This part is a kind of semiconductor called LD1117A.

Function of this product has 1A Low Dropout Positive Voltage Regulator.

Manufacturers : TAITRON

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Some of the text within the PDF file :

1 A Low Dropout Positive Voltage Regulator LD1117A 1A Low Dropout Positive Voltage Regulator General Description • LD1117A is a three terminal low dropout positive voltage regulator with a dropout of 1.15V at 1A output current. • LD1117A is available in an adjustable version which can set the output voltage 1.25V to 12V with only 2 external resisitors.In addition,it is also available in 7 Fixed output voltages: 1.2V,1.5V,1.8V,2.5V,2.85V,3.3V an 5.0V SOT-223 SOT-89 • LD1117A provides current limiting and thermal shutdown. Its circuit includes a trimmed Bandgap reference to assure output voltage accuracy to be within ±1.0% for fixed output voltage version and ±2.0% for adjustable output voltage version. Current limit is trimmed to ensure specified output current and controlled short [ ... ]

LD1117A PDF Datasheet Download