This part is a kind of semiconductor called MT4953A.

Function of this product has Dual 30 P-Channel Power MOSFET.

Manufacturers : MOS TECH

Image and pinout :

Some of the text within the PDF file :

w w w . D a t a S h e e t . c o . k r 07$ MOS-TECH Semiconductor Co.,LTD Sep 20 07$ Dual 30 P-Channel PowerMOSFET General Description This P-Channel MOSFET has been designed specifically to improve the overall efficiency of DC/DC converters using either synchronous or conventional switching PWM controllers, and battery chargers. These MOSFETs feature faster switching and lower gate charge than other MOSFETs with comparable RDS(ON) specifications. The result is a MOSFET that is easy and safer to drive (even at very high frequencies), and DC/DC power supply designs with higher overall efficiency.  Features x –5.9 A, –30 V. RDS(ON) =  m: @ VGS = –10 V RDS(ON) =  m: @ VGS = – 4.5 V x Extended VGSS range (–25V) for battery applications x ESD protection diode (note [ ... ]

MT4953A PDF Datasheet Download