MC34063 LINEAR INTEGRATED CIRCUIT DC TO DC CONVERTER CONTROLLER DESCRIPTION The Contek MC34063 is a monolithic regulator subsystem, intended for use as DC to DC converter. This device contains a temperature compensated band gap reference, a duty-cycle control oscillator, driver and high current output switch. It can be used for step down, step-up or inverting switching regulators as well as for series pass regulators. SOP-8 FEATURES *Operation from 3.0V to 40V. *Short circuit current limiting. *Low standby current. *Output switch current of 1.5A without external transistors. *Frequency of operation from 100Hz to 100kHz. *Step-up, step-down or inverting switch regulators. DIP-8 PIN CONFIGURATION Switch Collector 1 8 Driver Collector Switch Emitter 2 7 Lpk Sense Timing Capacitor 3 6 Vcc Gnd 4 5 Comparator Inverting input Contek MC34063 BLOCK DIAGRAM E SWITCH COLLECTOR T2 1 S Q R T1 SWITCH EMITTER A 3 GND 4 DRIVE COLLECTOR 7 Ipeak SENSE D C 2 TIMING CAPACITOR 8 Is CT OSCILLATOR 6 Vcc COMP. 1.25Vref B 5 COMPARATOR INVERTING INPUT Contek Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 1 MC34063 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta=25 PARAMETER Supply Voltage Comparator input voltage range Switch collector voltage Switch Emitter Voltage Switch collector to emitter voltage Driver collector Voltage Switch current C) SYMBOL VALUE Vcc Vi(comp) Vc(sw) Ve(sw) Vce(sw) Vc(dr) Isw ELECTRICAL CHARACTERISTICS( Ta=25 (Vcc=5.0V,Ta=0~70 C,unless otherwise specified) UNIT 40 -0.3~+40 40 40 40 40 1.5 V V V V V V A C) PARAMETER SYMBOL TEST CONDITIONS MIN TYP. MAX UNIT Charging Current Discharging Current Oscillator Amplitude Discharge to Charge Current Ratio Current limit Sense Voltage Ichg Idischg Vosc K Vsense Vcc=5 to 40V,Ta=25 C Vcc=5 to 40V,Ta=25 C Ta=25 C V7=Vcc,Ta=25 C Ichg=Idischg Ta=25 C 22 140 31 190 0.5 6.1 300 42 260 mA mA V 7.5 350 mV Saturation Voltage 1(note) Vce(sat)1 0.95 1.3 V Saturation Voltage 2(note) Vce(sat)2 0.45 0.7 V C(off) Isw=1.0A Vc(driver)=Vc(sw) Isw=1.0A Vc(driver)=50mA Isw=1.0A Vce=5.0V,Ta=25 C Vce=40.0V,Ta=25 C 0.01 100 mA Vth Vth Ibias Vcc=3~40V Vi=0V 1.24 2.0 50 1.29 5.0 400 V mV nA 2.7 4.0 mA Oscillator Output Switch DC Current Gain(note) Collector Off State Current(note) Comparator Threshold Voltage Threshold voltage Line Regulation Input Bias Current Total Device Supply Current Gi(DC) Icc 5.2 250 50 1.21 Vcc=5~40V Ct=0.001 V7=Vcc Vc>Vth Pin2=GND 180 NOTE: Output switch tests are performed under pulsed conditions to minimize power dissipation. Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 2 MC34063 LINEAR INTEGRATED CIRCUIT Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 3 MC34063 LINEAR INTEGRATED CIRCUIT Contek Contek Contek Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 4 MC34063 LINEAR INTEGRATED CIRCUIT Contek Contek Contek Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 5 MC34063 LINEAR INTEGRATED CIRCUIT Contek Contek Contek Contek Microelectronics Co.,Ltd. CONTEK http://www.contek-ic.com E-mail:sales@contek-ic.com 6