MC34063A ST662A MC34063ACN MC34063ACD MC34063ACD-TR

A VERSATILE SOLUTION FOR SWITCHING POWER SUPPLY REGULATION A s a recognised leader for Standard Linear Voltage Regulators the STD

MC34063A MC34063A A VERSATILE SOLUTION FOR SWITCHING POWER SUPPLY REGULATION A s a recognised leader for Standard Linear Voltage Regulators the STD ICs group is continually developing new and more sophisticated products. The initial step was the introduction of six new families of low drop, low power linear regulators with inhibit control. These have now been followed by two switching regulators: ST662A ST662A a charge pump MC34063A MC34063A a PWM controller MONOLITHIC CONTROL CIRCUIT The MC34063A MC34063A is a monolithic control circuit delivering the main function for DC-DC voltage converting. Employing a minimum number of external components, the device is able to work as a step-down, step-up or inverting voltage converter. The MC34063A MC34063A is one of the most popular DC-DC converters available and offers the well known benefits for this kind of switching solution. Unlike its linear counterparts the device is able: to pass from a much higher input voltage to a regulated adjustable output voltage, while dissipating only a small amount of power; to convert a positive input voltage into an adjustable higher voltage or even into an adjustable negative one. This depends on the different configuration of the external components. ORDER CODES MC34063ACN MC34063ACN MC34063ACD MC34063ACD MC34063ACD-TR MC34063ACD-TR DIP-8 SO-8 SO-8 Tape & Reel Drive Collector 8 S Q 1 Switch Collector Q2 Q1 R 2 Switch Emitter Ipk Sense 7 Ipk Oscillator Vcc 6 Comparator Inverting 5 Input Comparator 1.25V Reference Regulator 3 Timing Capacitor 4 GND MC34063A MC34063A block diagram MAIN FEATURES Output switch current in excess of 1.5A Adjustable output 2% reference tolerance Operating from 3V to 40V Low quiescent current: 2.5mA (TYP) Frequency operating up to 100KHz Active current limiting L 170µH Rsc R3 8 0.33 DRC SWC DRC SWC 1 7 IPK SWE 2 6 Vcc TC 3 CII GND 180 7 IPK SWE 2 6 Vcc TC 3 25V Vin Ci 100µF 8 1 Ct + 5 Rsc 470pF GND CII L 220µH 4 1.2K 5 3.6K 4 Vout + Ci 100µF R2 Ct 28V/175mA 12V Vin MC34063A MC34063A R1 1.5nF 0.22 MC34063A MC34063A 5.0V/0.5A Vout + Co 470µF R1 R2 2.2K 47K Step down converter + Step up converter 8 1 SWC 8 DRC SWC IPK SWE 2 Vcc TC 3 CII GND L 90µH 4.5 to 6.0V 6 Vin Ci 100µF Ct R2 8.2K GND CII Pin configuration 4 MC34063A MC34063A R1 Vcc 1.5nF + 5 IPK TC 1 7 0.22 DRC SWE Rsc 953 -12V/100mA Vout Inverting converter + Co 1000µF Co 330µF