Microchip Technology MCP73832T-4ADI/MC

Overview

MCP73832T-4ADI/MC from Microchip Technology is a fully integrated linear lithium-ion/polymer battery charge management controller in an 8-lead 2 mm × 3 mm DFN package with exposed thermal pad. It delivers precise 4.50 V ±0.75% constant-voltage regulation, programmable fast-charge current up to 500 mA (via external PROG resistor), and open-drain STAT output for host microcontroller interfacing - designed for USB-powered portable devices requiring compact, low-BOM charging solutions.

For engineers reviewing the MCP73832T-4ADI/MC datasheet, MCP73832T-4ADI/MC pinout, MCP73832T-4ADI/MC application, or MCP73832T-4ADI/MC equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for space-constrained Li-ion charging designs.

Technical Context

The MCP73832T-4ADI/MC implements a three-phase linear charge algorithm: preconditioning (trickle charge at 10%/20%/40% of I_REG or disabled), constant-current fast charge (programmable 15–500 mA), and constant-voltage regulation at factory-set 4.50 V. It integrates a P-channel MOSFET pass transistor with 350 mΩ typical R_DS(ON), reverse discharge protection, and automatic thermal regulation that reduces charge current above 105°C to prevent die overheating.

Its UVLO circuit enforces 3.45 V start threshold with 70 mV hysteresis and disables charging when V_DD falls within +50 mV of V_BAT. Battery detection uses a 6 µA V_BAT current source; no-battery condition triggers when V_BAT ≥ V_REG + 100 mV. The open-drain STAT output signals charge status (low during active charge, high-impedance at completion) and supports direct MCU GPIO monitoring without pull-up.

Key Specifications

Pinout & Package

Package: 8-lead 2 mm × 3 mm DFN with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 1 (MSL1). EP is electrically connected to VSS and must be soldered to a PCB copper pour with thermal vias for reliable operation at >300 mA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP73832T-2ADI/MC, the MCP73832T-4ADI/MC enables higher energy density via 4.50 V charging, while BQ24075RGTR offers greater current headroom and power-path control at the cost of increased complexity and non-interchangeable layout.

Availability

MCP73832T-4ADI/MC is available at Aetrix Electronics and suitable for USB-powered portable devices, wearable health monitors, smart home sensors, and industrial handheld scanners requiring stable component supply and long-term production continuity.

Supply support for MCP73832T-4ADI/MC 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, FPGA, and mixed-signal semiconductors, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP7383x family was engineered specifically for cost-sensitive, space-constrained Li-ion/Li-polymer charging in portable electronics - emphasizing minimal external components, thermal resilience, and USB compliance without sacrificing precision or safety.

FAQ

What is the exact regulated output voltage of the MCP73832T-4ADI/MC?

The MCP73832T-4ADI/MC provides a factory-set constant-voltage regulation of 4.50 V with a tolerance of ±0.75% over −40°C to +85°C ambient temperature. This value is laser-trimmed during production and does not require external resistive feedback, ensuring consistent full-charge termination for high-voltage Li-polymer cells.

How is the fast charge current programmed on the MCP73832T-4ADI/MC?

The fast charge current for the MCP73832T-4ADI/MC is set by connecting a single external resistor (R_PROG) between the PROG pin and VSS. Using the formula I_REG = 1000 / R_PROG (with R_PROG in kΩ and I_REG in mA), a 2.0 kΩ resistor yields ~500 mA, while a 10 kΩ resistor yields ~100 mA. R_PROG must be between 2 kΩ and 67 kΩ for valid operation.

What is the function of the STAT pin on the MCP73832T-4ADI/MC?

The STAT pin on the MCP73832T-4ADI/MC is an open-drain output used to indicate charge status: it pulls low during preconditioning, constant-current, and constant-voltage phases, and goes into high-impedance state upon charge completion. This allows direct connection to an MCU GPIO (with external pull-up) or LED driver without additional logic.

Does the MCP73832T-4ADI/MC support automatic recharge?

Yes, the MCP73832T-4ADI/MC supports automatic recharge with a factory-set threshold of 94.0% of V_REG (i.e., ~4.23 V for the 4.50 V variant). When battery voltage drops below this level in Charge Complete mode, the device automatically restarts the full CC/CV charge cycle - critical for maintaining runtime in intermittently used portable devices.

What thermal management features does the MCP73832T-4ADI/MC include?

The MCP73832T-4ADI/MC incorporates two thermal protections: (1) thermal regulation that progressively reduces charge current above 105°C junction temperature to maintain safe operation, and (2) thermal shutdown at 150°C with 10°C hysteresis. Its 2 mm × 3 mm DFN package achieves 76°C/W θ_JA on a 4-layer board, enabling sustained 450 mA charging under typical conditions.