Microchip Technology MCP73832-2DCI/MC

Overview

MCP73832-2DCI/MC from Microchip Technology is a miniature linear lithium-ion/polymer battery charge management controller in an 8-lead 2 mm × 3 mm DFN package with exposed thermal pad. It delivers ±0.75% voltage regulation at 4.20 V, supports programmable charge current from 15 mA to 500 mA via external resistor, features open-drain STAT output, and operates across –40°C to +85°C for USB-powered portable devices.

For engineers reviewing the MCP73832-2DCI/MC datasheet, MCP73832-2DCI/MC pinout, MCP73832-2DCI/MC application, or MCP73832-2DCI/MC equivalent, key selection criteria include its fixed 4.20 V regulation accuracy, thermal regulation behavior, open-drain STAT signaling, DFN package thermal performance (θ_JA = 76°C/W), and compatibility with single-cell Li-ion systems requiring USB-compliant power input.

Technical Context

The MCP73832-2DCI/MC implements a constant-current/constant-voltage (CC/CV) charging algorithm with factory-set 4.20 V regulation, selectable preconditioning (10%/20%/40% or disable), and end-of-charge termination thresholds (5%/7.5%/10%/20% of I_REG). Its internal P-channel MOSFET pass transistor provides reverse discharge protection and integrates current sense with 350 mΩ typical R_DS(ON) at 105°C.

Undervoltage lockout (UVLO) activates below 3.3 V (start) and releases above 3.5 V (stop) with 70 mV hysteresis; automatic power-down engages when V_DD falls within 20–50 mV of V_BAT. Thermal regulation begins before junction temperature reaches 150°C shutdown threshold, dynamically reducing charge current to maintain reliability under high ambient or power-dissipation conditions.

Key Specifications

Pinout & Package

Package: 8-lead 2 mm × 3 mm DFN with exposed thermal pad (EP), EP internally connected to VSS and must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP73831-2DCI/MC, the MCP73832-2DCI/MC's open-drain STAT simplifies LED and microcontroller interfacing without pull-up resistors, while versus BQ24075RGTR it offers finer charge termination control (5%/7.5%/10%/20%) and broader preconditioning flexibility-critical for battery health in cost-sensitive portable designs.

Availability

MCP73832-2DCI/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, long-term lifecycle support, and consistent parametric performance.

Supply support for MCP73832-2DCI/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 components, and battery management solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP73831/2 product line was designed specifically for space-constrained, cost-sensitive single-cell Li-ion/Li-polymer charging applications-emphasizing minimal external components, USB compliance, and robust thermal behavior in DFN and SOT-23 packages.

FAQ

What is the exact voltage regulation accuracy and nominal value for MCP73832-2DCI/MC?

The MCP73832-2DCI/MC is factory-configured for 4.20 V constant-voltage regulation with a tolerance of ±0.75%, meaning the actual regulated output falls between 4.168 V and 4.232 V at +25°C and specified operating conditions. This accuracy is guaranteed across the full –40°C to +85°C ambient temperature range and ensures safe, reliable full-charge termination for standard Li-ion cells without risk of overvoltage stress.

How does the STAT pin on MCP73832-2DCI/MC behave during the charge cycle?

The STAT pin on MCP73832-2DCI/MC is an open-drain output: it actively pulls low during all active charge phases (preconditioning, constant-current, and constant-voltage modes) and enters high-impedance (floating) state upon charge completion. Unlike the tri-state STAT on MCP73831 variants, this open-drain behavior eliminates the need for a pull-up resistor when driving an LED cathode or interfacing with open-collector logic, simplifying PCB layout and reducing component count in the MCP73832-2DCI/MC design.

What package type and thermal characteristics does MCP73832-2DCI/MC use?

MCP73832-2DCI/MC uses an 8-lead 2 mm × 3 mm DFN package with an exposed thermal pad (EP) internally connected to VSS. Its thermal resistance is θ_JA = 76°C/W on a 4-layer JEDEC-standard board under natural convection-significantly lower than the SOT-23-5 variant (230°C/W). The EP must be soldered to a PCB ground plane with multiple thermal vias to achieve rated performance and enable sustained 500 mA charging without premature thermal regulation.

Can MCP73832-2DCI/MC be used without a microcontroller in standalone applications?

Yes, MCP73832-2DCI/MC is fully functional in standalone mode: it autonomously executes the complete CC/CV charge algorithm-including preconditioning, fast charge, constant-voltage regulation, termination, and automatic recharge-using only external components (PROG resistor, input/output capacitors). No firmware, host processor, or communication interface is required. Its open-drain STAT output provides visual or basic system-level status indication without MCU involvement, making it ideal for simple, low-cost portable chargers.

What is the role of the PROG pin on MCP73832-2DCI/MC beyond setting charge current?

Beyond setting fast charge current (via resistor to VSS), the PROG pin on MCP73832-2DCI/MC serves as a hardware enable/disable control: floating PROG disables the device entirely, reducing quiescent current to ≤25 µA and blocking all charge activity-including reverse discharge-making it a low-power shutdown input. This dual function allows designers to implement manual charge enable switches, battery-presence detection circuits, or system-level power sequencing without additional logic components.