MCP73871-1CAI/ML

Overview

The MCP73871-1CAI/ML is a single-cell lithium-ion/polymer battery charger IC from Microchip Technology, housed in a 20-QFN (4x4 mm) package. It integrates a power path management controller and a linear charge regulator. The device supports AC-DC adapter or USB input sources, automatically selecting the optimal supply for system load and battery charging. Key electrical parameters include a maximum programmable charging current of 1.1A, a fixed 6V maximum supply voltage, and a 4.1V battery pack voltage rating. It operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates power path management for seamless switching between input source and battery power without system interruption.
• Supports intelligent load sharing, allowing simultaneous charging and system operation when an external power source is connected.
• Features automatic input source selection between AC-DC adapters and USB ports to optimize power delivery.
• Includes thermal regulation capabilities that reduce charging current based on die temperature to ensure safe operation.

Applications

• Portable IoT sensor nodes requiring continuous operation during charging
• Space-constrained consumer electronics with USB or wall adapter power options
• Battery-powered devices needing uninterrupted system power during recharge cycles
• Wearable technology utilizing lithium-ion or lithium-polymer cells

Procurement Notes

Verify the specific suffix '1CAI' corresponds to the required terminal voltage configuration and package variant before ordering. Confirm compatibility with the 20-QFN footprint and soldering profile. Ensure the selected component meets the intended operating temperature range and regulatory compliance standards for the target market.

Selection Notes

Select this component for applications requiring integrated power path management alongside battery charging. It is suitable for designs where system uptime during charging is critical. Consider the 1.1A current limit and 4.1V output setting against the specific battery chemistry and load requirements. Evaluate the thermal performance in the final enclosure design due to the linear regulation architecture.

Part Context

This part belongs to the MCP73871 family of battery chargers designed for portable applications. It distinguishes itself by combining charge management with power path control in a single chip. This integration reduces component count and board space compared to solutions using separate charger and PMIC devices. The family targets modern mobile and IoT devices demanding efficient power management.

Replacement Considerations

Direct substitutes include MCP73871-1AAI/ML and MCP73871-1CCI/ML. These variants share the same core functionality but may differ in terminal voltage settings or specific package tolerances. Verify pinout compatibility and electrical specifications before swapping. Consult official datasheets for detailed parameter comparisons to ensure functional equivalence in the existing design.

FAQ

How does the MCP73871 handle system power when both a battery and an input source are present?

The device utilizes integrated power path management to prioritize the input source for system load while simultaneously charging the battery. If the input source is removed, it seamlessly switches to battery power without interrupting system operation.

What protection features are included in the MCP73871-1CAI/ML?

The IC includes over-temperature protection that reduces charging current if the die temperature exceeds safe limits. It also features standard lithium-ion charging protections such as charge termination monitoring and input undervoltage lockout.