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MCP73831T-2ACI/OT

500 mA single-cell Li-Ion charger, 4.2 V fixed, SOT-23-5, integrated pass transistor

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Manufacturer Part：

MCP73831T-2ACI/OT

Package：

SOT-23-5 (3.10 x 1.80 x 1.45 mm)

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Description

Product Overview

The MCP73831T-2ACI/OT from Microchip Technology is a miniature single-cell Li-Ion/Li-Polymer charge management controller in a 5-lead SOT-23 package. It features an integrated pass transistor, current sensing, and reverse discharge protection with a fixed 4.2 V regulation voltage and +/-0.75% accuracy. The device supports programmable charge current up to 500 mA.

Key Specifications

Regulation Voltage 4.2 V
Voltage Accuracy +/-0.75%
Max Charge Current 500 mA (programmable)
Input Voltage Range 3.75 V to 6 V
Battery Type Single-cell Li-Ion/Li-Polymer
Charge Status Output Tri-state (drives LED directly)
Thermal Regulation Yes (on-chip)
Operating Temperature -40°C to 85°C

Features

  • Integrated pass transistor and current sense resistor
  • High accuracy preset voltage regulation: +/-0.75%
  • Programmable charge current via external resistor
  • Charge status output (tri-state) can directly drive LED
  • On-chip thermal regulation for reliable operation
  • Selectable preconditioning and end-of-charge ratio
  • Reverse discharge protection (no external blocking diode)
  • Tiny 5-lead SOT-23 package for space-limited designs

Applications

  • Portable devices (smartphones, tablets, wearables)
  • USB-powered charging from PC or wall adapter
  • Wireless sensor nodes and IoT devices
  • Handheld instruments and medical devices

The MCP73831T-2ACI/OT is a miniature linear charge management controller from Microchip Technology, specifically designed for single-cell Li-Ion and Li-Polymer batteries in space-constrained applications. The -2ACI variant provides a fixed 4.2 V regulation voltage with +/-0.75% accuracy, making it compatible with standard 4.2 V Li-Ion cells. The device integrates the pass transistor and current sensing element, requiring only two external components: a programming resistor for charge current and a decoupling capacitor. The charge current is programmable up to 500 mA via a single resistor on the PROG pin. A tri-state status output can directly drive an LED to indicate charge in progress, charge complete, or high-impedance state. On-chip thermal regulation automatically reduces the charge current when the junction temperature exceeds the thermal regulation threshold, preventing thermal runaway in high-power or high-ambient-temperature conditions.

The MCP73831T-2ACI/OT operates through four charge phases: (1) The preconditioning phase applies a reduced current (typically 10% of the programmed value) when the battery voltage is below the preconditioning threshold, safely recovering deeply discharged cells. (2) The constant-current (CC) phase delivers the full programmed charge current set by the PROG resistor, during which the battery voltage rises steadily. (3) The constant-voltage (CV) phase maintains the output at 4.2 V with +/-0.75% accuracy while the charge current tapers off as the cell approaches full charge. (4) The charge termination phase ends charging when the current drops below the end-of-charge ratio (selectable by the -A variant). The on-chip thermal regulation loop monitors junction temperature and reduces the charge current if the die exceeds approximately 115°C, ensuring safe operation under all conditions. Reverse discharge protection prevents battery drain back through the input when the input supply is removed.

Pin No. Pin Name Function
1 STAT Charge status output (tri-state: low = charging, high-impedance = complete, high = disabled/fault)
2 VSS Ground
3 VBAT Battery connection / charge output
4 VDD Input supply voltage (3.75 V to 6 V)
5 PROG Charge current programming resistor connection
  • USB-powered portable devices requiring compact Li-Ion charging with direct LED status indication
  • Wearable electronics and fitness trackers where the SOT-23-5 footprint minimizes board area
  • Wireless IoT sensor nodes with single-cell Li-Po batteries charged from solar or USB sources
  • Handheld medical instruments needing reliable thermal-regulated charging with reverse discharge protection
Model Brand Vreg Max Current Package
MCP73831T-2DCI/OT Microchip 4.2 V 500 mA SOT-23-5
MCP73832T-2ACI/OT Microchip 4.2 V 500 mA SOT-23-5
MCP73871T-2AAI/ML Microchip 4.2 V 1 A DFN-8
TP4056 Nanjing TopPower 4.2 V 1 A SOP-8
MAX1811EEUB+ ADI 4.1/4.2 V 500 mA uMAX-8
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Service & Packaging

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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