This part is a kind of semiconductor called BA5210FS.

Function of this product has Speaker / headphone switch power amplifier.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

Audio ICs Speaker / headphone switch power amplifier BA5210FS The BA5210FS is a power amplifier with a built-in monaural speaker / stereo headphone switch. The speaker drive is BTL for large output, and when the headphones are connected, the “center-amp” design means that coupling is not required. This significantly reduces the number of external components required, and makes this IC ideal for compact sets that have high component density. Mute and standby functions are provided, and direct microprocessor control is possible. FApplications Notebook computers, electronic books, portable CD players, video cameras with built-in monitors, LCD TVs, radios, and electronic instruments FFeatures 1) Built-in BTL / stereo switch circuit. 2) Mute function. 3) Standby function. FBlock diagram 4 [ ... ]

BA5210FS PDF Datasheet Download