Single-cell Li-Ion charger with USB input
The Texas Instruments BQ24166YFFR is a single-cell Lithium Ion battery charger IC designed for USB-powered portable devices. It integrates a programmable constant-current charge path with a maximum charge current of 2.5 A, and accepts a supply voltage up to 10 V, covering standard 5 V USB and 9 V fast-charge adapters. Built-in fault protection includes over-temperature and short-circuit detection, reducing the need for external supervisory circuitry.
49-DSBGA footprint and rework considerations
The BQ24166YFFR is supplied in a 49-UFBGA, DSBGA package (49-DSBGA, 2.8x2.8 mm body). This ultra-small footprint saves board area but demands careful PCB layout: the 0.4 mm ball pitch requires a fine-line fan-out and a controlled solder-paste stencil. Reworking a DSBGA by hand is possible with a hot-air station and a stencil alignment jig, but the part's small size makes optical alignment critical — a misaligned reflow can short adjacent balls. Moisture sensitivity level (MSL) should be verified per the reel label before rework; a pre-bake at 125°C for 8 hours is typical if the floor life has been exceeded.
The Tape & Reel (TR) packaging is standard for volume production.