Microchip Technology MCP73832T-5ACI/MC

Overview

MCP73832T-5ACI/MC from Microchip Technology is a miniature, 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-component-count charging solutions.

For engineers reviewing the MCP73832T-5ACI/MC datasheet, MCP73832T-5ACI/MC pinout, MCP73832T-5ACI/MC application, or MCP73832T-5ACI/MC equivalent, key selection criteria include its factory-set 4.50 V regulation voltage, thermal regulation behavior above ~105°C, open-drain STAT signaling, reverse discharge protection, and compatibility with Li-ion cells in space-constrained consumer electronics.

Technical Context

The MCP73832T-5ACI/MC implements a three-phase linear charging 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 4.50 V ±0.75%. It features integrated P-channel MOSFET pass transistor (R_DS(ON) = 350 mΩ max at 105°C), internal current sense, and automatic power-down when V_DD falls below UVLO thresholds (V_START = 3.45 V typ, V_STOP = 3.38 V typ).

Thermal regulation dynamically reduces charge current above die temperature ~105°C to prevent overheating, while thermal shutdown suspends charging at 150°C (10°C hysteresis). Battery detection uses 6 µA V_BAT sourcing; no-battery condition triggers when V_BAT ≥ V_REG + 100 mV, with impedance threshold >7 MΩ required for reliable insertion detection.

Key Specifications

Pinout & Package

Package: 8-lead 2 mm × 3 mm DFN with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 1 (MSL1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP73832T-2ACI/MC, the MCP73832T-5ACI/MC enables higher cell voltage compliance critical for next-gen Li-ion, while versus BQ24075RGTR it offers superior thermal performance and simpler BOM - making it optimal for compact, thermally constrained 4.5 V battery designs.

Availability

MCP73832T-5ACI/MC is available at Aetrix Electronics and suitable for USB chargers, wearable health monitors, Bluetooth audio accessories, and IoT sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MCP73832T-5ACI/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, interface, mixed-signal, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.

The MCP7383x family is designed specifically for space-constrained, cost-sensitive portable electronics requiring fully integrated, single-cell Li-ion/Li-polymer charging with minimal external components and robust thermal management.

FAQ

What is the factory-set regulation voltage for MCP73832T-5ACI/MC?

The MCP73832T-5ACI/MC is factory-configured for 4.50 V ±0.75% constant-voltage regulation, supporting higher-energy-density lithium-ion and lithium-polymer cells that require elevated termination voltages beyond the traditional 4.2 V standard. This value is laser-trimmed and non-adjustable in-circuit.

How does the STAT pin on MCP73832T-5ACI/MC behave during charging?

The STAT pin on MCP73832T-5ACI/MC is an open-drain output: it pulls low during preconditioning, constant-current, and constant-voltage charging phases, and goes into high-impedance state upon charge completion. This allows direct connection to microcontroller GPIO pins or LED anodes with external pull-up resistors.

Can MCP73832T-5ACI/MC operate without a battery connected?

Yes - MCP73832T-5ACI/MC detects absence of a battery using 6 µA sourcing from VBAT; if VBAT rises to ≥ VREG + 100 mV (≈4.6 V), it enters no-battery mode with <2 µA reverse discharge current and STAT in high-impedance state, preventing input-to-ground leakage.

What thermal performance can be expected from MCP73832T-5ACI/MC in its DFN package?

In the 2 mm × 3 mm DFN package with exposed thermal pad (EP) soldered to PCB copper, MCP73832T-5ACI/MC achieves θ_JA = 76°C/W under standard 4-layer board conditions. This enables sustained 500 mA charging at ambient ≤40°C before thermal regulation engages, significantly outperforming SOT-23 alternatives.

How is charge current programmed on MCP73832T-5ACI/MC?

Charge current is set by a single external resistor (R_PROG) from PROG to VSS, using I_REG = 1000 V / R_PROG (with R_PROG in kΩ and I_REG in mA). For 500 mA, R_PROG = 2.0 kΩ; for 100 mA, R_PROG = 10 kΩ. Preconditioning and termination currents scale ratiometrically with this value.