bq2425x Switch-Mode Li-Ion Battery Charger Texas Instruments bq2425x 2A Single Input Switch-Mode Li-Ion Battery Charger is a highly integrated single-cell Li-Ion battery charger and system power-path management device targeted for space-limited, portable applications with high capacity batteries. The single cell charger has a single input that operates from either a USB port or AC wall adapter for a versatile solution. Typical applications include smart phones, MP3 players, portable media players, and handheld devices.