Order this document by MC34063A/D 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 * * * * * * SEMICONDUCTOR TECHNICAL DATA 8 Low Standby Current 1 Current Limiting P, P1 SUFFIX PLASTIC PACKAGE CASE 626 Output Switch Current to 1.5 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference 8 1 D SUFFIX PLASTIC PACKAGE CASE 751 (SO-8) PIN CONNECTIONS Representative Schematic Diagram 1 Drive 8 Collector Q2 S Q Ipk Sense Q1 R 7 Switch Collector 100 2 Switch Collector 1 8 Driver Collector Switch Emitter 2 7 Ipk Sense Timing Capacitor 3 6 VCC Gnd 4 5 Comparator Inverting Input Switch Emitter (Top View) Ipk Oscillator CT 6 VCC 3 Comparator + - ORDERING INFORMATION Timing Capacitor Device 1.25 V Reference Regulator Comparator 5 Inverting Input MC33063AD 4 MC33063AP1 Operating Temperature Range TA = - 40 to +85C Package SO-8 Plastic DIP Gnd MC33063AVD (Bottom View) MC33063AVP SO-8 TA = -40 to +125C MC34063AD This device contains 51 active transistors. MC34063AP1 SO-8 TA = 0 to +70C Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA Plastic DIP Plastic DIP Rev 5 1 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 VCE(switch) 40 Vdc Switch Collector to Emitter Voltage Driver Collector Voltage VC(driver) 40 Vdc Driver Collector Current (Note 1) IC(driver) 100 mA Switch Current ISW 1.5 A Power Dissipation and Thermal Characteristics Plastic Package, P, P1 Suffix TA = 25C Thermal Resistance SOIC Package, D Suffix TA = 25C Thermal Resistance PD RJA 1.25 100 W C/W PD RJA TJ 625 160 W C/W +150 C Operating Junction Temperature Operating Ambient Temperature Range MC34063A MC33063AV MC33063A C TA 0 to +70 -40 to +125 - 40 to + 85 Storage Temperature Range Tstg - 65 to +150 C NOTES: 1. Maximum package power dissipation limits must be observed. 2. ESD data available upon request. ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 3], unless otherwise specified.) Characteristics Symbol Min Typ Max Unit Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25C) fosc 24 33 42 kHz Charge Current (VCC = 5.0 V to 40 V, TA = 25C) Ichg 24 35 42 A Idischg 140 220 260 A Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25C) Idischg/Ichg 5.2 6.5 7.5 - Current Limit Sense Voltage (Ichg = Idischg, TA = 25C) Vipk(sense) 250 300 350 mV Saturation Voltage, Darlington Connection (Note 5) ( ISW = 1.0 A, Pins 1, 8 connected) VCE(sat) - 1.0 1.3 V Saturation Voltage, Darlington Connection (ISW = 1.0 A, RPin 8 = 82 to VCC, Forced VCE(sat) - 0.45 0.7 V hFE 50 75 - - IC(off) - 0.01 100 A OSCILLATOR Discharge Current (VCC = 5.0 V to 40 V, TA = 25C) OUTPUT SWITCH (Note 4) ] 20) DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25C) Collector Off-State Current (VCE = 40 V) NOTES: 3. Tlow = 0C for MC34063A, - 40C for MC33063A, AV Thigh = +70C for MC34063A, + 85C for MC33063A, +125C 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 s 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 b of output switch : 10 IC driver - 7.0 mA * *The 100 resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts. w 2 MOTOROLA ANALOG IC DEVICE DATA MC34063A MC33063A ELECTRICAL CHARACTERISTICS (continued) (VCC = 5.0 V, TA = Tlow to Thigh [Note 3], unless otherwise specified.) Characteristics Symbol Min Typ Max Unit 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 COMPARATOR Threshold Voltage TA = 25C 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) NOTES: 3. Tlow = 0C for MC34063A, - 40C for MC33063A, AV Thigh = +70C for MC34063A, + 85C for MC33063A, +125C 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 s 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 b of output switch : 10 IC driver - 7.0 mA * *The 100 resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts. w Figure 2. Timing Capacitor Waveform 500 200 100 VCC = 5.0 V Pin 7 = VCC Pin 5 = Gnd TA = 25C 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) MOTOROLA ANALOG IC DEVICE DATA 5.0 10 200 mV/DIV 1000 V OSC , OSCILLATOR VOLTAGE (V) t on-off , OUTPUT SWITCH ON-OFF TIME ( s) Figure 1. Output Switch On-Off Time versus Oscillator Timing Capacitor VCC = 5.0 V Pin 7 = VCC Pin 2 = Gnd Pins 1, 5, 8 = Open CT = 1.0 nF TA = 25C 10 s/DIV 3 MC34063A MC33063A Figure 4. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current 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 = 25C (See Note 4) 1.2 1.1 1.0 0.4 0.6 0.8 1.0 1.2 IE, EMITTER CURRENT (A) 1.4 Darlington Connection 0.8 0.7 0.6 VCC = 5.0 V Pin 7 = VCC Pins 2, 3, 5 = Gnd TA = 25C (See Note 4) 0.5 0.4 0.3 0.2 Forced = 20 0.1 0 1.6 0 Figure 5. Current Limit Sense Voltage versus Temperature 0.2 0.4 0.6 0.8 1.0 1.2 IC, COLLECTOR CURRENT(A) 1.4 1.6 Figure 6. Standby Supply Current versus Supply Voltage 3.6 400 380 3.2 VCC = 5.0 V Ichg = Idischg 360 340 320 300 280 260 240 220 200 -55 NOTE: 4 0.2 I CC , SUPPLY CURRENT (mA) V IPK(sense), CURRENT LIMIT SENSE VOLTAGE (V) 0 1.1 1.0 0.9 2.8 2.4 2.0 1.6 1.2 CT = 1.0 nF Pin 7 = VCC Pin 2 = Gnd 0.8 0.4 0 -25 0 25 50 75 TA, AMBIENT TEMPERATURE (C) 100 125 0 5.0 10 15 20 25 30 VCC, SUPPLY VOLTAGE (V) 35 40 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. MOTOROLA ANALOG IC DEVICE DATA MC34063A MC33063A Figure 7. Step-Up Converter 170 H L 8 1 180 S Q Q2 R Q1 7 2 1N5819 Ipk Rsc 0.22 Vin 12 V Osc 6 + CT 3 CT VCC 100 + - Comp. 1.25 V Ref Reg 1500 pF 5 4 1.0 H R2 R1 Vout 28 V/175 mA 47 k 2.2 k Vout + 330 + CO 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 8. External Current Boost Connections for IC Peak Greater than 1.5 A 8a. External NPN Switch 8b. External NPN Saturated Switch (See Note 5) 8 7 1 R Vout 8 7 2 Rsc Vin NOTE: Rsc 6 Vin 6 Vout 1 2 0 for R constant Vin 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 s 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. MOTOROLA ANALOG IC DEVICE DATA 5 MC34063A MC33063A Figure 9. Step-Down Converter 1 8 S Q Q2 Q1 R 7 2 Ipk Rsc 0.33 Vin 25 V Osc 6 100 + CT VCC + - Comp. 1.25 V Ref Reg 5 1N5819 3 L CT 220 H 470 pF 4 3.6 k R1 1.0 H Vout 5.0 V/500 mA R2 + 1.2 k 470 + 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 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 10. External Current Boost Connections for IC Peak Greater than 1.5 A 10a. External NPN Switch 8 10b. External PNP Saturated Switch 1 1 Vout 8 7 Vout Rsc Vin 6 7 2 6 2 Rsc Vin 6 MOTOROLA ANALOG IC DEVICE DATA MC34063A MC33063A Figure 11. Voltage Inverting Converter 1 8 S Q Q2 R Q1 7 2 Ipk Rsc 0.24 Osc 6 Vin 4.5 V to 6.0 V L CT VCC 88 H 3 + 100 + - Comp. + 1.25 V Ref Reg 5 1500 pF 1N5819 4 1.0 H R1 Vout -12 V/100 mA 953 R2 1000 f 8.2 k + 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 = 0.1 910 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 12. External Current Boost Connections for IC Peak Greater than 1.5 A 12a. External NPN Switch 8 12b. External PNP Saturated Switch 1 1 Vout 8 7 2 7 Vout Vin 6 MOTOROLA ANALOG IC DEVICE DATA Vin 2 6 7 MC34063A MC33063A Figure 13. Printed Circuit Board and Component Layout (Circuits of Figures 7, 9, 11) 5.45 2.500 (Top view, copper foil as seen through the board from the component side) MC34063A MC34063A MC34063A *Optional Filter. (Top View, Component Side) INDUCTOR DATA Converter Inductance (H) 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. 8 MOTOROLA ANALOG IC DEVICE DATA MC34063A MC33063A Figure 14. Design Formula Table Calculation Step-Up ) VF * Vin(min) V * Vsat in(min) ton/toff V out (ton + toff) t on ton t off ton CO 2I out(max) t on ton t off )1 2I 0.3/Ipk(switch) (V * V sat) in(min) I pk(switch) 9 t on(max) ripple(pp) 1 f ) toff )1 out(max) 0.3/Ipk(switch) (V * t on ton t off ) ) toff )1 (ton + toff) - toff 4.0 x 10-5 ton * Vout) V sat in(min) I pk(switch) I I outt on V V (ton + toff) - toff 4.0 x 10-5 ton t on t off ) VF * V sat in |V out| 1 f ) toff )1 Ipk(switch) L(min) ) VF * V sat * V out in(min) (ton + toff) - toff 4.0 x 10-5 ton CT Voltage-Inverting V out V 1 f toff Rsc Step-Down (t t ) pk(switch) on off 8V ripple(pp) 2I on(max) t on t off )1 0.3/Ipk(switch) (V t out(max) * 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. R2 1.25 1 Vout - Desired output voltage, |V out| 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 Vripple(pp) - 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. + ) MOTOROLA ANALOG IC DEVICE DATA 9 MC34063A MC33063A OUTLINE DIMENSIONS 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 -A- NOTE 2 DIM A B C D F G H J K L M N L C J -T- N SEATING PLANE D H 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 1.01 0.76 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 0.13 (0.005) M T A M B M D SUFFIX PLASTIC PACKAGE CASE 751-05 (SO-8) ISSUE P NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. -A- 8 5 -B- 1 4X P 0.25 (0.010) 4 M 8X D 0.25 (0.010) 10 K M T B SEATING PLANE S M R C -T- B A M_ S X 45 _ F J DIM A B C D F G J K M P R MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.18 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.189 0.196 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.007 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019 MOTOROLA ANALOG IC DEVICE DATA MC34063A MC33063A NOTES MOTOROLA ANALOG IC DEVICE DATA 11 MC34063A MC33063A Motorola reserves the right to make changes without further notice to any products herein. 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