Integrate Circuit SMD Type 1.2 A, Step-Up/Down/Inverting Switching Regulators MC34063 Features Low Standby Current Current Limiting Output Switch Current to 1.2 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference Absolute Maximum Ratings Ta = 25 Parameter Power Supply Voltage Symbol Rating Unit VCC 40 V VIR -0.3 to +40 V Switch Collector Voltage VC(switch) 40 V Switch Emitter Voltage (VPin 1 = 40 V) VE(switch) 40 V Switch Collector to Emitter Voltage Comparator Input Voltage Range VCE(switch) 40 V Driver Collector Voltage VC(driver) 40 V Driver Collector Current * IC(driver) 100 mA ISW 1.2 A PD 625 mW /W Switch Current Power Dissipation and Thermal Characteristics TA = 25 RèJA 160 Operating Junction Temperature TJ 150 Operating Ambient Temperature Range TA 0 to +70 Storage Temperature Range Tstg -65 to +150 Thermal Resistance * Maximum package power dissipation limits must be observed. www.kexin.com.cn 1 Integrate Circuit SMD Type MC34063 Electrical Characteristics Ta = 25 Parameter Symbol Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage Testconditons Unit 24 33 42 kHz Ichg VCC = 5.0 V to 40 V, TA = 25 24 35 42 A Idischg VCC = 5.0 V to 40 V, TA = 25 140 220 260 A Idischg/Ichg Pin 7 to VCC, TA = 25 5.2 6.5 7.5 Vipk(sense) 250 300 350 mV 1.0 1.3 V 0.45 0.7 V Ichg = Idischg, TA = 25 ISW =0.8 A, Pins 1, 8 connected Saturation Voltage (Forced â VCE(sat) ISW =0.8A, RPin 8 = 82 Collector Off-State Current Max VPin 5 = 0 V, CT = 1.0 nF, TA = 25 VCE(sat) 20) Typ fosc Saturation Voltage, Darlington Connection DC Current Gain Min hFE IC(off) to VCC, ISW =0.8 A, VCE = 5.0 V, TA = 25 50 VCE = 40 V 75 0.01 100 1.25 1.275 A Threshold Voltage Vth TA = 25 TA =0 1.21 to 70 Threshold Voltage Line Regulation Input Bias Current Supply Current VPin 5 > Vth, Pin 2 = GND, remaining pins open 2 1.225 www.kexin.com.cn Regline IIB ICC V 1.29 VCC = 3.0 V to 40 V 1.4 5.0 mV Vin = 0 V -20 -400 nA 4.0 mA VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,