• Provides thermal regulation to manage heat dissipation during charging operations

Applications

• Portable consumer electronics requiring seamless power path management
• Space-constrained IoT sensor nodes with battery backup
• USB-powered devices with auxiliary battery charging capabilities
• Wearable technology utilizing single-cell lithium batteries

Procurement Notes

Verify the specific package variant and temperature grade corresponding to the -2CAI/ML suffix against the official Microchip datasheet. Confirm that the 4.20V preset voltage aligns with the target battery chemistry requirements. Ensure compatibility with the intended USB or AC-DC input specifications before finalizing procurement orders.

Selection Notes

Select this component when a compact, single-chip solution is required for managing both system power distribution and battery charging. It is appropriate for designs needing automatic switching between USB and wall adapter inputs without external control logic. Consider the integrated pass transistor feature to reduce bill of materials count compared to discrete solutions.

Part Context

This part belongs to the MCP73871 family of charge management controllers from Microchip Technology. The family is characterized by its ability to handle system load sharing and battery charging in a single IC. Variants within the series typically differ by preset charge voltage thresholds and package configurations to suit various portable application constraints.

Replacement Considerations

MCP73871-1AAI/ML

FAQ

What is the primary function of the MCP73871-2CAI/ML regarding power sources?

It autonomously selects power between a USB port and an AC-DC wall adapter while simultaneously powering the system load and charging the battery.

Does the MCP73871-2CAI/ML require external pass transistors?

No, the device includes integrated pass transistors, eliminating the need for external switching components.