This part is a kind of semiconductor called BA9741.

Function of this product has TWO-CHANNEL SWITCHING REGULATOR CONTORLLER.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD BA9741 LINEAR INTEGRATED CIRCUIT TWO-CHANNEL SWITCHING REGULATOR CONTORLLER  DESCRIPTION The UTC BA9741 is a two-channel switching regulator controllers that use the PWM method. It can be used for DC to DC conversion for step-up, step-down, and inverting. The IC comes in a compact package, making it ideal for use in portable equipment.  FEATURES *High-accuracy reference voltage circuit (±1%) *Time-latch, short-circuit protection circuit *Miss-operation prevention circuit for low-voltage input *Reference voltage with output (2.5V) *Rest period adjustment is possible over the entire duty *range  ORDERING INFORMATION Ordering Number Lead Free Halogen Free BA9741L-D16-T BA9741G-D16-T - BA9741G-S16-R - BA9741G-P16-R Package DIP-16 SOP-16 TSS [ ... ]

BA9741 PDF Datasheet Download