The MCP73832T-2DCI/MC: A Compact and Robust Li-Ion/Li-Polymer Charge Management Solution

In the realm of portable electronics, efficient and reliable battery charging is paramount. The Microchip MCP73832T-2DCI/MC stands out as a highly integrated, linear charge management controller designed specifically for space-constrained applications using single-cell Lithium-Ion or Lithium-Polymer batteries. This device encapsulates a complete charging system within a miniature 2x3 DFN-8 package, offering a blend of sophistication, safety, and simplicity.

Precision Charging Algorithm

The core of the MCP73832T-2DCI/MC's functionality is its pre-programmed voltage regulation of 4.2V with an accuracy of ±0.75%. This ensures the connected battery is charged to its optimal capacity without risking over-voltage conditions, which are detrimental to battery health and safety. The controller follows a precise charge sequence: trickle charge for deeply depleted cells, constant current for rapid bulk charging, and finally constant voltage for topping off the charge.

Integrated Pass Transistor and Current Regulation

A significant advantage of this controller is its high level of integration. It features an internal MOSFET pass transistor and current sense circuit, eliminating the need for external components typically required for these functions. This not only reduces the overall solution size and Bill of Materials (BOM) cost but also simplifies design-in. The charge current is set by a single external resistor, allowing designers to tailor the charging speed to their specific battery capacity, up to a maximum of 500mA.

Comprehensive Safety and Control Features

Safety is a critical design priority. The MCP73832T-2DCI/MC incorporates multiple protective features, including thermal regulation to automatically reduce charge current if the junction temperature exceeds ~110°C, preventing damage to the IC under high power dissipation or ambient temperature conditions. Additional safeguards like reverse discharge protection prevent the battery from draining back into the power supply when input power is removed. The status of the charging cycle is communicated through two open-drain status outputs, which can drive LEDs or be monitored by a microcontroller to indicate charge-in-progress, charge-complete, or fault conditions.

Designed for Manufacturing

The part number suffix "2DCI" indicates a tape and reel packaging option, making it ideal for automated assembly processes in high-volume manufacturing. Its minimal external component requirement—often just two capacitors and a current-set resistor—further accelerates production and minimizes PCB footprint.

ICGOO

In summary, the Microchip MCP73832T-2DCI/MC is a highly integrated, single-cell Li-Ion/Li-Polymer charge management controller that delivers a complete, reliable, and compact charging solution. Its combination of precision voltage regulation, internal pass transistor, programmable current, and robust safety features makes it an excellent choice for a wide array of portable consumer devices, medical instruments, and personal electronics where space, cost, and reliability are key concerns.

Keywords: Li-Ion Charger, Integrated Pass FET, Thermal Regulation, Pre-programmed Voltage, Compact DFN Package.