MCP73855-I/MF: Advanced Linear Charge Management Controller for Single-Cell Li-Ion/Li-Polymer Batteries

The MCP73855-I/MF from Microchip Technology represents a highly integrated and sophisticated solution for the precise charging of single-cell lithium-ion and lithium-polymer batteries. As a linear charge management controller, it is engineered to deliver optimal charging performance with maximum reliability and safety, making it an ideal choice for a wide array of portable and handheld electronic devices.

This controller excels in its ability to manage the complete charging cycle, which consists of three distinct phases: pre-conditioning, constant current, and constant voltage. If the battery voltage is below a pre-set threshold, the device initiates a trickle charge to safely pre-condition the deeply depleted cell. Once the voltage rises sufficiently, it transitions to the constant current phase, delivering the full programmed charge current to the battery. Finally, as the battery approaches its full voltage, the controller seamlessly switches to the constant voltage phase, tapering the current to ensure the cell is charged to its full capacity without overcharging.

A key feature of the MCP73855-I/MF is its high level of integration. The controller incorporates a built-in pass transistor and current sense circuit, significantly reducing the external component count and overall PCB footprint. This integration simplifies design-in and lowers the total bill of materials, which is crucial for cost-sensitive and space-constrained applications. Furthermore, the device offers programmable charge current via a single external resistor, providing designers with the flexibility to tailor the charging rate to specific battery capacities and thermal considerations.

Safety is paramount in battery management, and the MCP73855-I/MF is equipped with a comprehensive suite of protection features. These include thermal regulation to prevent overheating, an integrated reverse-blocking capability to protect the circuit from a faulty input source, and automatic charge termination coupled with a timer to safeguard against faulty batteries. Its status output pins provide clear indications of the charging state, allowing the host system to display charge progress to the user.

ICGOODFIND: The MCP73855-I/MF stands out as a robust, fully-featured, and space-efficient linear charge management controller. Its combination of high integration, flexible programmability, and extensive safety protections makes it an exceptional choice for designers seeking a reliable and efficient power management solution for single-cell lithium-based batteries in consumer and industrial products.

Keywords:

Linear Charger

Li-Ion Battery

Programmable Charge Current

Thermal Regulation

Integrated Pass Transistor