This part is a kind of semiconductor called RP115L331D.

Function of this product has Low On Resistance / Low Voltage 1ch 500mA/ 1.0A Alternative LDO.

Manufacturers : RICOH electronics

Image and pinout :

Some of the text within the PDF file :

RP115x SERIES Low On Resistance/ Low Voltage 1ch 500mA/ 1.0A Alternative LDO NO. EA-274-141205 OUTLINE The RP115x Series are CMOS-based positive voltage regulators featuring 500mA/ 1.0A that provide high ripple rejection, low dropout voltage, high output voltage accuracy, and low supply current. Internally, the RP115x Series consist of a voltage reference unit, an error amplifier, a resistor-net for output voltage setting, a current limit circuit, a thermal shutdown circuit, and a reverse current protection circuit. The RP115x Series uses CMOS process for achieving low supply current, low On Resistance for low dropout voltage (TYP. 0.195V (DFN1216-8, IOUT=1.0A, VSET=1.2V)) and CE function for long battery life. Excellent ripple rejection, input transient response, and load transient respon [ ... ]

RP115L331D PDF Datasheet Download