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| UTC MC34063A LINEAR INTEGRATED CIRCUIT DC TO DC CONVERTER CONTROLLER DESCRIPTION The UTC MC34063A 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 Switch Emitter Timing Capacitor 1 8 Driver Collector 2 7 Lpk Sense 3 6 Vcc Gnd 4 5 Comparator Inverting input BLOCK DIAGRAM E SWITCH COLLECTOR T2 S Q R T1 SWITCH EMITTER D C Is A TIMING CAPACITOR CT OSCILLATOR 1 8 DRIVE COLLECTOR 2 7 Ipeak SENSE 3 6 Vcc COMP. GND 4 1.25Vref B 5 COMPARATOR INVERTING INPUT UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-008,A UTC MC34063A LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS(Ta=25C ) PARAMETER Supply Voltage Comparator input voltage range Switch collector voltage Switch Emitter Voltage Switch collector to emitter voltage Driver collector Voltage Switch current SYMBOL Vcc Vi(comp) Vc(sw) Ve(sw) Vce(sw) Vc(dr) Isw VALUE 40 -0.3~+40 40 40 40 40 1.5 UNIT V V V V V V A ELECTRICAL CHARACTERISTICS( Ta=25C ) (Vcc=5.0V,Ta=0~70C,unless otherwise specified) PARAMETER SYMBOL Ichg Idischg Vosc K Vsense TEST CONDITIONS Vcc=5 to 40V,Ta=25C Vcc=5 to 40V,Ta=25C Ta=25C V7=Vcc,Ta=25C Ichg=Idischg Ta=25C Isw=1.0A Vc(driver)=Vc(sw) Isw=1.0A Vc(driver)=50mA Isw=1.0A Vce=5.0V,Ta=25C Vce=40.0V,Ta=25C MIN 22 140 5.2 250 TYP. 31 190 0.5 6.1 300 MAX 42 260 7.5 350 UNIT A A V mV Oscillator Charging Current Discharging Current Oscillator Amplitude Discharge to Charge Current Ratio Current limit Sense Voltage Output Switch Saturation Voltage 1(note) Saturation Voltage 2(note) DC Current Gain(note) Collector Off State Current(note) Vce(sat)1 Vce(sat)2 Gi(DC) C(off) Vth Vth Ibias 0.95 0.45 50 180 0.01 1.21 Vcc=3~40V Vi=0V Vcc=5~40V Ct=0.001 V7=Vcc Vc>Vth Pin2=GND 1.24 2.0 50 100 1.29 5.0 400 A V mV nA 1.3 0.7 V V Comparator Threshold Voltage Threshold voltage Line Regulation Input Bias Current Total Device Supply Current Icc 2.7 4.0 mA NOTE: Output switch tests are performed under pulsed conditions to minimize power dissipation. UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-008,A UTC MC34063A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-008,A UTC MC34063A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-008,A UTC MC34063A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-008,A UTC MC34063A LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R103-008,A |
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