MCP73871-1AAI/ML

Overview

The MCP73871-1AAI/ML is a standalone system load sharing and Li-Ion/Li-Polymer battery charge management controller manufactured by Microchip Technology. It integrates linear charging, power path management, and system load sharing in a single device. The IC supports a maximum input voltage of 6V and delivers up to 1.1A of programmable constant current for single-cell lithium batteries. Operating within a temperature range of -40°C to +85°C, it utilizes a 20-QFN (4x4mm) package with an exposed pad for thermal dissipation.

Feature Summary

• Integrated power path management enables seamless transition between USB source and battery supply without system interruption.
• Standalone operation eliminates the need for external microcontrollers or complex logic circuits.
• Programmable charge termination timer prevents overcharging conditions in case of sensor failure.
• Thermal regulation automatically reduces charge current to maintain safe operating temperatures.

Applications

• Portable IoT sensor nodes requiring continuous operation during charging
• Battery-powered handheld devices with USB connectivity
• Wireless communication modules with integrated power management
• Medical devices requiring reliable battery backup and charging

Procurement Notes

Verify component authenticity through authorized Microchip distributors. Confirm package marking matches the 20-QFN specification. Check datasheet revision for updated electrical characteristics. Ensure ESD handling procedures are followed during inspection. Validate supplier documentation against official Microchip part number records.

Selection Notes

Select this component when standalone load sharing is required without MCU intervention. Suitable for applications needing integrated thermal protection and programmable charge timing. Consider the 20-QFN package constraints for PCB layout. Verify input voltage compatibility with available power sources. Evaluate thermal performance requirements for the specific enclosure design.

Part Context

Part of the MCP73xx charge management controller family designed for space-limited applications. Shares functional similarities with MCP73833 and MCP73837 but adds advanced load sharing capabilities. Designed for single-cell lithium-ion and lithium-polymer battery systems. Offers higher integration compared to basic charge controllers.

Replacement Considerations

MCP73871-1CAI/ML and MCP73871-1CCI/ML are parameter-equivalent alternatives from Microchip Technology. These variants offer identical functionality with potential differences in packaging or temperature grades. Verify pinout compatibility before substitution. Confirm electrical specifications match application requirements.

FAQ

Does the MCP73871 require an external microcontroller for operation?

No, the MCP73871 operates as a standalone controller without requiring external processing units.

What happens when the USB source is disconnected?

The integrated power path management seamlessly switches the system load to the battery supply without interruption.

How is thermal protection implemented?

The device includes internal thermal regulation that automatically reduces charge current when junction temperature exceeds safe limits.