MC34063A / MCC33063A SMPS Controller June 2008 MC34063A / MC33063A SMPS Controller Features Description The MC34063A/MC33063A is a monolithic regulator Operation from 3.0 to 40V Input subsystem intended for a DC to DC converter. The Short Circuit Current Limiting device contains a temperature-compensated bandgap reference, a duty cycle control oscillator, driver, and Low Standby Current high-current output switch. It can be used for step- Output Switch Current of 1.5A Without External down, step-up, or inverting switching and series pass Transistors regulators. Adjustable Output Voltage 8-DIP Frequency of Operation from 100Hz to 100KHz Step-up, Step Down, or Inverting Switching Regulators 8-SOP Ordering Information Operating Part Number Package Eco Status Temperature Range MC34063AP 0 ~ +70C RoHS 8-DIP MC34063AD 0 ~ +70C RoHS 8-SOP MC33063AP -40 ~ +85C RoHS 8-DIP MC33063AD -40 ~ +85C RoHS 8-SOP For Fairchilds definition of green Eco Status, please visit: MC34063A / MC33063A SMPS Controller Block Diagram DRIVE SWITCH COLLECTOR COLLECTOR 8 1 1.25V COMP S REF 5 Q VTG Q2 COMPARATOR INVERTING INPUT Q1 4 RD I SENSE 7 PK GND R OSCILLATOR TIMING 3 CAPACITOR *V (6) 2 CC Figure 1. Block Diagram 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com MC34063A/MC33063A Rev. 1.0.3 2