MCHPMCP73831-2ACI/MC

Overview

The MCP73831-2ACI/MC is a single-cell linear charge-management controller for Lithium-Ion and Lithium-Polymer batteries. It provides a programmed constant-current charge phase and a 4.2 V regulated float/termination voltage. The charge current is set with an external resistor, and the device includes basic fault protection and an input supply limit up to 6 V. It is a surface-mount device rated for operation from -40 to 85 C (TA).

Why Choose This Part

The MCP73831 family offers a very low component-count single-cell charge solution with an adjustable constant-current option using a single resistor. Its 4.2 V regulation and basic fault protection make it easy to integrate into small battery-powered designs without the complexity of power-path management. The device accepts up to 6 V input, allowing direct USB or similar supplies, and the surface-mount package keeps PCB area small and low-cost.

Applications

Getting Started

Read Microchip's MCP73831 datasheet and reference schematics for example charge circuits and resistor sizing to set charge current. Prototype on a small breakout or breadboard-friendly adapter so you can verify resistor values, charge current, and termination behavior with a bench power supply and an instrument to monitor battery voltage and temperature. Add the recommended input and battery decoupling components and a thermistor or battery monitoring if your application requires temperature-compensated charging.

MCP7383 Family

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