MC34063A, MC33063A DC-to-DC Converter Control Circuits 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. • • • • • • • 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 http://onsemi.com PDIP–8 P, P1 SUFFIX CASE 626 8 1 8 1 8 1 SO–8 D SUFFIX CASE 751 SOEIAJ–8 M SUFFIX CASE 968 PIN CONNECTIONS Representative Schematic Diagram 1 Drive 8 Collector Q2 S Q R Ipk 7 Sense 100 6 2 3 Comparator + - Comparator 5 Inverting Input 1 8 Driver Collector Switch Emitter 2 7 Ipk Sense Timing Capacitor 3 6 VCC Gnd 4 5 Comparator Inverting Input (Top View) Q1 Ipk Oscillator CT VCC Switch Collector Switch Collector 1.25 V Reference Regulator Switch Emitter ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet. Timing Capacitor DEVICE MARKING INFORMATION See general marking information in the device marking section on page 11 of this data sheet. 4 Gnd (Bottom View) This device contains 51 active transistors. Semiconductor Components Industries, LLC, 2000 August, 2000 – Rev. 6 1 Publication Order Number: MC34063A/D MC34063A, MC33063A MAXIMUM RATINGS Symbol Value Unit Power Supply Voltage Rating VCC 40 Vdc Comparator Input Voltage Range VIR –0.3 to +40 Vdc Switch Collector Voltage VC(switch) 40 Vdc Switch Emitter Voltage (VPin 1 = 40 V) VE(switch) 40 Vdc Switch Collector to Emitter Voltage VCE(switch) 40 Vdc Driver Collector Voltage VC(driver) 40 Vdc Driver Collector Current (Note 1.) IC(driver) 100 mA ISW 1.5 A PD RθJA 1.25 100 W °C/W PD RθJA 625 160 W °C/W Operating Junction Temperature TJ +150 °C Operating Ambient Temperature Range MC34063A MC33063AV MC33063A TA Storage Temperature Range Tstg 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 °C 0 to +70 –40 to +125 –40 to +85 1. Maximum package power dissipation limits must be observed. 2. ESD data available upon request. http://onsemi.com 2 –65 to +150 °C MC34063A, MC33063A ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 3.], unless otherwise specified.) Characteristics Symbol Min Typ Max Unit fosc 24 33 42 kHz OSCILLATOR Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C) Ichg 24 35 42 µA Idischg 140 220 260 µA Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C) Idischg/Ichg 5.2 6.5 7.5 – Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C) Vipk(sense) 250 300 350 mV Saturation Voltage, Darlington Connection ( ISW = 1.0 A, Pins 1, 8 connected) VCE(sat) – 1.0 1.3 V Saturation Voltage (Note 5.) (ISW = 1.0 A, RPin 8 = 82 Ω to VCC, Forced β 20) VCE(sat) – 0.45 0.7 V hFE 50 75 – – IC(off) – 0.01 100 µA 1.225 1.21 1.25 – 1.275 1.29 – – 1.4 1.4 5.0 6.0 IIB – –20 –400 nA ICC – – 4.0 mA Charge Current (VCC = 5.0 V to 40 V, TA = 25°C) Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C) OUTPUT SWITCH (Note 4.) 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 Vth Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) MC33063A, MC34063A MC33363AV V Regline Input Bias Current (Vin = 0 V) mV 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) 3. Tlow = 0°C for MC34063A, –40°C for MC33063A, AV Thigh = +70°C for MC34063A, +85°C for MC33063A, +125°C for MC33063AV 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 5. 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 µs 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: IC output Forced of output switch : 10 IC driver – 7.0 mA * * The 100 Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts. http://onsemi.com 3 1000 VCC = 5.0 V Pin 7 = VCC Pin 5 = Gnd TA = 25°C 200 100 50 ton 20 10 5.0 toff 2.0 1.0 0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 CT, OSCILLATOR TIMING CAPACITOR (nF) 200 mV/DIV 500 V OSC, OSCILLATOR VOLTAGE (V) t on-off , OUTPUT SWITCH ONOFF TIME ( µs) MC34063A, MC33063A 5.0 10 10 µs/DIV Figure 1. Output Switch On–Off Time versus Oscillator Timing Capacitor Figure 2. Timing Capacitor Waveform VCE(sat), SATURATION VOLTAGE (V) VCE(sat), SATURATION VOLTAGE (V) 1.8 1.7 1.6 1.5 1.4 1.3 VCC = 5.0 V Pins 1, 7, 8 = VCC Pins 3, 5 = Gnd TA = 25°C (See Note 6.) 1.2 1.1 1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 IE, EMITTER CURRENT (A) 1.4 1.6 1.1 1.0 0.9 0.7 0.6 0.4 0.3 0.2 0.1 0 0.2 0.4 0.6 0.8 1.0 1.2 IC, COLLECTOR CURRENT(A) 1.4 1.6 3.2 VCC = 5.0 V Ichg = Idischg I CC, SUPPLY CURRENT (mA) VIPK(sense), CURRENT LIMIT SENSE VOLTAGE (V) 0 Forced β = 20 3.6 320 300 280 260 240 220 200 -55 VCC = 5.0 V Pin 7 = VCC Pins 2, 3, 5 = Gnd TA = 25°C (See Note 6.) 0.5 Figure 4. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current 400 360 340 Darlington Connection 0.8 Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current 380 Pins 1, 5, 8 = Open CT = 1.0 nF TA = 25°C VCC = 5.0 V Pin 7 = VCC Pin 2 = Gnd -25 0 25 50 75 TA, AMBIENT TEMPERATURE (°C) 100 2.8 2.4 2.0 1.6 1.2 0.4 0 125 CT = 1.0 nF Pin 7 = VCC Pin 2 = Gnd 0.8 0 Figure 5. Current Limit Sense Voltage versus Temperature 5.0 10 15 20 25 30 VCC, SUPPLY VOLTAGE (V) 35 Figure 6. Standby Supply Current versus Supply Voltage 6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. http://onsemi.com 4 40 MC34063A, MC33063A 170 µH L 1 8 180 S Q Q2 R Q1 7 2 Ipk Rsc 0.22 Vin 12 V Osc + 6 CT 3 CT VCC 100 + - Comp. 1N5819 1.25 V Ref Reg 5 4 1500 pF R2 R1 47 k 2.2 k 330 + 1.0 µH Vout 28 V/175 mA + CO Vout 100 Optional Filter Test Conditions Results Line Regulation Vin = 8.0 V to 16 V, IO = 175 mA 30 mV = ±0.05% Load Regulation Vin = 12 V, IO = 75 mA to 175 mA 10 mV = ±0.017% Output Ripple Vin = 12 V, IO = 175 mA 400 mVpp Efficiency Vin = 12 V, IO = 175 mA 87.7% Output Ripple With Optional Filter Vin = 12 V, IO = 175 mA 40 mVpp Figure 7. Step–Up Converter http://onsemi.com 5 MC34063A, MC33063A 8 1 7 Vout 8 7 2 Rsc Vin 1 R Vout 2 Rsc Vin 6 6 R 0 for constant Vin Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A 8a. External NPN Switch 8b. External NPN Saturated Switch (See Note 7.) 7. 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 µs 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 8 1 S Q Q2 Q1 R 7 2 Ipk Rsc 0.33 Vin 25 V Osc 6 100 + CT 1N5819 3 L CT VCC + - 1.25 V Ref Reg Comp. 5 4 220 µH 470 pF R1 3.6 k 1.2 k 470 + 1.0 µH Vout 5.0 V/500 mA R2 + CO Vout 100 Optional Filter Test Conditions Results Line Regulation Vin = 15 V to 25 V, IO = 500 mA 12 mV = ±0.12% Load Regulation Vin = 25 V, IO = 50 mA to 500 mA 3.0 mV = ±0.03% Output Ripple Vin = 25 V, IO = 500 mA 120 mVpp Short Circuit Current Vin = 25 V, RL = 0.1 Ω 1.1 A Efficiency Vin = 25 V, IO = 500 mA 83.7% Output Ripple With Optional Filter Vin = 25 V, IO = 500 mA 40 mVpp Figure 9. Step–Down Converter 8 1 7 2 7 Vout Rsc Vin 1 8 2 Rsc 6 Vin 6 Figure 10. External Current Boost Connections for IC Peak Greater than 1.5 A 10a. External NPN Switch 10b. External PNP Saturated Switch http://onsemi.com 7 V MC34063A, MC33063A 1 8 S Q Q2 R Q1 7 2 Ipk Rsc 0.24 Osc 6 Vin 4.5 V to 6.0 V 100 + 88 µH L CT VCC 3 + - Comp. + 1.25 V Ref Reg 5 1500 pF 1N5819 4 R1 R2 953 8.2 k 1.0 µH Vout -12 V/100 mA 1000 µf + Vout CO + 100 Optional Filter Test Conditions Results Line Regulation Vin = 4.5 V to 6.0 V, IO = 100 mA 3.0 mV = ±0.012% Load Regulation Vin = 5.0 V, IO = 10 mA to 100 mA 0.022 V = ±0.09% Output Ripple Vin = 5.0 V, IO = 100 mA 500 mVpp Short Circuit Current Vin = 5.0 V, RL = 0.1 Ω 910 mA Efficiency Vin = 5.0 V, IO = 100 mA 62.2% Output Ripple With Optional Filter Vin = 5.0 V, IO = 100 mA 70 mVpp Figure 11. Voltage Inverting Converter 8 1 1 Vout 8 7 2 7 Vout Vin 6 Vin 2 6 Figure 12. External Current Boost Connections for IC Peak Greater than 1.5 A 12a. External NPN Switch 12b. External PNP Saturated Switch http://onsemi.com 8 MC34063A, MC33063A 5.45′′ 2.500′′ (Top view, copper foil as seen through the board from the component side) MC34063A MC34063A MC34063A (Top View, Component Side) *Optional Filter. Figure 13. Printed Circuit Board and Component Layout (Circuits of Figures 7, 9, 11) INDUCTOR DATA Converter Inductance (µH) Turns/Wire Step–Up 170 38 Turns of #22 AWG Step–Down 220 48 Turns of #22 AWG Voltage–Inverting 88 28 Turns of #22 AWG All inductors are wound on Magnetics Inc. 55117 toroidal core. http://onsemi.com 9 MC34063A, MC33063A Calculation Step–Up V out V ton/toff V F in(min) V sat in(min) (ton + toff) V out V |V out| V 10–5 Ipk(switch) 2I out(max) (V 4.0 x t on 1 t off 2I t on(max) 10–5 (V in(min) I I ripple(pp) (ton + toff) – toff 4.0 x 10–5 ton ton 2I out(max) 0.3/Ipk(switch) I outt on V off ton 1 t off (ton + toff) – toff ton V sat) in(min) I pk(switch) 9 F V sat t on t off ton 1 t off 0.3/Ipk(switch) in 1 f t on t (ton + toff) – toff 4.0 x V 1 f off ton 1 t off CT CO Voltage–Inverting F V sat V out in(min) t on t ton L(min) V Step–Down 1 f toff Rsc V V sat V out) pk(switch) t (t t ) pk(switch) on off 8V ripple(pp) on(max) out(max) t on 1 t off 0.3/Ipk(switch) (V V sat) in(min) I pk(switch) 9 t on(max) I outt on V ripple(pp) Vsat = Saturation voltage of the output switch. VF = Forward voltage drop of the output rectifier. The following power supply characteristics must be chosen: Vin – Nominal input voltage. Vout – Desired output voltage, |V out| 1.25 1 R2 R1 Iout – Desired output current. fmin – Minimum desired output switching frequency at the selected values of Vin and IO. Vripple(pp) – Desired peak–to–peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. NOTE: For further information refer to Application Note AN920A/D and AN954/D. Figure 14. Design Formula Table http://onsemi.com 10 MC34063A, MC33063A ORDERING INFORMATION Device Package Shipping SO–8 98 Units / Rail MC33063ADR2 SO–8 2500 Units / Tape & Reel MC33063AP1 DIP–8 50 Units / Rail MC33063AVD SO–8 98 Units / Rail MC33063AVDR2 SO–8 2500 Units / Tape & Reel MC33063AVP DIP–8 50 Units / Rail MC34063AD SO–8 98 Units / Rail MC34063ADR2 SO–8 2500 Units / Tape & Reel MC34063AP1 DIP–8 50 Units / Rail MC34063BD SO–8 98 Units / Rail MC34063BDR2 SO–8 2500 Units / Tape & Reel MC33063AD MC34063AM SOEIAJ–8 94 Units / Rail MC34063AMEL SOEIAJ–8 1000 Units / Tape & Reel MC34063AML1 SOEIAJ–8 1000 Units / Tape & Reel MC34063AML2 SOEIAJ–8 2000 Units / Tape & Reel MC34063AMR1 SOEIAJ–8 1000 Units / Tape & Reel MC34063AMR2 SOEIAJ–8 2000 Units / Tape & Reel MARKING DIAGRAMS PDIP–8 P, P1 SUFFIX CASE 626 PDIP–8 P, P1 SUFFIX CASE 626 8 8 3x063AP1 AWL YYWW SO–8 D SUFFIX CASE 751 8 33063AVP AWL YYWW x z A WL, L YY, Y WW, W 34063 ALYWz 1 1 = 3 or 4 = A denotes AD suffix J denotes BD suffix = Assembly Location = Wafer Lot = Year = Work Week http://onsemi.com 11 SOEIAJ–8 M SUFFIX CASE 968 8 8 3x063 ALYWz 1 1 SO–8 D SUFFIX CASE 751 M063A ALYW 1 MC34063A, MC33063A PACKAGE DIMENSIONS PDIP–8 P, P1 SUFFIX PLASTIC PACKAGE CASE 626–05 ISSUE K 8 5 NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. –B– 1 4 F NOTE 2 –A– DIM A B C D F G H J K L M N L C J –T– N SEATING PLANE D M K MILLIMETERS MIN MAX 9.40 10.16 6.60 6.10 4.45 3.94 0.51 0.38 1.78 1.02 2.54 BSC 1.27 0.76 0.30 0.20 3.43 2.92 7.62 BSC 10° 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC 10° 0.030 0.040 G H 0.13 (0.005) A T M M B M SO–8 D SUFFIX PLASTIC PACKAGE CASE 751–06 ISSUE T D A 8 E 5 0.25 H 1 M B M 4 h B X 45 e A C SEATING PLANE L 0.10 A1 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. C B 0.25 M C B S A S http://onsemi.com 12 DIM A A1 B C D E e H h L MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0 7 MC34063A, MC33063A SOEIAJ–8 M SUFFIX PLASTIC PACKAGE CASE 968–01 ISSUE O 8 LE 5 Q1 E HE M° 1 4 L Z DETAIL P D e A1 A P b 0.13 (0.005) M c 0.10 (0.004) http://onsemi.com 13 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER 3. DIMENSION D AND E DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS AND ARE MEASURED AT THE PARTING LINE. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 5. THE LEAD WIDTH DIMENSION (b) DOES NOT INCLUDE DAMBAR PROTUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE LEAD WIDTH DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OR THE FOOT MINIMUM SPACE BETWEEN PROTRUSIONS AND ADJACENT LEAD TO BE 0.46 (0.018). DIM A A1 b c D E e HE L LE M Q1 Z MILLIMETERS MIN MAX --2.05 0.05 0.20 0.35 0.50 0.18 0.27 5.10 5.50 5.10 5.45 1.27 BSC 7.40 8.20 0.50 0.85 1.10 1.50 0° 10° 0.70 0.90 --0.94 INCHES MIN MAX --0.081 0.002 0.008 0.014 0.020 0.007 0.011 0.201 0.217 0.201 0.215 0.050 BSC 0.291 0.323 0.020 0.033 0.043 0.059 0° 10° 0.028 0.035 --0.037 MC34063A, MC33063A Notes http://onsemi.com 14 MC34063A, MC33063A Notes http://onsemi.com 15 MC34063A, MC33063A ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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