This part is a kind of semiconductor called XPT9911.

Function of this product has AB / Class D power amplifier.

Manufacturers : XPT

Image and pinout :

Some of the text within the PDF file :

XPT9911 z z z z z z z~ z z z z z z z · · · ·LCD · · DVD / PDA USB 2.1/2.0 XPT9911 2 MODE 4 INN 16 VBYP Bias and Reference 15 PDN 5 VDD Class AB/D Modulator MODE Control PVDD 12,13 Gate OUTP 6,7 Driver OUTN 10,11 PGND 8,9 Internal Oscillator Thermal OV Protection Protection GND 14 sales@xptek.cn R3-A 5 www.xptek.cn ; support@xptek.cn szxpt168 design@xptek.cn XPT9911ES ESOP16 PCS 2.5K PGND AB sales@xptek.cn ESOP16 R3-A 5 www.xptek.cn ; support@xptek.cn szxpt168 design@xptek.cn CTRL MODE CAP INN VDD OUTP PGND OUTN PVDD GND PDN VBYP 1 2 3 4 5 6,7 8,9 10,11 12,13 14 15 16 I/O I I O O I O sales@xptek.cn R3-A 5 www.xptek.cn ; support@xptek.cn szxpt168 design@xptek.cn ESOP16 ESOP-16 sales@xptek.cn R3-A 5 www.xptek.cn ; support@xptek.cn szxpt168 des [ ... ]

XPT9911 PDF Datasheet Download