This part is a kind of semiconductor called BM1117.

Function of this product has Adjustable and fixed voltage regulators.

Manufacturers : Bookly Microelectronic

Image and pinout :

Some of the text within the PDF file :

BM1117 GENERAL DESCRIPTION The BM1117 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the reference voltage to within 1% accuray. Current limit is also trimmed, minimizing the stress under overload conditions on both the regulator and power source circuitry. The BM1117 devices are pin compatible with other three-terminal SCSI regulators and are offered in the low profile surface mount SOT-223 package and in the TO-252 (DPAK) plastic package. FEATURES Three Terminal Adjustable or Fixed Voltages* 1.5V, 1.8V, 2.5V, 2.85V, 3.3 [ ... ]

BM1117 PDF Datasheet Download