This part is a kind of semiconductor called BD6581GU.

Function of this product has 6-Channel White LED Driver.

Manufacturers : Rohm

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Datasheet 6-Channel White LED Driver for up to 72 LEDs BD6581GU General Description BD6581GU is white LED driver IC with PWM step-up DC/DC converter that can boost max 42.5V and current driver that can drive max 25mA. The wide and precision brightness can be controlled by external PWM pulse. BD6581GU has very accurate current drivers, and it has few current errors between each strings. So, it will be helpful to reduce brightness spots on the LCD. Small package type is suited for saving space. Features  High efficiency PWM step-up DC/DC converter (fsw=1MHz), max efficiency 93%  High accuracy & good matching ( 1.5%) current drivers 6ch  Drive up to 12 in series, 6 strings in parallel =72 white LEDs ( white LED Vf=3.5Vmax)  Rich safety functions Over-voltage protection (OVP) Over [ ... ]

BD6581GU PDF Datasheet Download