The MP2667 is a highly integrated, single-cell, Li-ion/Li-polymer battery charger with system power path management for space-limited portable applications. The MP2667 takes input power from either an AC adapter or a USB port to supply the system load and charge the battery simultaneously. The charger function features constant current pre-charge, constant current fast charge (CC) 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, battery or both to power the system. This power stage features a low-dropout regulator from the input to the system and a 100mohm 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.