2A programmable charge current for 1-cell Li-Ion packs
The BQ24250YFFT is a single-cell Li-Ion linear charger from Texas Instruments that delivers up to 2A charge current. The current is set via an external resistor or programmed through the I²C interface, so you can adjust the charge profile in firmware without changing a resistor on the board. The input supply range extends to 10.5V max, which covers standard 5V USB sources and 9V wall adapters. The charger terminates at a regulated 4.2V battery pack voltage.
I²C control and fault protection for reliable charging
The I²C bus lets the host microcontroller set the charge current, termination threshold, and timer limits. This is useful when the same hardware must charge different cell capacities — just change a register value. On-chip fault protection covers over-current, over-temperature, and over-voltage conditions. The charger enters a safe state and reports the fault via the I²C status register.
Industrial temperature range and active production status
Texas Instruments lists this part as Active in production. The part is ROHS3 compliant.
30-bump DSBGA package — layout considerations
The 30-DSBGA package is a wafer-level chip-scale package with 0.4 mm ball pitch. The small footprint saves board space, but the fine pitch demands a well-designed stencil and a solder profile that matches the package's moisture sensitivity level.