Single-cell Li-ion charger with I²C control
The Texas Instruments BQ24180YFFR is a single-cell Li-ion or Li-polymer battery charger that handles up to 1.5 A of charge current. It communicates over an I²C bus, so the host microcontroller sets the charge voltage, current, and termination parameters — no external resistors needed for the charge profile. The part integrates over-temperature and over-voltage fault protection, which saves board space by eliminating external supervisor ICs on the battery rail.
Supply rail and thermal design
The maximum supply voltage is 16 V, which covers USB VBUS (5 V) and common 12 V wall adapters without an external pre-regulator. The battery regulation voltage tops out at 4.44 V — that is the standard termination for a single-cell Li-ion at 4.2 V nominal plus a small top-off window. Operating temperature spans -30°C to 85°C, so the part works in portable consumer gear, handheld instruments, and indoor industrial equipment. It is not rated for automotive under-hood or extended outdoor enclosures where ambient exceeds 85°C.
Package and footprint for reflow
The BQ24180YFFR comes in a 25-bump DSBGA package (0.5 mm pitch, 25-UFBGA). The small footprint suits space-constrained portable designs, but the fine pitch demands a controlled reflow profile and a solder-mask-defined pad layout. The supplier device package is 25-DSBGA. It ships on Tape & Reel for automated pick-and-place; Cut Tape quantities are also available for prototype builds.