Microchip Technology MCP73863T-I/ML

Overview

MCP73863T-I/ML from Microchip Technology is a fully integrated linear lithium-ion/polymer battery charge management controller for single-cell applications, featuring 4.2V voltage regulation (VSET = VDD), programmable 1.2A fast-charge current via PROG pin, ±0.5% voltage accuracy, thermal regulation, and automatic preconditioning of deeply depleted cells. It operates from 4.5V to 12V input and delivers precise constant-current/constant-voltage charging in portable electronics with minimal external components.

For engineers reviewing the MCP73863T-I/ML datasheet, MCP73863T-I/ML pinout, MCP73863T-I/ML application, or MCP73863T-I/ML equivalent, this device supports critical design tasks including Li-ion safety timer configuration, thermistor-based temperature monitoring, STAT1/STAT2 LED status decoding, and thermal shutdown validation at 155°C - all within its 4×4 mm QFN-16 package.

Technical Context

The MCP73863T-I/ML implements a three-stage linear charging algorithm: preconditioning (trickle-charge at ~10% of IREG when VBAT < 2.85V), constant-current fast charge (up to 1.2A), and constant-voltage regulation (4.2V ±0.5%). It integrates an internal P-channel MOSFET pass transistor, reverse-blocking protection, and UVLO with 4.5V start/4.4V stop thresholds.

Thermal regulation dynamically reduces charge current above ~100°C to prevent die overheating, while thermal shutdown suspends charging at 155°C with 10°C hysteresis. The device uses dual VSS pins (VSS1/VSS2/VSS3) for low-impedance ground routing and supports optional continuous cell temperature monitoring via THREF (2.55V reference) and THERM inputs with 1.25V/0.62V trip thresholds.

Key Specifications

Pinout & Package

Package: 16-pin 4 mm × 4 mm QFN with exposed thermal pad (EP) internally connected to VSS.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Li-ion charge management applications.

Compared with MCP73863T-I/ML, MCP73861T-I/ML offers identical regulation and safety features but differs in STAT1 behavior, while BQ24075RGTR trades voltage configurability and discrete thermistor interface for higher current and integrated power-path management - making each suitable for distinct subsystem priorities.

Availability

MCP73863T-I/ML is available at Aetrix Electronics and suitable for smartphone battery charging, digital camera power management, portable medical monitors, and Bluetooth headset cradle chargers requiring stable component supply across production lifecycles.

Supply support for MCP73863T-I/ML includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and battery management ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The MCP7386X family was designed specifically for cost-sensitive, space-constrained portable electronics requiring fully autonomous, high-accuracy linear Li-ion charging - emphasizing integration, safety compliance, and minimal external component count.

FAQ

What is the exact voltage regulation setting for MCP73863T-I/ML?

The MCP73863T-I/ML is configured for 4.2V regulation by default, as indicated by the "3" in its part number and confirmed by Microchip's documentation: when VSET is tied to VDD, the device regulates to 4.2V ±0.5% (typ. 4.2V, min 4.179V, max 4.221V). This matches graphite-anode Li-ion cells and is factory-trimmed for precision.

How does MCP73863T-I/ML handle deeply depleted batteries?

The MCP73863T-I/ML automatically initiates preconditioning when VBAT falls below 2.85V (VPTH), applying a reduced current (~10% of IREG) to safely recover deeply discharged cells. This trickle-charge mode continues until VBAT exceeds VPTH or the 60-minute precondition timer expires - preventing thermal runaway during initial reactivation.

What is the function of the STAT1 pin on MCP73863T-I/ML?

On the MCP73863T-I/ML, the STAT1 pin is a current-limited open-drain output that turns OFF upon successful charge termination - distinguishing it from the MCP73861/2 variants which flash STAT1. This behavior simplifies LED status indication in systems where steady OFF = charged, eliminating need for timing circuitry.

Can MCP73863T-I/ML be used with dual-cell Li-ion batteries?

No. The MCP73863T-I/ML is strictly a single-cell Li-ion/Li-polymer charger, supporting only 4.1V or 4.2V regulation. Dual-cell applications require the MCP73862/4 series (8.2V/8.4V), which differ in UVLO thresholds, VSET interpretation, and internal reference scaling - making them incompatible replacements for MCP73863T-I/ML.

What thermal protection mechanisms does MCP73863T-I/ML implement?

The MCP73863T-I/ML implements two-tier thermal protection: first, thermal regulation begins around 100°C, progressively reducing charge current to maintain safe die temperature; second, thermal shutdown activates at 155°C (with 10°C hysteresis), halting all charging until die cools - both functions are fully internal and require no external components.