MC34063A MC33063A NCV33063A 1.5 A Step−Up/Down/ Inverting Switching Regulators

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I MC34063A, MC33063A, NCV33063A , OUTPUT SWITCH ON-OFF TIME ( s) t on−off μ 1000 500 200 100 50 20 10 5.0 2.0 1.0 V CC = 5.0 V Pin 7 = V CC Pin 5 = GND T A = 25°C 0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 C T , OSCILLATOR TIMING CAPACITOR (nF) t on t off , OSCILLATOR VOLTAGE (V) OSC V V CC = 5.0 V Pin 7 = V CC Pin 2 = GND Pins 1, 5, 8 = Open C T = 1.0 nF T A = 25°C 10 s/DIV 200 mV/DIV Figure 2. Output Switch On−Off Time versus Oscillator Timing Capacitor Figure 3. Timing Capacitor Waveform , SATURATION VOLTAGE (V) CE(sat) V 1.8 1.7 1.6 1.5 1.4 1.3 V CC = 5.0 V 1.2 Pins 1, 7, 8 = V CC Pins 3, 5 = GND 1.1 T A = 25°C (See Note 7) 1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 I E , EMITTER CURRENT (A) CE(sat), SATURATION VOLTAGE (V) V 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 V CC = 5.0 V Pin 7 = V CC Pins 2, 3, 5 = GND T A = 25°C (See Note 7) Darlington Connection Forced = 20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 I C , COLLECTOR CURRENT(A) Figure 4. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current Figure 5. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current , CURRENT LIMIT SENSE VOLTAGE (V) IPK(sense) V 400 380 3.2 V CC = 5.0 V 360 I chg = I dischg 2.8 340 2.4 320 2.0 300 280 1.6 260 1.2 C T = 1.0 nF 240 0.8 Pin 7 = V CC Pin 2 = GND 220 0.4 200 0 −55 −25 0 25 50 75 100 125 0 5.0 10 15 20 25 30 35 40 T A , AMBIENT TEMPERATURE (°C) V CC , SUPPLY VOLTAGE (V) CC, SUPPLY CURRENT (mA) 3.6 Figure 6. Current Limit Sense Voltage versus Temperature Figure 7. Standby Supply Current versus Supply Voltage 7. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. http://onsemi.com 4
MC34063A, MC33063A, NCV33063A 170 H L 8 180 S Q Q2 1 R Q1 7 2 1N5819 V in 12 V R sc 0.22 6 5 V CC + − I pk OSC Comp. C T 3 C T 1.25 V Ref Reg 1500 pF 4 R1 2.2 k R2 47 k + 100 Optional Filter 1.0 H V out 28 V/175 mA V out + + 330 C O 100 Test Conditions Results Line Regulation V in = 8.0 V to 16 V, I O = 175 mA 30 mV = ±0.05% Load Regulation V in = 12 V, I O = 75 mA to 175 mA 10 mV = ±0.017% Output Ripple V in = 12 V, I O = 175 mA 400 mVpp Efficiency V in = 12 V, I O = 175 mA 87.7% Output Ripple With Optional Filter V in = 12 V, I O = 175 mA 40 mVpp Figure 8. Step−Up Converter http://onsemi.com 5
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MC34063A MC33063A NCV33063A 1.5 A Step−Up/Down/ Inverting Switching Regulators

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