This part is a kind of semiconductor called AP6203A.

Function of this product has 300mA Linear Regulator.

Manufacturers : Anwell Semiconductor

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Some of the text within the PDF file :

AP6203A/L Series Anwell Semiconductor Corp. 300mA Linear Regulator with Enable and Fast Discharge Function Features General Description l AP6203A/L Without / With Fast Discharge l Operating Voltage Range：+2.2V to +7.0V l Output Voltages：+1.2V to +5.0V with 100mV l Maximum Output Current：300 mA l Dropout Voltage：120mV @ 100mA l Low Current Consumption 15µA (Typ.) l Shutdown Current：0.1µA (Typ.) l ±2% Output Voltage Accuracy (special ±1% highly accurate) l Low ESR Capacitor Compatible l High Ripple Rejection：70 dB l Output Current Limit Protection (450mA) l Short Circuit Protection (150mA) l Thermal Overload Shutdown Protection l Control Output ON/OFF Function l SOT-23-5 and UFN-6 Packages l RoHS Compliant and 100% Lead (Pb)-Free Applications The AP6203A/L is a 4-Low (L [ ... ]

AP6203A PDF Datasheet Download