MCHPMCP73811T-420I/OT
Overview
The MCP73811T-420I/OT is a compact, single-cell Lithium-Ion/Lithium-Polymer charge management controller designed for space-constrained applications. It features a constant current/constant voltage (CC/CV) charge algorithm with an integrated pass transistor and current sensing, eliminating the need for external sense resistors or blocking diodes. The device is factory-preset to a 4.2V regulation voltage and provides an active-high charge enable pin for digital control.
Why Choose This Part
This IC simplifies design by integrating the pass transistor and reverse discharge protection into a tiny SOT-23 package. It offers high-accuracy voltage regulation within 1 percent and includes thermal regulation to maintain maximum charging rates without exceeding safe silicon temperatures. The external end-of-charge control allows firmware to manage the termination process via the CE pin.
Applications
Key Specifications
Getting Started
To implement this charger, connect the VDD pin to a 5V source with a 1uF bypass capacitor and the VBAT pin to the battery anode. The CE (Charge Enable) pin must be pulled high to initiate charging; this can be tied to VDD for autonomous operation or driven by a GPIO for logic control. Ensure the PCB layout provides adequate copper area at the GND pin to act as a heat sink for the internal pass transistor.
