This part is a kind of semiconductor called MC34063.
Function of this product has DC-DC CONVERTER CONTROL CIRCUITS.
Manufacturers : ST Microelectronics
Image and pinout :
Some of the text within the PDF file :
® MC34063A MC34063E DC-DC CONVERTER CONTROL CIRCUITS s s s s s s OUTPUT SWITCH CURRENT IN EXCESS OF 1.5A 2% REFERENCE ACCURACY LOW QUIESCENT CURRENT: 2.5mA (TYP.) OPERATING FROM 3V TO 40V FREQUENCY OPERATION TO 100KHz ACTIVE CURRENT LIMITING DIP-8 DESCRIPTION The MC34063A/E series is a monolithic control circuit delivering the main functions for DC-DC voltage converting. The device contains an internal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit, driver and high current output switch. Output voltage is adjustable through two external resistors with a 2% reference accuracy. Employing a minimum number of external components the MC34063A/E devices series is designed for Step-Down, Step-Up and Voltage-Inverting app [ ... ]