The charge current is set via the I2C interface, so the host MCU can adjust the rate dynamically — useful for thermal management or fast-charge profiles.
I2C control and fault protection
All charge parameters — current, voltage, termination — are written over the I2C bus, eliminating the need for external programming resistors. The part includes over-temperature and over-voltage fault protection, which is essential for safe Li-ion charging in systems where the host may lose control.
Maximum supply voltage is 10 V, so a 5 V USB bus or a 9 V wall adapter both fit without a pre-regulator.
Housed in a 24-VFQFN with exposed pad (4x4 mm), the BQ24161BRGET requires a thermal land pattern on the PCB to sink heat from the 2.5 A charge pass element. The supplier device package is 24-VQFN (4x4).