Microchip Technology MCP73827-4.2VUATR

Overview

MCP73827-4.2VUATR from Microchip Technology is a linear single-cell lithium-ion battery charge management controller in an 8-pin MSOP package, featuring ±1% voltage regulation accuracy at 4.2 V, programmable fast-charge current via external sense resistor, automatic preconditioning for deeply depleted cells, and open-drain MODE output for status indication - deployed in compact portable devices requiring space-constrained, cost-sensitive charging solutions.

For engineers reviewing the MCP73827-4.2VUATR datasheet, MCP73827-4.2VUATR pinout, MCP73827-4.2VUATR application, or MCP73827-4.2VUATR equivalent, key selection considerations include its fixed 4.2 V regulation voltage, 4.5–5.5 V input range, thermal-aware linear architecture with external P-MOSFET drive, IMON current monitor output, and -20°C to +85°C operating temperature specification.

Technical Context

The MCP73827-4.2VUATR implements a three-phase charge algorithm: preconditioning (foldback current at ~43% of peak), controlled-current fast charge (regulated by VSNS voltage drop across external R_SENSE), and constant-voltage termination (4.2 V ±1%). Its internal voltage reference (1.2 V) feeds precision amplifiers for both voltage and current control loops, with dedicated foldback amplifier and gate-drive output (VDRV) for external P-channel MOSFETs.

Charge status is signaled via open-drain MODE pin (low during preconditioning/fast charge, high-impedance in CV mode), while IMON provides 26 V/V amplified replica of (VIN − VSNS) for microcontroller-based current profiling. Shutdown logic (SHDN) enables/disables operation with <0.5 µA quiescent current in sleep mode, and automatic power-down activates when VIN falls below VBAT.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (UA), 3.0 mm × 4.9 mm footprint, 0.65 mm pitch, 0.85 mm nominal molded thickness - optimized for space-constrained portable PCB layouts with thermal vias under exposed pad (if present).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP73831T-420I/OT, MCP73827-4.2VUATR delivers superior system visibility via IMON and MODE signals; compared with BQ24075RGTR, it avoids I²C dependency and external component overhead while maintaining identical 4.2 V regulation accuracy and industrial temperature support.

Availability

MCP73827-4.2VUATR is available at Aetrix Electronics and suitable for personal data assistants, cellular telephones, and hand-held instruments requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant tape-and-reel packaging.

Supply support for MCP73827-4.2VUATR 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and battery management ICs, with emphasis on reliability, longevity, and industrial-grade specifications.

The MCP73827 product line delivers cost-optimized, stand-alone linear charge controllers for space-constrained portable electronics - designed specifically for single-cell Li-ion applications where simplicity, accuracy, and minimal external components are critical.

FAQ

What is the exact regulated output voltage of the MCP73827-4.2VUATR?

The MCP73827-4.2VUATR is factory-trimmed to deliver a constant-voltage regulation of 4.2 V with ±1% accuracy over the full -20°C to +85°C temperature range and 4.5 V to 5.5 V input supply. This value is fixed and non-adjustable, matching standard graphite-anode lithium-ion cell requirements.

How does the MCP73827-4.2VUATR handle deeply depleted batteries?

The MCP73827-4.2VUATR automatically enters preconditioning mode when the battery voltage at VBAT falls below ~2.4 V, applying a reduced charge current scaled to approximately 43% of the programmed fast-charge peak. This protects cell integrity and minimizes heat dissipation in the external P-MOSFET during initial recovery.

Can the MCP73827-4.2VUATR operate without a microcontroller?

Yes, the MCP73827-4.2VUATR is designed for stand-alone operation: it executes the full CC/CV charge algorithm autonomously, uses the MODE pin to drive an LED directly, and terminates charge based on timer or IMON threshold detection - no microcontroller is required for basic functionality.

What external components are mandatory for the MCP73827-4.2VUATR?

Mandatory components include: an external P-channel MOSFET (e.g., NDS8434), a precision current-sense resistor (R_SENSE) for setting charge current, ≥10 µF capacitor from VBAT to GND for loop stability, and ≥10 µF capacitor from VIN to GND. The SHDN pin may be tied to VIN for automatic enable.

Does the MCP73827-4.2VUATR support battery temperature monitoring?

No, the MCP73827-4.2VUATR does not include built-in temperature sensing or JEITA-compliant thermal regulation. It operates across -20°C to +85°C ambient, but battery temperature must be monitored externally if required - unlike some newer chargers with NTC input or thermal foldback.