USB-powered single-cell Li-Ion charger in 16-VQFN
The BQ24232RGTR is a single-cell Li-Ion battery charger from Texas Instruments, designed to draw power directly from a USB port.
Charge current, timer, and fault protection
Charge current is set by an external resistor — the constant-programmable method lets the BOM engineer choose the rate per cell capacity. A programmable timer backs up the termination; if the battery never reaches 4.2 V within the window, the part stops charging rather than cook the cell. Fault protection covers over-temperature, over-voltage, reverse current, and short circuit — four conditions that cover the common failure modes in a portable device: a stalled fan, a hot-plug surge, a dead battery sinking current, or a solder bridge on the output.
The base product number BQ24232 shares the same die and package family — if a future revision appears, the RGTR suffix will carry the change.