1.5 W mono plus headphone drive in a BGA
The LM4855ITL is a Texas Instruments Boomer® Class AB audio amplifier that delivers 1.5 W into a 4 Ω mono speaker while simultaneously driving stereo headphones from a single 18-WFBGA package.
Housed in an 18-bump WFBGA (supplier device package 18-uSMD, 1.97 x 2.23 mm), this part is a fine-pitch BGA — not a hand-solder job. Rework requires a hot-air station with a nozzle sized to the die, and the board must have a soldermask-defined pad pattern that matches the bump layout. The package is surface-mount only; no through-hole variant exists. Orientation is marked by pin-1 indicator on the substrate — verify it under magnification before placing the part.
RoHS compliance is not claimed for this part number (listed as RoHS non-compliant), so it may contain lead in the solder bumps or package finish — factor this into your material declaration and any regional regulatory requirements.