TS4851 Mono 1W Speaker and Stereo 160mW Headset BT.
STMicroelectronics
TS4851 - MONO 1W SPEAKER AND STEREO 160 mW HEADSET BTL DRIVERS
TS4851 Mono 1W Speaker and Stereo 160mW Headset BTL Drivers with Digital Volume Control ■ Operating from VCC = 3V to 5.5V Pin Connections (top view).