MC33063A

MC34063A / MCC33063A— SMPS Controller June 2008 MC34063A / MC33063A SMPS Controller Features ƒ Operation from 3.0 to 40V Input ƒ Short Circuit Current Limiting ƒ Low Standby Current ƒ Output Switch Current of 1.5A Without External Transistors ƒ Adjustable Output Voltage ƒ Frequency of Operation from 100Hz to 100KHz ƒ Step-up, Step Down, or Inverting Switching Regulators Description The MC34063A/MC33063A is a monolithic regulator subsystem intended for a DC to DC converter. The device contains a temperature-compensated bandgap reference, a duty cycle control oscillator, driver, and high-current output switch. It can be used for stepdown, step-up, or inverting switching and series pass regulators. 8-DIP 8-SOP Ordering Information Part Number MC34063AP MC34063AD MC33063AP MC33063AD Operating Temperature Range 0 ~ +70°C 0 ~ +70°C -40 ~ +85°C -40 ~ +85°C Eco Status RoHS RoHS RoHS RoHS Package 8-DIP 8-SOP 8-DIP 8-SOP For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2001 Fairchild Semiconductor Corporation MC34063A/MC33063A Rev. 1.0.3 www.fairchildsemi.com MC34063A / MC33063A — SMPS Controller Block Diagram DRI VE SWITCH COLLECTOR COLLECTOR 81 1.25V REF VTG COMP 5 COMPARATOR I NV ERTING I NP UT S Q 4 GND IP K SENSE TIMIN G C APA CITOR 7 3 * VCC(6) OSCILLATOR R Figure 1. Block Diagram Q2 Q1 RD 2 © 2001 Fairchild Semiconductor Corporation MC34063A/MC33063A Rev. 1.0.3 2 www....