This part is a kind of semiconductor called BD4912.

Function of this product has DMOS System Power Supply.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

www.DataSheet.co.kr TECHNICAL NOTE System Power Supply LSI Series for Use in Automotive Electronics DMOS System Power Supply ICs with low current consumption Now available ESD Resistance BD4912/BD4912-V4 zDescription The BD4912/BD4912-V4 provides multiple supply voltage outputs for use in car audio and satellite navigation systems with CD player, radio, antenna, lighting, and other components. In addition to overcurrent, overvoltage, and thermal shutdown circuits, it incorporates circuitry for reacting to sudden BATTERY power failures and is ideal for car audio and satellite navigation systems. With its 110 µA (max.) standby current, the BD4912/BD4912-V4 delivers low current consumption when the BATTERY is off. zFeatures 1) Built-in power supplies for car audio and satellite navigati [ ... ]

BD4912 PDF Datasheet Download