MCP73827

The MCP73827 is a linear charge management controller for use in space-limited, cost sensitive applications. The MCP73827 combines high accuracy constant voltage, controlled current regulation, cell preconditioning, and charge status indication in a space saving 8-pin MSOP package. The MCP73827 provides a stand-alone charge management solution.

The MCP73827 charges the battery in three phases: preconditioning, controlled current, and constant voltage. If the battery voltage is below the internal low-voltage threshold, the battery is preconditioned with a foldback current. The preconditioning phase protects the lithium-ion cell and minimizes heat dissipation.

Following the preconditioning phase, the MCP73827 enters the controlled current phase. The MCP73827 allows for design flexibility with a programmable charge current set by an external sense resistor. The charge current is ramped up, based on the cell voltage, from the foldback current to the peak charge current established by the sense resistor. This phase is maintained until the battery reaches the charge-regulation voltage.

Then, the MCP73827 enters the final phase, constant voltage. The accuracy of the voltage regulation is better than +1% over the entire operating temperature range and supply voltage range. The MCP73827-4.1 is preset to a regulation voltage of 4.1V, while the MCP73827-4.2 is preset to 4.2V. The charge status output, MODE, indicates when the charge cycle has transitioned to constant voltage mode. The charge cycle can be terminated by a timer that is started when the MODE pin goes to a logic High or by monitoring the charge current monitor output, I_MON, for a minimum current.

The MCP73827 operates with an input voltage range from 4.5V to 5.5V. The MCP73827 is fully specified over the ambient temperature range of -20°C to +85°C.