This part is a kind of semiconductor called PAM8403.

Function of this product has Filterless 3W Class-D Stereo Audio Amplifier.

Manufacturers : Power Analog Micoelectronics

Image and pinout :

Some of the text within the PDF file :

PAM8403 Filterless 3W Class-D Stereo Audio Amplifier Key Features www.datasheet4u.com General Description The PAM8403 is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve highquality sound reproduction. The new filterless architecture allows the device to drive the speaker directly, requiring no low-pass output filters,thus to save the system cost and PCB area. With the same numbers of external components, the efficiency of the PAM8403 is much better than that of class-AB cousins. It can extend the battery life, ideal for portable applications. The PAM8403 is available in SOP-16 package. n 3W Output at 10% THD with a 4 Ω Load and 5V Power Supply n Filterless, Low Quiescent Current and Low EMI n Low THD+N n Superior Low Noise n Efficiency up to 90% n Short Circui [ ... ]

PAM8403 PDF Datasheet Download