Microchip Technology MCP73114T-0NSI/MF

Overview

MCP73114T-0NSI/MF from Microchip Technology is a single-cell Li-ion/Li-polymer linear battery charge management controller with integrated pass transistor, input overvoltage protection (5.8 V), and resistor-programmable fast charge current (130–1100 mA). It delivers ±0.5% voltage regulation at 4.20 V across –5°C to +55°C and supports automatic recharge at 95% V_REG, thermal regulation, and 32-minute precondition timer - deployed in USB-powered portable media players and Bluetooth headsets.

For engineers reviewing the MCP73114T-0NSI/MF datasheet, MCP73114T-0NSI/MF pinout, MCP73114T-0NSI/MF application, or MCP73114T-0NSI/MF equivalent, key selection criteria include OVP threshold (5.8 V), factory-set 4.20 V charge voltage, Type 1 status output behavior, DFN-10 (3 mm × 3 mm) thermal pad package, and compatibility with low-cost wall adapters up to 18 V absolute maximum input.

Technical Context

The MCP73114T-0NSI/MF implements a three-phase linear charging algorithm: preconditioning (10% I_REG, 32 min max), constant-current fast charge (programmed via R_PROG), and constant-voltage regulation (4.20 V ±0.5%). Its internal P-channel MOSFET features 350 mΩ typical R_DS(ON) at 105°C, enabling direct battery connection without external FETs.

Protection logic includes input overvoltage lockout at 5.8 V (hysteresis 150 mV), undervoltage lockout at 4.15 V (100 mV hysteresis), thermal shutdown at 150°C (10°C hysteresis), and battery short-circuit detection at 1.7 V. The STAT pin provides open-drain status signaling with high-Z during shutdown/standby/charge-complete and active-low during active charging phases.

Key Specifications

Pinout & Package

Package: DFN-10 (3 mm × 3 mm) with exposed thermal pad (EP); requires solder connection to PCB ground plane for thermal management and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP73114T-0NSI/MF, MCP73113-06S/MF offers higher OVP tolerance but identical charge algorithm and timing, while BQ24075RGTR trades programmability and preconditioning for integrated LDO functionality and simpler current setting - making it suitable for cost-optimized systems without deep-discharge recovery requirements.

Availability

MCP73114T-0NSI/MF is available at Aetrix Electronics and suitable for USB chargers, Bluetooth headsets, and digital still cameras requiring stable component supply, long-term lifecycle support, and consistent factory-trimmed 4.20 V regulation accuracy.

Supply support for MCP73114T-0NSI/MF 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 devices, and battery management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP73113/4 product line was designed specifically for cost-sensitive, space-constrained portable Li-ion/Li-polymer battery charging applications - integrating protection, regulation, and status functions into a single DFN-10 package without requiring external MOSFETs or complex firmware.

FAQ

What is the OVP threshold for MCP73114T-0NSI/MF, and how does it affect system design?

The MCP73114T-0NSI/MF has a fixed 5.8 V overvoltage protection (OVP) threshold with 150 mV hysteresis. This allows safe operation with common 5 V USB sources while protecting against transient spikes from low-cost wall adapters. Designers must ensure input voltage never exceeds 5.8 V continuously - if higher input rails are needed, MCP73113-06S/MF (6.5 V OVP) is the direct alternative. The OVP circuit places the device in shutdown mode until VDD falls below 5.65 V.

How is the fast charge current programmed on MCP73114T-0NSI/MF?

The fast charge current for MCP73114T-0NSI/MF is set using a single resistor (R_PROG) connected between the PROG pin and VSS. The relationship follows I_REG ≈ 1104 / R_PROG (with R_PROG in kΩ and I_REG in mA), supporting 130–1100 mA. For example, a 2.0 kΩ resistor yields ~550 mA. R_PROG values between 1 kΩ and 21 kΩ are valid; impedance >200 kΩ disables charging entirely.

Does MCP73114T-0NSI/MF support automatic recharge, and at what threshold?

Yes, MCP73114T-0NSI/MF supports automatic recharge at 95% of its factory-set 4.20 V regulation voltage, i.e., approximately 4.00 V. When the battery voltage drops to this level after charge completion, the device automatically restarts the full CC/CV cycle. This feature is enabled by default in the -0NSI/MF variant and eliminates manual intervention for devices left idle between uses.

What is the function of the STAT pin on MCP73114T-0NSI/MF, and what status modes does it support?

The STAT pin on MCP73114T-0NSI/MF is an open-drain output providing real-time charge status: low during preconditioning, fast charge, and constant-voltage phases; high-impedance during shutdown, standby, and charge-complete states. As a Type 1 variant, it asserts high-Z (not flashing) during faults. It can drive an LED directly with a pull-up resistor or interface to a microcontroller GPIO for firmware monitoring.

Can MCP73114T-0NSI/MF operate without an external current-sense resistor?

Yes, MCP73114T-0NSI/MF integrates all current sensing internally - no external sense resistor is required. The PROG pin serves dual purpose: setting fast charge current via R_PROG and acting as the current-sense feedback node. This integration reduces BOM count, PCB area, and potential errors from external resistor tolerance or layout parasitics, distinguishing it from controllers requiring discrete sense elements.