Single-cell Li-Ion charger with I²C control
The Texas Instruments BQ24298RTWT is a single-cell Lithium Ion/Polymer battery charger that takes its charge parameters over an I²C interface. It handles up to 3 A of programmable charge current and targets a 4.2 V battery pack voltage. The device integrates overcurrent, overtemperature, and overvoltage fault protection — the kind of safety set you want when the battery pack is right next to the user's hand.
3 A charge current and thermal reality in a 4×4 mm QFN
The 3 A max charge current is the headline number, but in a 24-WFQFN with exposed pad (4×4 mm body), the real-world sustained current depends on board copper area and airflow. The I²C interface lets the host read the charger status and adjust the current down if the die temperature climbs — that is the practical way to keep the part inside its SOA without oversized copper.