Microchip Technology MCP73863-I/ML

Overview

MCP73863-I/ML from Microchip Technology is a fully integrated linear lithium-ion/polymer battery charge management controller for single-cell applications, featuring 4.1V/4.2V selectable voltage regulation, ±0.5% voltage accuracy, programmable 100–1200 mA fast-charge current via PROG pin, thermal regulation, and automatic preconditioning for deeply depleted cells. It operates from 4.5V to 12V input and supports cradle charging in portable electronics.

For engineers reviewing the MCP73863-I/ML datasheet, MCP73863-I/ML pinout, MCP73863-I/ML application, or MCP73863-I/ML equivalent, this device delivers precise CV/CC control with integrated pass transistor, reverse-blocking protection, dual status outputs (STAT1 off-at-completion, STAT2 fault-indicating), and thermistor-based temperature monitoring - critical for safe, space-constrained Li-ion charging designs.

Technical Context

The MCP73863-I/ML implements a three-phase linear charge algorithm: preconditioning (trickle-charge at ~10% of IREG when VBAT < 2.7–2.9V), constant-current fast charge (regulated by external PROG resistor), and constant-voltage regulation (4.1V or 4.2V set by VSET logic level). It integrates UVLO (4.25–4.65V start), thermal shutdown (155°C), and safety timers (precondition: 45–75 min; fast-charge: 1.1–1.9 hr; termination: 2.2–3.8 hr) all scaled by 0.1 µF TIMER capacitor.

Its analog architecture includes internal current-sense amplifier, precision 1.2V reference, bias generator for THREF (2.55V typ.), dual temperature comparators (VT1 = 1.25V, VT2 = 0.62V), and open-drain STAT1/STAT2 drivers (8 mA sink, 400 mV VOL @ 1 mA). The device uses an internal P-channel MOSFET pass element and supports reverse leakage current as low as 0.23 µA.

Key Specifications

Pinout & Package

Package: 16-pin, 4 mm × 4 mm QFN with exposed thermal pad (EP) internally connected to VSS. Requires soldering EP to PCB ground plane for thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP73861-I/ML, the MCP73863-I/ML provides deterministic end-of-charge signaling via STAT1 deactivation - simplifying host-side state detection. Versus BQ24075RGTR, it offers superior thermal safety and voltage configurability at the cost of higher external component count.

Availability

MCP73863-I/ML is available at Aetrix Electronics and suitable for smartphone charging circuits, portable medical monitors, digital camera battery packs, Bluetooth headset cradles, and handheld instrumentation requiring stable component supply and long-term industrial availability.

Supply support for MCP73863-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, and interface ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The MCP7386X family was designed specifically for cost-sensitive, space-constrained Li-ion/Li-polymer charging in portable consumer and industrial devices - emphasizing integration, safety, and minimal external component count.

FAQ

What is the key functional difference between MCP73863-I/ML and MCP73861-I/ML?

The MCP73863-I/ML and MCP73861-I/ML share identical pinout, regulation accuracy, and safety features, but differ in STAT1 behavior at end-of-charge: MCP73863-I/ML drives STAT1 LOW then turns it OFF, while MCP73861-I/ML flashes STAT1. This makes MCP73863-I/ML preferable for host MCU detection of charge completion via static logic level rather than timing-based edge detection. Both use the same MCP73863-I/ML package and PROG programming method.

How is the 4.1V vs. 4.2V regulation voltage selected on MCP73863-I/ML?

The MCP73863-I/ML selects its output regulation voltage via the VSET pin: connecting VSET to VSS configures 4.1V output, while connecting VSET to VDD configures 4.2V output. This selection is active during power-up and remains latched; no dynamic switching is supported. The choice depends on battery anode chemistry - 4.1V for coke anodes, 4.2V for graphite - and directly impacts cycle life and capacity. MCP73863-I/ML does not support intermediate voltages.

Can MCP73863-I/ML be used for dual-cell (8.2V/8.4V) battery charging?

No, MCP73863-I/ML is strictly a single-cell Li-ion/Li-polymer charger and cannot regulate 8.2V or 8.4V. Those voltages are exclusive to the MCP73862/4 variants, which feature different internal reference scaling and higher input voltage requirements (8.7–12V). Attempting to use MCP73863-I/ML for dual-cell applications will result in under-regulation and potential cell damage. Always verify part number suffix and datasheet section 1.0 before selecting for multi-cell configurations.

What is the purpose of the THREF and THERM pins on MCP73863-I/ML?

THREF provides a stable 2.55V reference to bias an external NTC or PTC thermistor, while THERM reads the resulting divided voltage to monitor battery temperature. The MCP73863-I/ML compares THERM against two thresholds (VT1 ≈ 1.25V, VT2 ≈ 0.62V) to detect out-of-range temperatures and suspend charging. This dual-threshold window comparator enables safe charging across -10°C to +45°C ambient, and is mandatory for UL/IEC 62368-1 compliance in consumer devices using MCP73863-I/ML.

Does MCP73863-I/ML require external MOSFETs or diodes for basic operation?

No, MCP73863-I/ML integrates a P-channel MOSFET pass transistor, current-sense circuitry, reverse-blocking protection, and voltage references - enabling full linear charging functionality with only five external components: PROG resistor, TIMER capacitor, input/output bypass capacitors, and thermistor network. No external MOSFET, Schottky diode, or op-amp is needed for standard single-cell 4.1V/4.2V charging. This integration reduces footprint, BOM cost, and design validation effort for MCP73863-I/ML implementations.