That 28 V maximum input rating gives real headroom for unregulated wall adapters or industrial DC rails, not just a clean 5 V USB port — the part won't latch up or blow if the input spikes during hot-plug or a transient. Charge current is set with a single resistor, so you tune the rate to your cell capacity and thermal budget. The 0°C to 125°C junction range covers most indoor and industrial gear, but note the lower limit: this part does not charge below 0°C, so it is not a fit for outdoor cold-start or automotive under-hood without a pre-heat strategy.
Fault protection and USB compatibility
Built-in protection covers over-temperature, over-voltage, and short circuit on the output. For a single-cell Li-Ion charger, over-voltage protection is the critical one: it prevents the cell from being driven above 4.2 V if the feedback loop breaks or the programming resistor opens. The USB interface label means the part is designed to work from a USB VBUS supply, but it does not implement USB BC1.2 detection or negotiate current — you set the current limit externally.
It is a current-production TI catalog device, not a phase-out or last-time-buy. For dual-sourcing or supply resilience, the BQ24050DRCR is the same die in a different package variant (10-SON vs 10-WSON); the DSQR suffix specifies the 10-WSON (2x2 mm) package with exposed pad.