1.5 A charge current for single-cell Li-Ion charging
The BQ24072TRGTR from Texas Instruments is a single-cell Li-Ion battery charger IC that targets portable and handheld designs where a USB port or a 5 V wall adapter supplies the charging rail. The 1.5 A maximum charge current sets the charge-time floor for a typical 1000 mAh to 2000 mAh cell — expect a full charge in roughly one to two hours at the constant-current stage. The IC integrates a pass transistor and current-sense resistor, so the external BOM stays lean: just a few capacitors and the programming resistor for the charge current.
Protection set and programmable features
Fault protection covers over-temperature, over-voltage, reverse current, and short circuit — four conditions that cover the common failure modes in a single-cell charging path. The over-voltage protection clamps the battery voltage at 4.2 V, matching the standard Li-Ion termination voltage. The reverse-current block prevents the battery from back-driving the input when the supply is removed. Programmable features include the charge current and a safety timer, both set with external resistors. The timer provides a backup termination in case the battery never reaches the 4.2 V threshold — useful for deeply discharged cells.
The part comes in a 16-VFQFN exposed pad package, 3 mm × 3 mm body (supplier device package 16-VQFN). Supply voltage max is 6.4 V, which covers USB VBUS (5 V nominal) with margin for cable drop and transient overshoot.