The LM4915LQ from National Semiconductor is a 1-channel mono audio amplifier for mono headphones in Class AB, with 0.4 W(S) output and 1 FUNC, in an 8-WQFN (2x2) package.
The LM4915LQ/NOPB from Texas Instruments is a 1-channel (mono) Class AB amplifier Integrated Circuit for mono headphones, rated 400 mW, in an 8-WQFN (2x2) package.
The LM4915LQX/NOPB from Texas Instruments is a 1-channel (mono) Class AB amplifier Integrated Circuit for mono headphones, rated 400 mW, in an 8-WQFN (2x2) package.