MC34063A

UNISONIC TECHNOLOGIES CO., LTD MC34063A 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. LINEAR INTEGRATED CIRCUIT 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. Lead-free: MC34063AL Halogen-free: MC34063AG ORDERING INFORMATION Normal MC34063A-D08-T MC34063A-S08-R Ordering Number Lead Free MC34063AL-D08-T MC34063AL-S08-R Halogen Free MC34063AG-D08-T MC34063AG-S08-R Package DIP-8 SOP-8 Packing Tube Tape Reel www.unisonic.com.tw Copyright © 2008 Unisonic Technologies Co., Ltd 1 of 10 QW-R103-008,H MC34063A PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION PIN NO 1 2 3 4 5 6 7 8 PIN NAME Switch Collector Switch Emitter Timing Capacitor GND Comparator Inverting Input VCC IPEAK Sense Driver Collector I/O I O DESCRIPTION Internal Darlington pairs TI collector Internal Darlington pairs TI emitter The value of selected capacitor controls the internal oscillator run rate Inverting input of comparator which can set & initiate the Darlington pairs output switch Current sense input to monitor the voltage drop across an external resistor placed in series with VCC Internal Darlington pairs TI collector I I I UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 10 QW-R103-008,H MC34063A BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT E Switch Collector 1 T1 Switch Emitter 2 A Timing Capacitor 3 COMP. T2 Q S R D C Is 8 Drive Collector 7 IPEAK Sense CT OSCILLATOR 6 Vcc GND 4 1.25VREF B 5 Comparator Inverting Input UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 10 QW-R103-008,H MC34063A ABSOLUTE MAXIMUM RATINGS (Ta=25°C ) PARAMETER Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage Switch Collector to Emitter Voltage Driver Collector Voltage Switch Current LINEAR INTEGRATED CIRCUIT RATINGS UNIT 40 V -0.3 ~ +40 V 40 V 40 V 40 V 40 V 1.5 A DIP-8 1250 Power Dissipation (Ta=25°C) PD mW SOP-8 625 Junction Temperature TJ +150 °C Operating Temperature TOPR 0 ~ +70 °C Storage Temperature TSTG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. SYMBOL VCC VIN(COMP) VC(SW) VE(SW) VCE(SW) VC(DR) ISW THERMAL DATA PARAMETER Junction-to-Ambient DIP-8 SOP-8 SYMBOL θJA RATINGS 100 160 UNIT ℃/W ELECTRICAL CHARACTERISTICS (VCC=5.0V, Ta=0~+70°C, unless otherwise specified.) PARAMETER 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) Comparator Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Total Device Supply Current SYMBOL ICHG IDISCHG VOSC K VSENSE VCE(SAT)1 VCE(SAT)2 GI (DC) IC(OFF) VTHD VTHD II(BIAS) ICC TEST CONDITIONS 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 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 MIN 22 140 5.2 250 TYP MAX UNIT 31 190 0.5 6.1 300 0.95 0.45 180 0.01 42 260 7.5 350 1.3 0.7 100 μA μA V mV V V μA V mV nA mA 50 VCC=3 ~ 40V VIN=0V 1.21 1.24 1.29 2.0 5.0 50 400 2.7 4.0 VCC=5~40V, CT=0.001 V7=VCC, VC>VTHD, Pin2=GND Note: Output switch tests are performed under pulsed conditions to minimize power dissipation. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 10 QW-R103-008,H MC34063A STEP-UP CONVERTER 170μH L 8 180 SQ R 7 IPK RSC 0.22 VIN12V 6 + 100 VCC + - Comp. 5 R2 R1 2.2k 47k 330 1.25V REF REG OSC CT 3 CT 1500pF 4 Q2 Q1 2 1 LINEAR INTEGRATED CIRCUIT 1N5819 1.0μH + CO VOUT 28V/175mA VOUT + 100 Optional Filter Test Line Regulation Load Regulation Output Ripple Efficiency Output Ripple With Optional Filter Conditions VIN = 8.0V ~ 16V, IOUT = 175mA VIN = 12V, IOUT = 75mA ~ 175mA VIN = 12V, IOUT = 175mA VIN = 12V, IOUT = 175mA VIN = 12V, IOUT = 175mA Results 30mV = ±0.05% 10mV = ±0.017% 400mVp-p 87.7% 40mVp-p UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 10 QW-R103-008,H MC34063A STEP-DOWN CONVERTER(Cont.) LINEAR INTEGRATED CIRCUIT Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Conditions VIN = 15V ~ 25V, IOUT = 500mA VIN = 25V, IOUT = 50mA ~ 500mA VIN = 25V, IOUT = 500mA VIN = 25V, RL = 0.1Ω VIN = 25V, IOUT = 500mA VIN = 25V, IOUT = 500mA Results 12mV = ±0.12% 3.0mV = ±0.03% 120mVp-p 1.1A 83.7% 40mVp-p UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 10 QW-R103-008,H MC34063A VOLTAGE INVERTING CONVERTER LINEAR INTEGRATED CIRCUIT Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Conditions VIN = 4.5V ~ 6.0V, IOUT = 100mA VIN = 5.0V, IOUT = 10mA ~ 100mA VIN = 5.0V, IOUT = 100mA VIN = 5.0V, RL = 0.1Ω VIN = 5.0V, IOUT = 100mA VIN = 5.0V, IOUT = 100mA Results 3.0mV = ±0.012% 0.022V = ±0.09% 500mVp-p 910mA 62.2% 70mVp-p UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 10 QW-R103-008,H MC34063A LINEAR INTEGRATED CIRCUIT EXTERNAL CURRENT BOOST CONNECTIONS FOR IC PEAK GREATER THAN 1.5A UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 10 QW-R103-008,H MC34063A TYPICAL CHARACTERISTICS LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 10 QW-R103-008,H MC34063A DESIGN FORMULA TABLE CALCULATION tON tOFF (tON+tOFF)MAX CT 4x10-5 tON 2IOUT(MAX) 0.3/ISW STEP-DOWN LINEAR INTEGRATED CIRCUIT STEP-UP VOLTAGE-INVERTING VOUT + VF VIN - VCE(SAT) 4x10-5 tON 4x10-5 tON ISW RS L(MIN) CO 0.3/ISW 0.3/ISW IOUT tON VRIPPLE(P-P) VCE(SAT) - Saturation voltage of the output switch. VF - Forward voltage drop of the ringback rectifier. The following power supply characteristics must be chosen: - Nominal input voltage. VIN VOUT - Desired output voltage, VOUT =1.25(1+R2/R1) - Desired output current. IOUT FMIN - Minimum desired output switching frequency at the selected values for VIN and IOUT. VRIPPLE(P-P) - Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. U TC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 10 QW-R103-008,H