This part is a kind of semiconductor called SM2082B.

Function of this product has Single Channel LED Constant Current Driver.

Manufacturers : Linkage

Image and pinout :

Some of the text within the PDF file :

GOSTON ELECTRONICS CO.,LTD SM2082B Single Channel LED Constant Current Driver v1.6 SM2082B Features  Patented constant current control technology  Output current adjustable with range 5mA~60mA  Inter-chip output current deviation <±4%  Over temperature protection  Sharing PCB board with LED lamps  Excellence EMI performance  Simple circuit and low cost  Package：ESOP8、TO252-2 General Description SM2082B is a single channel LED constant current driver which integrates patented constant current setting and control technology. The output current designed by external REXT is 5mA~60mA and it is invariant to OUT output voltage change, which has better constant current performance. It is a low cost circuit with simple circuit and less external components. Pin Figure [ ... ]

SM2082B PDF Datasheet Download