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the fp6908 is a single-cell li-ion/li-polymer battery charger ic which can be operated with an input voltage as low as 3.9v. the fp6908 can work with various types of ac adapters.
the fp6908 can also be operated as a linear charger when the ac adapter is a voltage source. the battery is charged in a cc/cv (constant current/constant voltage) profile. the charge current is programmable with an external resistor up to 1.0a with sop-8 (exposed pad), tdfn-8 (2mmx2mm) packages and 500ma with sot-23-5 packages. the fp6908 can also work with a current-limited adapter to minimize the thermal dissipation.
the fp6908 is designed with charge current thermal fold-back function to guarantee safe operation when the printed circuit board is space limited for thermal dissipation. a negative temperature coefficient (ntc) thermistor is connected between the ntc and gnd to monitor the battery or ambient temperature.