This part is a kind of semiconductor called MAP9000.

Function of this product has High Voltage AC LED Driver.

Manufacturers : MagnaChip

Image and pinout :

Some of the text within the PDF file :

MAP9000 – High Voltage AC LED Driver Confidential Datasheet Version 1.6 MAP9000 High Voltage AC LED Driver General Description The MAP9000 is LED Driver which has high input voltage ranged from 90V to 270V. It can drive several series LEDs from rectified AC voltage. The MAP9000 can achieve min 90% efficiency, 0.95 or higher power factor and low total harmonic distortion less than 20%. The MAP9000 has higher LED current drive capability up to 180mA and the current can be adjustable with external resistors. The MAP9000 is available in 6X6mm QFN 12Leads with Halogen-free (fully RoHS compliant). Features  Triac dimming (110Vac/120Vac only)  Flicker-free  EMI improvement  Power variation : ±15%  Current variation: ±6%  Higher power factor : > 0.95  Higher light eff [ ... ]

MAP9000 PDF Datasheet Download