MCP73831 Charge Management Controller
Overview
The Boardoza MCP73831 is a fully integrated, linear charge management solution designed specifically for single-cell Lithium-Ion and Lithium-Polymer battery chemistries. Built around the industry-standard Microchip MCP73831 engine, this module employs a constant-current/constant-voltage (CC/CV) charging algorithm with integrated thermal regulation, ensuring safe and efficient energy replenishment.
Featuring a modern USB Type-C interface alongside redundant solder pads, it provides a versatile power entry point for portable embedded systems, wearable electronics, and battery-backed IoT nodes. Its compact form factor and low external component count make it an ideal drop-in solution for space-constrained designs.
Core Technical Specifications
The module is characterized by the following operational parameters:
Charging Topology: Linear regulation utilizing a CC/CV algorithm for safe and complete battery termination.
Input Voltage Range: Compliant with standard USB bus voltages, operating reliably between 3.75V and 6V DC.
Battery Compatibility: Specifically calibrated for single-cell Li-Ion or Li-Po cells with a standard 4.2V charge termination voltage.
Charge Current: Configured by default for 500 mA throughput, with adjustability possible via the onboard R3 programming resistor.
Thermal Endurance: Rated for industrial operating temperatures ranging from -40°C to +85°C.
Key Engineering Features
Precision Linear Architecture
The module employs a high-accuracy linear control loop to regulate voltage within strict tolerances (typically ±0.75%). Unlike switching regulators, this linear topology generates negligible electromagnetic interference (EMI), making it the preferred choice for powering noise-sensitive RF communication modules and precision audio circuits.
Dual-Input Power Interface
To maximize integration flexibility, the board offers two distinct power entry methods:
USB Type-C Receptacle: Facilitates immediate plug-and-play charging from standard USB PD sources and wall adapters.
Solderable Power Pads: Allows for permanent, vibration-resistant hardwiring into custom chassis or power distribution buses.
Integrated Thermal Regulation
Safety is paramount in lithium battery management. The onboard controller features continuous thermal feedback. If the die temperature approaches its thermal limit due to high power dissipation, the charge current is automatically throttled back. This "thermal foldback" mechanism ensures the longevity of the silicon without suspending the charging cycle, eliminating the need for external heat sinks.
Hardware Interface and Connectivity
The module simplifies battery integration through a clearly defined physical interface:
Power Input The primary power input is handled via the onboard USB Type-C connector, accepting standard 5V USB bus power.
Battery Output Terminals Direct battery connection is achieved through high-current solder pads located at the board edge:
Positive Terminal (+): Connects to the Battery Anode (VBAT). This path delivers the regulated charge current to the cell.
Negative Terminal (–): Connects to the Battery Cathode (GND). This serves as the common return path for the system.
Mechanical Specifications
The device is housed in an ultra-compact footprint measuring 20 mm x 40 mm, designed to fit within the tight spatial constraints of modern enclosure designs.
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