Single-cell Li-Ion charger with 1A ceiling and 28V input tolerance
The Texas Instruments BQ24041DSQT is a single-cell linear charger for Li-Ion and Li-Polymer battery packs, delivering a programmable constant charge current up to 1A max. It accepts an input supply up to 28V, which gives headroom for 5V USB or unregulated wall adapters without an external pre-regulator. The 4.2V battery termination voltage matches standard single-cell Li-Ion chemistry.
Protection set for safe charging
Built-in fault protection covers over-voltage on the input, over-temperature on the die, and short-circuit at the battery output. These are hardwired thresholds — no external supervisor needed. The charger enters thermal regulation if the junction hits the limit, reducing current to keep the die safe.
Package and footprint for compact designs
Housed in a 10-WFDFN with exposed pad (10-WSON, 2x2 mm body), the part is surface-mount and requires a thermal pad on the PCB for heat sinking. The small footprint suits space-constrained portable devices.