This part is a kind of semiconductor called FS1117.

Function of this product has 1A Low Dropout Positive Adjustable or Fixed-Mode Regulator.

Manufacturers : FASTSTAR SEMICONDUCTOR

Image and pinout :

Some of the text within the PDF file :

FS1117 1A Low Dropout Positive Adjustable or Fixed-Mode Regulator Features: 1.4V maximum dropout at full load current Fast transient response Output current limiting Built-in thermal shutdown Good noise rejection 3-Terminal Adjustable or Fixed 1.5V, 1.8V, 1.9V,2.5V, 3.3V, 5.0V 1 Adj(GND) 2 Vout 3 Vin Absolute Maximum Ratings Ta = 25 Parameter DC Supply Voltage Power Dissipation Thermal Resistance Junction-to-Ambient Thermal Resistance Junction-to-Case * Operating Junction Temperature Range Storage Temperature * Control Circuitry/Power Transistor Symbol Vin PD JA JC Rating -0.3 to 12 Internally Limited 300 100 0 to +150 -65 to +150 Unit V /W /W TOP TST Block Diagram FASTSTAR SEMICONDUCTOR ELECTRONICS CO.,LTD. 1/3 www.faststar.com.cn FS1117 1A Low Dropout Positive Adjustable or [ ... ]

FS1117 PDF Datasheet Download