This part is a kind of semiconductor called S5250M.

Function of this product has Low Drop Output Voltage Regulator.

Manufacturers : AUK

Image and pinout :

Some of the text within the PDF file :

Semiconductor S52xxM Low Drop Output Voltage Regulator Description The S52xxM is a u-cap 150mA linear voltage regulator in the SOT-25 package. This regulator has very low dropout voltage and very low ground current. It is designed especially for hand-sets, battery-powered devices and can be controlled by a CMOS or TTL. When the S52xxM is disabled, power consumption drops to nearly zero. Features www.DataSh•eeOt4uUt.cpoumt current of 150 ㎃ • Low quiescent current • Low dropout voltage • Current limit protection • Logic-controlled electronic enable Ordering Information Type NO. Marking Package Code S52xxM 5□□ □□: Voltage Code SOT - 25 Outline Dimensions (Unit : mm ) BLOCK DIAGRAM VI 1 Control 3 Bias Circuit + - Bandgap Reference Current Limit Circuit 2 [ ... ]

S5250M PDF Datasheet Download