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MC34063A, MC33063A, NCV33063A 1.5 A, Step−Up/Down/ Inverting Switching Regulators The MC34063A Series is a monolithic control circuit containing the primary functions required for DC−to−DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in Step−Down and Step−Up and Voltage−Inverting applications with a minimum number of external components. Refer to Application Notes AN920A/D and AN954/D for additional design information. Features • Operation from 3.0 V to 40 V Input • Low Standby Current • Current Limiting • Output Switch Current to 1.5 A • Output Voltage Adjustable • Frequency Operation to 100 kHz • Precision 2% Reference • Pb−Free Packages are Available 8 7 6 5 Drive Collector Ipk Sense VCC Comparator Inverting Input 1 2 3 4 Switch Collector Switch Emitter Timing Capacitor GND S Q R Q2 Q1 100 Ipk Oscillator CT Comparator + − 1.25 V Reference Regulator (Bottom View) This device contains 51 active transistors. Figure 1. Representative Schematic Diagram http://onsemi.com SOIC−8 D SUFFIX CASE 751 8 1 PDIP−8 P, P1 SUFFIX CASE 626 8 1 MARKING DIAGRAMS 8 1 3x063 ALYWA G 8 1 8 1 3x063AP1 AWL YYWWG 33063AVP AWL YYWWG = 3 or 4 = Assembly Location = Wafer Lot = Year x A L, WL Y, YY W, WW = Work Week G or G = Pb−Free Package PIN CONNECTIONS Switch Collector Switch Emitter Timing Capacitor GND 1 2 3 4 8 7 6 5 Driver Collector Ipk Sense VCC Comparator Inverting Input (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet. © Semiconductor Components Industries, LLC, 2007 February, 2007 − Rev. 19 1 Publication Order Number: MC34063A/D

MC34063A, MC33063A, NCV33063A MAXIMUM RATINGS Rating Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPin 1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Power Dissipation and Thermal Characteristics Plastic Package, P, P1 Suffix TA = 25°C Thermal Resistance SOIC Package, D Suffix TA = 25°C Thermal Resistance Operating Junction Temperature Operating Ambient Temperature Range MC34063A MC33063AV, NCV33063A MC33063A Storage Temperature Range Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW PD RqJA PD RqJA TJ TA Tstg Value 40 −0.3 to + 40 40 40 40 40 100 1.5 1.25 100 625 160 +150 0 to +70 −40 to +125 −40 to + 85 −65 to +150 Unit Vdc Vdc Vdc Vdc Vdc Vdc mA A W °C/W mW °C/W °C °C °C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. Maximum package power dissipation limits must be observed. 2. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per MIL−STD−883, Method 3015. Machine Model Method 400 V. 3. NCV prefix is for automotive and other applications requiring site and change control. http://onsemi.com 2

MC34063A, MC33063A, NCV33063A ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 4], unless otherwise specified.) Characteristics Symbol Min Typ Max Unit OSCILLATOR Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C) Charge Current (VCC = 5.0 V to 40 V, TA = 25°C) Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C) Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C) Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C) OUTPUT SWITCH (Note 5) Saturation Voltage, Darlington Connection ( ISW = 1.0 A, Pins 1, 8 connected) Saturation Voltage (Note 6) (ISW = 1.0 A, RPin 8 = 82 W to VCC, Forced b ] 20) DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C) Collector Off−State Current (VCE = 40 V) COMPARATOR Threshold Voltage TA = 25°C TA = Tlow to Thigh Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) MC33063A, MC34063A MC33063AV, NCV33063A Input Bias Current (Vin = 0 V) TOTAL DEVICE Supply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC, VPin 5 > Vth, Pin 2 = GND, remaining pins open) fosc Ichg Idischg Idischg/Ichg Vipk(sense) VCE(sat) VCE(sat) hFE IC(off) Vth Regline IIB ICC 24 24 140 5.2 250 − − 50 − 33 35 220 6.5 300 42 42 260 7.5 350 1.0 1.3 0.45 0.7 75 0.01 − 100 1.225 1.21 1.25 − 1.275 1.29 kHz mA mA − mV V V − mA V mV − − − − 1.4 1.4 5.0 6.0 −20 −400 nA − 4.0 mA 4. Tlow = 0°C for MC34063A, − 40°C for MC33063A, AV, NCV33063A 5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 6. Thigh = +70°C for MC34063A, + 85°C for MC33063A, +125°C for MC33063AV, NCV33063A If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents (≥ 30 mA), it may take up to 2.0 ms for it to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non−Darlington configuration is used, the following output drive condition is recommended: Forced b of output switch : IC output IC driver – 7.0 mA * w 10 * The 100 W resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts. http://onsemi.com 3

MC34063A, MC33063A, NCV33063A VCC = 5.0 V Pin 7 = VCC Pin 5 = GND TA = 25°C 1000 500 200 100 50 20 10 5.0 2.0 1.0 ton toff 0.01 0.02 0.1 0.05 2.0 CT, OSCILLATOR TIMING CAPACITOR (nF) 0.5 1.0 0.2 ) V ( E G A T L O V R O T A L L C S O I , C S O V VCC = 5.0 V Pin 7 = VCC Pin 2 = GND Pins 1, 5, 8 = Open CT = 1.0 nF TA = 25°C 5.0 10 10 ms/DIV I / V D V m 0 0 2 Figure 2. Output Switch On−Off Time versus Figure 3. Timing Capacitor Waveform Oscillator Timing Capacitor ) V ( E G A T L O V N O T A R U T A S I , ) t a s ( E C V 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 VCC = 5.0 V Pin 7 = VCC Pins 2, 3, 5 = GND TA = 25°C (See Note 7) Darlington Connection Forced b = 20 VCC = 5.0 V Pins 1, 7, 8 = VCC Pins 3, 5 = GND TA = 25°C (See Note 7) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 IE, EMITTER CURRENT (A) IC, 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 VCC = 5.0 V Ichg = Idischg 3.6 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 ) A m ( T N E R R U C Y L P P U S , C C I 100 125 0 0 I - ) s μ ( E M T F F O N O H C T W S T U P T U O I , f f o − n o t ) V ( E G A T L O V N O T A R U T A S I , ) t a s ( E C V ) V ( E G A T L O V E S N E S T M I L T N E R R U C I , ) e s n e s ( K P V I 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 400 380 360 340 320 300 280 260 240 220 200 −55 −25 0 75 TA, AMBIENT TEMPERATURE (°C) 50 25 Figure 6. Current Limit Sense Voltage versus Temperature CT = 1.0 nF Pin 7 = VCC Pin 2 = GND 5.0 10 15 20 25 30 35 40 VCC, SUPPLY VOLTAGE (V) 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 mH L S Q Q2 R Q1 Ipk CT OSC VCC + − Comp. 1.25 V Ref Reg 1N5819 1 2 3 CT 1500 pF 4 180 Rsc 0.22 Vin 12 V + 100 8 7 6 5 R2 47 k R1 2.2 k Vout 28 V/175 mA 330 + CO 1.0 mH Vout + 100 Optional Filter Test Conditions Line Regulation Load Regulation Output Ripple Efficiency Output Ripple With Optional Filter Vin = 8.0 V to 16 V, IO = 175 mA Vin = 12 V, IO = 75 mA to 175 mA Vin = 12 V, IO = 175 mA Vin = 12 V, IO = 175 mA Vin = 12 V, IO = 175 mA Results 30 mV = ±0.05% 10 mV = ±0.017% 400 mVpp 87.7% 40 mVpp Figure 8. Step−Up Converter http://onsemi.com 5

MC34063A, MC33063A, NCV33063A 8 7 6 Rsc Vin 1 2 Vout 8 7 6 Rsc Vin R Vout 1 2 R ³ 0 for constant Vin Figure 9. External Current Boost Connections for IC Peak Greater than 1.5 A 9a. External NPN Switch 9b. External NPN Saturated Switch (See Note 8) 8. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents (≥ 30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non−Darlington configuration is used, the following output drive condition is recommended. http://onsemi.com 6

MC34063A, MC33063A, NCV33063A 8 7 6 5 Rsc 0.33 Vin 25 V + 100 S Q R Q2 Q1 1 2 Ipk CT OSC VCC + − Comp. 1.25 V Ref Reg 220 mH 1N5819 3 CT L 470 pF 4 R2 3.6 k R1 1.2 k 1.0 mH Vout 5.0 V/500 mA Vout + 100 470 + CO Test Conditions Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Vin = 15 V to 25 V, IO = 500 mA Vin = 25 V, IO = 50 mA to 500 mA Vin = 25 V, IO = 500 mA Vin = 25 V, RL = 0.1 W Vin = 25 V, IO = 500 mA Vin = 25 V, IO = 500 mA Figure 10. Step−Down Converter Optional Filter Results 12 mV = ±0.12% 3.0 mV = ±0.03% 120 mVpp 1.1 A 83.7% 40 mVpp 8 7 6 Rsc Vin 1 2 8 7 6 Vout Rsc Vin V 1 2 Figure 11. External Current Boost Connections for IC Peak Greater than 1.5 A 11a. External NPN Switch 11b. External PNP Saturated Switch http://onsemi.com 7

MC34063A, MC33063A, NCV33063A 8 7 6 5 S Q Q2 R Q1 Ipk CT OSC VCC + − Comp. 1.25 V Ref Reg 1 2 3 4 L + 88 mH 1500 pF 1N5819 Rsc 0.24 Vin 4.5 V to 6.0 V + 100 R1 953 R2 8.2 k Vout −12 V/100 mA 1000 mf CO + 1.0 mH Vout 100 + Optional Filter Test Conditions Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Vin = 4.5 V to 6.0 V, IO = 100 mA Vin = 5.0 V, IO = 10 mA to 100 mA Vin = 5.0 V, IO = 100 mA Vin = 5.0 V, RL = 0.1 W Vin = 5.0 V, IO = 100 mA Vin = 5.0 V, IO = 100 mA Results 3.0 mV = ± 0.012% 0.022 V = ± 0.09% 500 mVpp 910 mA 62.2% 70 mVpp Figure 12. Voltage Inverting Converter 8 7 6 Vin 1 2 3 4 + 8 7 6 Vout Vin Vout 1 2 3 + 4 Figure 13. External Current Boost Connections for IC Peak Greater than 1.5 A 13a. External NPN Switch 13b. External PNP Saturated Switch http://onsemi.com 8

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