MP2661

The MP2661 is a highly integrated, single-cell, lithium-ion (Li-ion) and lithium-polymer (Li-polymer) battery charger with system power path management for space-limited, portable applications. The MP2661 uses input power from either an AC adapter or a USB port to supply the system load and charge the battery independently. The charger features constant current pre-charge (PRE.C), constant current (CC) fast charge, and constant voltage (CV) regulation, charge termination, and auto-recharge. The power path management function ensures continuous power to the system by automatically selecting the input, the battery, or both to power the system. This power stage features a low dropout regulator from the input to the system and a 100mΩ switch from the battery to the system. Power path management separates the charging current from the system load, which allows for proper charge termination and keeps the battery in full-charge mode. The MP2661 provides short-circuit protection (SCP) by limiting the current from the input to the system, and the battery to the system. SCP protects the Li-ion battery from being damaged by excessively high currents. If the battery voltage (VBATT) drops below its configurable under-voltage lockout (UVLO) threshold, then the path between the battery and the system is cut off to prevent the Li-ion battery from being over-discharged. An integrated I2C control interface allows the MP2661 to program the charging parameters, such as the input current limit (IIN_LIM), minimum input voltage (VIN_MIN) regulation, charging current, battery regulation voltage, safety timer, and battery UVLO. The MP2661 is available in a WLCSP-9 (1.55mmx1.55mm) package.