500 mA charge ceiling — sized for small single-cell packs
The BQ24025DRCR is a single-cell Li-ion/polymer linear charger from TI's bqTINY™-II family, with a maximum charge current of 500 mA. It terminates at 4.2 V, the standard full-charge voltage for most single-cell Li-ion/polymer chemistries. The input is USB-compatible, rated up to 6.5 V, so it can run directly off a 5 V USB port or a regulated wall adapter without an extra pre-regulator. The charge current is programmable via an external resistor, and the timer provides a safety backup termination.
The exposed pad on the 10-VSON (3x3 mm) package helps pull heat out of the die when charging at the full 500 mA in a warm ambient. Fault protection includes over-temperature shutdown, which prevents the die from exceeding the safe junction limit if the ambient temperature rises or the thermal pad is not properly soldered to the PCB copper plane.
Active lifecycle — no obsolescence pressure
The 10-VSON package is a common footprint, and the base product number BQ24025 spans multiple current options if a design later needs a higher or lower charge rate.