Single-cell Li-ion charger with USB power path
The BQ24165YFFT: It manages the charge cycle for one lithium-ion cell, delivering a programmable constant charge current up to 2.5 A max. Operating from a supply up to 10 V, the device integrates fault protection against over-temperature and short-circuit conditions, which covers the most common failure modes in a charging path — a runaway cell or a shorted USB cable.
Charge current and thermal envelope
The 2.5 A max charge current is programmable, so the designer sets the charge rate to match the cell capacity and the thermal budget of the 49-DSBGA package. At full current, the package's 2.8x2.8 mm footprint relies on the PCB copper for heat spreading — the thermal pad on the DSBGA lands must connect to a solid ground plane to keep the junction below the 125 °C limit during constant-current phase. The USB interface means the input source is a standard 5 V USB bus or a dedicated charging port that negotiates the current limit.
Package and assembly considerations
The supplier device package is listed as 49-DSBGA (2.8x2.8), which is the body size. The surface-mount mounting type is standard for this package; no special handling beyond normal moisture sensitivity level (MSL) precautions for a BGA is expected.
ROHS3 compliant, meeting the current EU restriction on hazardous substances. No additional compliance documentation (REACH, UL, IEC) is listed in the available records.