Microchip Technology MCP73863-I/SL

Overview

MCP73863-I/SL from Microchip Technology is a fully integrated linear lithium-ion/lithium-polymer battery charge management controller for single-cell applications, featuring 4.1V/4.2V selectable voltage regulation (±0.5% accuracy), programmable fast-charge current up to 1.2A, preconditioning for deeply depleted cells, automatic end-of-charge detection, and thermal regulation. It operates from 4.5V to 12V input and supports continuous cell temperature monitoring via external thermistor.

For engineers reviewing the MCP73863-I/SL datasheet, MCP73863-I/SL pinout, MCP73863-I/SL application, or MCP73863-I/SL equivalent, this device delivers precise CV/CC control with integrated pass transistor, reverse-blocking protection, dual status outputs (STAT1/STAT2), safety timers, and QFN/SOIC package options - critical for space-constrained portable electronics requiring reliable, low-component-count charging solutions.

Technical Context

The MCP73863-I/SL implements a three-phase linear charging algorithm: preconditioning (trickle-charge at ~10% of IREG when VBAT < VPTH), constant-current fast charge (regulated by PROG resistor), and constant-voltage regulation (set via VSET pin logic). It integrates UVLO (4.25–4.65V start), thermal shutdown (155°C), and die-temperature-dependent current scaling to prevent overheating.

Its analog architecture includes a precision 1.2V internal reference, bias generator for thermistor interface (THREF = 2.55V typ.), dual comparators for temperature window detection (VT1 = 1.25V, VT2 = 0.62V), and open-drain STAT1/STAT2 outputs with 8mA sink capability - enabling direct LED drive without external drivers.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, body size 10.3 mm × 7.5 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP73863-I/ML and BQ24075RGTR, the MCP73863-I/SL provides native SOIC packaging for easier prototyping and repair, guaranteed preconditioning functionality, and unified thermistor bias/reference architecture - making it optimal for cost-sensitive, thermally moderate, and production-ready portable designs.

Availability

MCP73863-I/SL is available at Aetrix Electronics and suitable for smartphone battery charging, handheld medical instrument power systems, digital camera cradle chargers, and industrial PDA applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MCP73863-I/SL 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 components, and battery management ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The MCP7386X family was designed specifically for cost-sensitive, space-limited portable electronics requiring fully integrated, single-chip Li-ion/Li-Po charging - eliminating external pass transistors, current-sense resistors, and discrete safety logic.

FAQ

What is the function of the VSET pin on the MCP73863-I/SL?

The VSET pin selects the regulated battery voltage: connecting VSET to VSS configures the MCP73863-I/SL for 4.1V output, while connecting it to VDD selects 4.2V. This ±0.5% accurate setting accommodates different Li-ion anode chemistries and ensures optimal cell longevity and capacity retention in the MCP73863-I/SL application.

How does the MCP73863-I/SL handle deeply depleted batteries?

The MCP73863-I/SL automatically enters preconditioning mode when VBAT falls below 2.80V, applying a reduced current (~10% of fast-charge current) to safely restore voltage before initiating full-rate charging. This prevents lithium plating and thermal instability, a core safety feature built into the MCP73863-I/SL architecture.

What is the difference between STAT1 and STAT2 outputs on the MCP73863-I/SL?

STAT1 is the charge status output that turns OFF upon charge completion (MCP73863-specific behavior), while STAT2 is the fault status output that activates (pulls low) during overtemperature, timer expiration, or UVLO failure. Both are open-drain, 8mA-sink capable outputs supporting direct LED drive or microcontroller interfacing in the MCP73863-I/SL design.

Can the MCP73863-I/SL be used with dual-cell (8.4V) battery packs?

No - the MCP73863-I/SL is specifically designed for single-cell Li-ion/Li-Po applications with 4.1V/4.2V regulation. Dual-cell support (8.2V/8.4V) is provided by the MCP73862/4 variants. Using MCP73863-I/SL with an 8.4V pack would result in undercharging and reduced capacity; always match the variant to the battery configuration in MCP73863-I/SL deployments.

What thermal management features does the MCP73863-I/SL include?

The MCP73863-I/SL incorporates die-temperature-dependent charge current scaling (thermal regulation) and hard thermal shutdown at 155°C with 10°C hysteresis. During thermal regulation, the safety timers slow down to prevent premature timeout - ensuring reliable operation under sustained load or poor heatsinking, a key reliability feature of the MCP73863-I/SL.