Microchip MCP73831T-2DCI/OT: A Compact and Efficient Linear Charging Solution for Single-Cell Li-Ion/Li-Polymer Batteries

The Microchip MCP73831T-2DCI/OT is a highly integrated, advanced linear charge management controller designed for space-constrained and cost-sensitive applications. This controller is meticulously engineered to simplify the charging process for single-cell Lithium-Ion (Li-Ion) or Lithium-Polymer (Li-Polymer) batteries, ensuring safe, precise, and efficient power delivery. Its miniature SOT-23-5 package makes it an ideal choice for portable electronics such as Bluetooth headsets, wearable devices, handheld instruments, and other compact consumer gadgets.

A key strength of the MCP73831T-2DCI/OT lies in its exceptional integration. The device incorporates a pass transistor, current sense circuitry, and a highly accurate voltage regulation circuit within a single package. This high level of integration drastically reduces the external component count, simplifying PCB design and minimizing the overall solution footprint. The controller employs a constant-current/constant-voltage (CC/CV) charge algorithm with automatic charge termination, which is critical for maximizing battery capacity and longevity. The -2 variant is preconfigured for a 4.2V regulation voltage, the standard for most single-cell Li-Ion chemistries.

Furthermore, the device is packed with robust safety and management features. It includes thermal regulation to automatically reduce the charge current if the internal junction temperature exceeds ~110°C, preventing damage to the IC under high power dissipation or elevated ambient temperature conditions. Additional built-in protections guard against reverse polarity, short-circuit, and over-current conditions, providing a comprehensive safety net for both the battery and the end equipment.

ICGOOODFIND Summary: The MCP73831T-2DCI/OT stands out as an optimal solution for designers seeking a miniature, fully-featured, and reliable linear battery charger. Its high level of integration, adherence to the precise CC/CV charging profile, and suite of protective features make it a superior choice for ensuring the safe and efficient operation of modern portable electronic products.

Keywords: Linear Battery Charger, Li-Ion/Li-Polymer, Constant-Current/Constant-Voltage (CC/CV), Thermal Regulation, SOT-23 Package.