This part is a kind of semiconductor called BA9741A.

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

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UTC BA9741A LINEAR INTEGRATED CIRCUIT TWO-CHANNEL SWITCHING REGULATOR CONTORLLER DESCRIPTION The UTC BA9741A 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. SOP-16 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. TSSOP-16 APPLICATION *DC/DC converters for video cameras and notebook computers etc. DIP-16 PIN CONFIGURATIONS CT RT 1 2 16 15 VREF SCP ERROR AMPLIFIER 2 NON1 3 ERROR AMPLI [ ... ]

BA9741A PDF Datasheet Download