Application Note 30 February 1989 Switching Regulator Circuit Collection John Seago Switching regulators are of universal interest. Linear Technology has made a major effort to address this topic. A catalog of circuits has been compiled so that a design engineer can swiftly determine which converter type is best. This catalog serves as a visual index to be browsed through for a specific or general interest. The catalog is organized so that converter topologies can be easily found. There are 12 basic circuit categories: Battery, Boost, Buck, Buck-Boost, Flyback, Forward, High Voltage, Multioutput, Off Line, Preregulator, Switched Capacitor and Telecom. Additional circuit information can be located in the references listed in the index. The reference works as follows, i.e., AN8, Page 2 = Application Note 8, Page 2; LTC1044 DS = LTC1044 data sheet; DN17 = Design Note 17. DRAWING INDEX FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE Battery 2A Converter with 150µA Quiescent Current (6V to 12V) 200mA Output Converter (1.5V to 5V) Up Converter (6V to 15V) Regulated Up Converter (5V to 10V) Boost Converter (1.5V to 5V) Up Converter (1.5V to 5V) Single Cell Up Converter (1.5V to 5V) The Low Quiescent Current Loop Applied to a Buck Converter (8V-16V to 5V) Low Power Switching Regulator (9V to 5V) Micropower Switching Regulator (5.8V-10V to 5V) Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) 800µA Output Converter (1.5V to 5V) Switching Preregulated Linear Regulator (9V to 5V) Micropower Post Regulated Switching Regulator (6V-10V to 5V) Generating CMOS Logic Supply from 2 Mercury Batteries (2.4V to 4.8V) Battery Splitter (9V to ±4.5V) Regulated Voltage Up Converter Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 18 Figure 23 Figure 24 Figure 30 Figure 40 Figure 49 Figure 51 Figure 71 Figure 72 Figure 76 6 7 7 8 8 8 8 14 17 17 20 26 31 32 38 38 39 AN29, Page 9 AN29, Page 15 AN8, Page 9/LT1013 DS LT1018 DS AN15, Page 7/LT1018 DS LM10 DS AN8, Page 8 AN29, Page 12 AN8, Page 4/LT1013 DS AN23, Page 15 AN29, Page 13 AN29, Page 14 AN8, Page 5/LT1013 DS AN23, Page 16 LTC1044 DS AN8, Page 2/LTC1044 DS AN8, Page 7/LTC1044 DS Boost Boost Converter (5V to 12V) Voltage Boosted Boost Converter (15V to 100V) Current Boosted Boost Converter (16V-24V to 28V) Negative Boost Regulator (–15V to –28V) 2A Converter with 150µA Quiescent Current (4.5V-8V to 12V) 200mA Output Converter (1.5V to 5V) Up Converter (6V to 15V) Regulated Up Converter (5V to 10V) Boost Converter (1.5V to 5V) Up Converter (1.5V to 5V) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 5 5 5 5 6 7 7 8 8 8 AN19, Page 13/AN25, Page 2/LT1070 DS AN19, Page 37/LT1070 DS AN19, Page 40/LT1070 DS AN19, Page 38/LT1070 DS AN29, Page 9 AN29, Page 15 AN8, Page 9/LT1013 DS LT1018 DS AN15, Page 7/LT1018 DS LM10 DS an30fa AN30-1 Application Note 30 DRAWING INDEX FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE Boost (Continued) Single Cell Up Converter (1.5V to 5V) Single Inductor, Dual Polarity Regulator (6V to ±15V) Single Inductor Regulated Converter (5V to ±15V) Low Noise Converter (5V to ±15V) Ultralow Noise Sine Wave Drive Converter (5V to ±15V) Single Inductor, Dual Output Converter (5V to ±15V) Basic Flash EPROM VPP Pulse Generator (5V to 12.75V or 12V) High Repetition Rate VPP Pulse Generator (5V to 12.75V or 12V) Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 87 Figure 88 8 9 10 11 12 13 43 43 AN8, Page 8 AN8, Page 10/LT1013 DS AN29, Page 6 AN29, Page 2 AN29, Page 4 Buck Positive Buck Converter (15V-35V to 5V) The Low Quiescent Current Loop Applied to a Buck Converter (8V-16V to 5V) Positive Buck Converter (7V-15V to 5V) Positive Buck Converter Negative Buck Converter (–20V to – 5.25V) 90% Efficiency Positive Buck Converter with Synchronous Switch (9.5V-14V to 5V) Low Power Switching Regulator (9V to 5V) Micropower Switching Regulator (5.8V-10V to 5V) 5V, 1A Regulator (8V-30V to 5V) High Power Linear Regulator with Switching Preregulator Linear Regulator with Switching Preregulator Switching Preregulated Linear Regulator (9V to 5V) Low Dissipation Regulator (10V-20V to 5V) Micropower Post Regulated Switching Regulator (6V-10V to 5V) High Current Low Dissipation Preregulated Linear Regulator Switching Preregulator for Wide Input Voltage Range (7.5V-30V to 5V) High Current Positive Buck with Bootstrapped NMOS Gate Drive (15V-35V to 5V) Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 46 Figure 48 Figure 49 Figure 50 Figure 51 Figure 52 Figure 53 Figure 89 13 14 15 15 16 16 17 17 18 30 31 31 32 32 33 33 44 AN29, Page 23 AN29, Page 12 Buck-Boost Positive Buck-Boost Converter (15V-35V to 28V) Nonisolated Regulator (– 48V to 5V) Positive-to-Negative Buck-Boost Converter (10V-30V to –12V) Figure 26 Figure 27 Figure 28 18 19 19 AN29, Page 24 AN19, Page 20/AN25, Page 4/AN29, Page 21 AN19, Page 39/LT1070 DS Flyback Flyback Converter (20V-30V to 5V) Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) Totally Isolated Converter (5V to ±15V) Input Positive Output Negative Flyback Converter (3.5V-35V to –5V) High Efficiency Flux Sensed Isolated Converter (12V to 5V) Positive Current Boosted Buck Converter (28V to 5V) Negative Current Boosted Buck Converter Negative Input-Negative Output Flyback Converter Positive Input-Negative Output Flyback Converter Fully Isolated Regulator (–48V to 5V) Low IQ, Isolated Converter (5V to ±15V) 800µA Output Converter (1.5V to 5V) Multioutput Flyback Converter (12V to 5V, ±12V) Multioutput, Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 Figure 85 Figure 86 20 20 21 21 22 22 23 23 24 24 25 26 42 42 AN19, Page 26/AN29, Page 20/LT1070 DS AN29, Page 13 AN19, Page 30/LT1070 DS AN29, Page 22 AN29, Page 19 AN19, Page 34/LT1070 DS AN19, Page 36/LT1070 DS AN19, Page 36/LT1070 DS AN19, Page 37/LT1070 DS AN25, Page 6 AN29, Page 7 AN29, Page 14 DN18 DN18 DN17 DN17 AN19, Page 23 AN19, Page 17/LT1070 DS AN29, Page 18 AN8, Page 4/LT1013 DS AN23, Page 15 LT3524 DS AN29, Page 25/LT1083 DS AN2, Page 3 AN8, Page 5/LT1013 DS LT1035 DS AN23, Page 16 AN2, Page 4/LT1038 DS LT1020 DS an30fa AN30-2 Application Note 30 DRAWING INDEX FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE Forward Forward Converter (20V-30V to 5V) Figure 41 27 AN19, Page 41/LT1070 DS High Voltage Nonisolated Converter (15V to 1000V) Isolated Output Converter (15V to 1000V) Converter with 20,000V Isolation (15V to 10V) Figure 42 Figure 43 Figure 44 27 28 28 AN29, Page 26 AN29, Page 27 AN29, Page 28 Multioutput Single Inductor, Dual Polarity Regulator (6V to ±15V) Single Inductor Regulated Converter (5V to ±15V) Low Noise Converter (5V to ±15V) Ultralow Noise Sine Wave Drive Converter (5V to ±15V) Single Inductor, Dual Output Converter (5V to ±15V) Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) Totally Isolated Converter (5V to ±15V) Low IQ, Isolated Converter (5V to ±15V) Dual Preregulated Supply (90V AC-130V AC to ±12V) Dual Output Voltage Doubler Switched Capacitor Converter (5V to ±12V) Switched Capacitor Charge Pump-Based Voltage Multiplier (5V to ±12V) Dual Output Switched Capacitor Voltage Generator Switched Capacitor-Based Converter (6V to ±7V) Voltage Multiplier (±5V to ±15V) High Current Switched Capacitor Converter (6V to ±5V) Multioutput Flyback Converter (12V to 5V, ±12V) Multioutput, Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 30 Figure 31 Figure 39 Figure 47 Figure 60 Figure 61 Figure 62 Figure 78 Figure 79 Figure 81 Figure 84 Figure 85 Figure 86 9 10 11 12 13 20 21 25 30 35 35 36 39 40 41 41 42 42 AN8, Page 10/LT1013 DS AN29, Page 6 AN29, Page 2 AN29, Page 4 AN29, Page 13 AN19, Page 30/LT1070 DS AN29, Page 7 LT1086 DS LT1054 DS AN29, Page 30/LT1054 DS AN29, Page 31 LT1026 DS AN29, Page 31 LT1032 DS AN29, Page 29 DN18 DN18 Off Line 100W Off-Line Switching Regulator. DANGER! Lethal Potentials Present Figure 45 29 AN25, Page 8 Preregulator High Power Linear Regulator with Switching Preregulator Dual Preregulated Supply (90V AC-130V AC to ±12V) Linear Regulator with Switching Preregulator Switching Preregulated Linear Regulator (9V to 5V) Low Dissipation Regulator (10V-20V to 5V) Micropower Post Regulated Switching Regulator (6V-10V to 5V) High Current Low Dissipation Preregulated Linear Regulator Switching Preregulator for Wide Input Voltage Range (7.5V-30V to 5V) Figure 46 Figure 47 Figure 48 Figure 49 Figure 50 Figure 51 Figure 52 Figure 53 30 30 31 31 32 32 33 33 AN29, Page 25/LT1083 DS LT1086 DS AN2, Page 3 AN8, Page 5/LT1013 DS LT1035 DS AN23, Page 16 AN2, Page 4/LT1038 DS LT1020 DS Switched Capacitor Basic Voltage Inverter Basic Voltage Inverter/Regulator Negative Voltage Doubler Positive Doubler Switched Capacitor – VIN to VOUT Converter 100mA Regulating Negative Doubler Dual Output Voltage Doubler Switched Capacitor Converter (5V to ±12V) Figure 54 Figure 55 Figure 56 Figure 57 Figure 58 Figure 59 Figure 60 Figure 61 34 34 34 34 34 35 35 35 LT1054 DS LT1054 DS LT1054 DS AN29, Page 30/LT1054 DS AN29, Page 29 LT1054 DS LT1054 DS AN29, Page 30/LT1054 DS an30fa AN30-3 Application Note 30 DRAWING INDEX FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE Switched Capacitor (Continued) Switched Capacitor Charge Pump-Based Voltage Multiplier (5V to ±12V) Regulator (3.5V to 5V) Regulating 200mA Converter (12V to – 5V) Digitally Programmable Negative Supply Positive Doubler with Regulation Negative Doubler with Regulator Negative Voltage Converter Voltage Doubler Voltage Doubler Generating CMOS Logic Supply from 2 Mercury Batteries (2.4V to 4.8V) Battery Splitter (9V to ±4.5V) Paralleling for Lower Output Resistance Stacking for Higher Voltage Voltage Tripler/Quadrupler Regulated Voltage Up Converter (3V to 5V) Regulated Negative Voltage Converter Dual Output Switched Capacitor Voltage Generator Switched Capacitor-Based Converter (6V to ±7V) High Power Switched Capacitor Converter (12V to 5V) Voltage Multiplier (±5V to ±15V) Charge Pump Negative Voltage Generator Charge Pump Voltage Doubler High Current Switched Capacitor Converter (6V to ±5V) Figure 62 Figure 63 Figure 64 Figure 65 Figure 66 Figure 67 Figure 68 Figure 69 Figure 70 Figure 71 Figure 72 Figure 73 Figure 74 Figure 75 Figure 76 Figure 77 Figure 78 Figure 79 Figure 80 Figure 81 Figure 82 Figure 83 Figure 84 36 36 36 37 37 37 37 37 38 38 38 38 38 39 39 39 39 40 40 41 41 41 41 AN29, Page 31 LT1054 DS LT1054 DS LT1054 DS LT1054 DS LT1054 DS LTC1044 DS LTC1044 DS AN8, Page 6 LTC1044 DS AN8, Page 2/LTC1044 DS LTC1044 DS LTC1044 DS LTC1044 DS AN8, Page 7/LTC1044 DS AN8, Page 2/LTC1044 DS LT1026 DS AN29, Page 31 AN3, Page 16/AN8, Page 5/AN29, Page 32 LT1032 DS LT1020 DS LT1020 DS AN29, Page 29 Telecom Nonisolated Regulator (– 48V to 5V) Fully Isolated Regulator (– 48V to 5V) Figure 27 Figure 38 19 24 AN19, Page 20/AN25, Page 4/AN29, Page 21 AN25, Page 6 SUGGESTED READING Pulse Engineering Catalog—Switching Magnetics Pulse Engineering, Inc. P.O. Box 12235 San Diego, CA 92112 (619) 268-2400 Pressman, A.I., “Switching and Linear Power Supplies, Power Converter Design,” Hayden Book Co., Hasbrouck Heights, New Jersey, 1977, ISBN 0-8104-5847-0. Chryssis, G., “High Frequency Switching Power Supplies, Theory and Design,” McGraw Hill, New York, 1984, ISBN 0-07-010949-4 Williams, J., “Switching Regulators for Poets,” Linear Technology Corporation, Application Note 25. Williams, J., “Power Conditioning Techniques for Batteries,” Linear Technology Corporation, Application Note 8. Williams, J. and Huffman, B., “Some Thoughts on DC-DC Converters,” Linear Technology Corporation, Application Note 29. Williams, J., “Inductor Selection for LT1070 Switching Regulators,” Linear Technology Corporation, Design Note 8. Nelson, C., “LT1070 Design Manual,” Linear Technology Corporation, Application Note 19. an30fa AN30-4 Application Note 30 L2 10µH 5V L1** 150µH R4 680Ω 1W OUTPUT FILTER C3 100µF D2 VIN D1 VIN C3* 100µF + VSW LT1070 GND VC 12V 1A + C3 0.68µF C2 1000µF LT1070 R2 1.24k 1% *REQUIRED IF INPUT LEADS ≥ 2" **PULSE ENGINEERING 92113 R3 10k C2 0.047µF R2 1.24k AN30 F01 + C1 200µF AN30 F02 Figure 1. Boost Converter (5V to 12V) Figure 2. Voltage Boosted Boost Converter (15V to 100V) R4 C3 I VIN D1 VOUT 28V 4A N D2 VSW + VIN 16V TO 24V VOUT 100V 300mA FB VC GND TOTAL INDUCTANCE = 4mH INTERLEAVE PRIMARY AND SECONDARY FOR LOW LEAKAGE INDUCTANCE D1 R1 98k FB R3 1k C1 1µF VSW + VIN 15V R1 10.7k 1% 1 L1 N=5 R1 27k LT1070 + C1 FB VC GND R2 1.24k R3 C2 AN30 F03 Figure 3. Current Boosted Boost Converter (16V-24V to 28V) D2 VSW C4* 470µF + R1 27k LT1070 + + GND VIN –15V VIN L1 200µH VC FB R3 3.3k C2 0.22µF *REQUIRED IF INPUT LEADS ≥ 2" C1 1000µF RO (MINIMUM LOAD) C3 10µF R2 1.24k D1 VOUT –28V 1A AN30 F04 Figure 4. Negative Boost Regulator (–15V to – 28V) an30fa AN30-5 Application Note 30 – 3.6M* + + 47µF L1 50µH “LOW BATT” A2 1/2 LT1017 6VIN (4.5V TO 8V) 1.2M* MUR405 + VSW 12VOUT C1 2700µF R1* 1M R7 100k C3 1500pF LT1070 R2* 120k FB VC GND 6V R6 200Ω – + + A1 1/2 LT1017 C2 47µF 10pF (OPTIONAL) R3 2M R4 10k R5 180k 6V *1% METAL FILM RESISTOR L1 = PULSE ENGINEERING, INC. #PE-51515 = 1N4148 LT1004 1.2V AN30 F05 = 74C04 Figure 5. 2A Converter with 150µA Quiescent Current (4.5V-8V to 12V) an30fa AN30-6 Application Note 30 22µF + 1.5VIN L1 25µH 220µF + 1N5823 5VOUT VIN VSW Q2 2N3507 + 500µF 3.74k* OPTIONAL IF VSUPPY CAN EXCEED 1.7V LT1070 FB VC +V GND 1.5VIN 1k 10k 47k + 1N4148 100Ω 1.5V 0.01µF 2Ω 1.5VIN 6.8µF 10k 1k Q1 2N2907 – TO C1B “+” INPUT 665Ω* 75k LT1004 1.2V 100k 1k C1A 1/2 LT1018 + 68k 200k 1.5VIN 576Ω* – C1B 1/2 LT1018 100k + HP5082-2810 39k 1.5VIN 47k *1% METAL FILM RESISTORS L1 = PULSE ENGINEERING, INC. #PE-92100 AN30 F06 Figure 6. 200mA Output Converter (1.5V to 5V) INPUT 6V 22k 2N2222 OUTPUT 15V 50mA + 200k 2.2µF L1 1MHY LT1004 1.2V 5 220pF 1N5821 1M 220k 0.001µF 3 + LT1013 2 1 2N5262 8 LT1013 130k 6 7 – 4 + 300Ω + 100µF – 5.6k 0.1µF 5.6k AN30 F07 L1 = AIE–VERNITRON 24–104 78% EFFICIENCY Figure 7. Up Converter (6V to 15V) an30fa AN30-7 Application Note 30 5V 400mH* 1.5V 1N4148 100k + 2 – 0.1µF 200k 3 8 1/2 LT1018 + OUTPUT 10V 2mA – 1M 22µF – 100k C1A 1/2 LT1018 2M + HP50822810 1N4148 1M + L1 4.7mH C1B 1/2 LT1018 + 100µF 2000pF 365k* EOUT 5V 7 – 110k R1** 910k *DALE TE-5/Q3/400mH ( ) 100k* 56.2k* 120k* 120k 47µF *1% FILM RESISTOR L1 = RL1123-47-RENCO, INC AN30 F08 Figure 8. Regulated Up Converter (5V to 10V) AN30 F09 Figure 9. Boost Converter (1.5V to 5V) 15k 1.5V Q1 1N100A Q2 Q1 4 EVEREADY 850 D1 15k 0.1µF 10k T1 47µF 1N914 + LT1034 1.2V R2** 120k **VOUT = 1.2 1 + R1 R2 0.0022µF 15k T1 470Ω 47µF 15k 5 2 6 3 300pF 5V OUT TO CMOS SYSTEM 5V OUTPUT 1 + 1/2 LT1018 6 + 4 LT1004 1.2V 5 1 1N4148 220pF 1N100A Q3 0.004µF + D2 + 5.1M 1.5V (BAT) – + REF 4 + – LM10 200k OUTPUT ADJUST OP AMP 7 6 10M LM10 Q2 – 2 8 1 330k 2k 3 REF 200mV R 250k 0.1µF AN30 F11 – AN30 F10 D1, D2 = 1N933 (GERMANIUM) Q1, Q2 = 2N2222A R = OUTPUT ADJUST T1 = STANCOR PCT-39 THIS 1.5V BATTERY TO 5V OUTPUT DESIGN CAN DRIVE LOW POWER CIRCUITRY FOR MONTHS Figure 10. Up Converter (1.5V to 5V) REF AMP + 200mV REF T1 = TRIAD SP-29 Q1 TO Q3 = 2N1194 Figure 11. Single Cell Up Converter (1.5V to 5V) an30fa AN30-8 Application Note 30 6V 1µF + 6V 15pF 10k 22k 1N914 10k 2N3906 L1 1mH Q2 16V 1 + 10k 22k 2N3904 15VOUT 16V 8 10µF 3 LT1013 10µF 15pF 1N914 200k VOUT ADJ 6V 100k 4 10k 1.4M 0.005µF 2 –16V 82k 7 6 + D2 Q2 – Q1 2N4391 74C00 + CLK 1 74C74 D1 –16V CLK 2 + 100kHz INPUT Q1 – +V 5 LT1004 1.2V LT1013 L1 = 24-104 AIE VERNITRON = 1N4148 0.005µF ±5mA OUTPUT 75% EFFICIENCY 1M –15VOUT 2N5114 AN30 F12 Figure 12. Single Inductor, Dual Polarity Regulator (6V to ±15V) an30fa AN30-9 Application Note 30 150k* 5V 12.4k* HP5082-2810 + 300Ω C1A 1/2 LT1018 5V 10k – 2k 100Ω 32k φ2 10k 4.7k Q3 2N5023 Q1 2N3906 –15VOUT 100µF 1000pF + 5 L1 145µH 74C90 ÷ 10 10k 5V φ1 12 4.7k Q2 2N3904 + 100Ω 2k 5V 10k Q2 2N3507 300Ω 15VOUT 100µF 137k* + C1B 1/2 LT1018 – 12.4k* 1k 5V *1% METAL FILM RESISTOR L1 = PULSE ENGINEERING, INC. #PE-92105 AN30 F13 LT1004 1.2V = 1N4148 = 74C14 Figure 13. Single Inductor Regulated Converter (5V to ±15V) an30fa AN30-10 0.001µF CLK NONOVERLAP GENERATOR 74C14 74C14 φ1 φ2 15kHz, 5µs NONOVERLAP 74C02 74C02 Q CK 74C74 10k Q2 LEVEL SHIFTS Q1 74C14 74C14 10k 10k D Q 10OΩ 150k 10OΩ 0.001µF 0.001µF POINT “A” BOOST OUTPUT ≈17V DC = FERRITE BEAD, FERRONICS #21-110J = ±15 COMMON = +5 GROUND 10k *1% FILM RESISTOR 150k FET = MOTOROLA MTP3055E NPN = 2N3904 PNP = 2N3906 L1 = PULSE ENGINEERING, INC # PE-61592 74C74 +V 100µF 1k D1 1N5817 Q6 Q5 8 9 2 3 5V D S 7 6 S 1 L1 5V D 4 D3 1N5817 0.001µF 470Ω TURBO BOOST D2 1N5817 Figure 14. Low Noise Converter (5V to ±15V) 22µF –4V DC 1N5817 47µF 0.003µF + 10µF 0.003µF 10OΩ 8 2 DRIVERS EDGE Q4 SHAPING 10OΩ 1k Q3 LT1054 BOOST 5 3 + + + 100µF MUR 120 (ALL) + 5VIN (4.5V TO 5.5V) 10µF 10µF LT337A + 100µF LT1086 + 1N5817 AN30 F14 2.74k* 249Ω* 2.74k* 249Ω* + + + 22k 1µF –15V OUT OUT COMMON 10µF 15V OUT Application Note 30 an30fa AN30-11 Q1 – – 3.1k + 1/2 LT1013 A2 OSCILLATOR STAB. LOOP 2k 0.22µF 680Ω 270Ω (SELECTED VALUE) 47µF 220Ω 8 A1 LT1006 + * = ±15 GROUND = +5 GROUND = 1N4934 = 1N4148 *1% METAL FILM RESISTOR † THF337K006P1G L1, L2 = PULSE ENGINEERING, INC #PE-92100 L3 = PULSE ENGINEERING, INC #PE-65064 UNMARKED NPN = 2N3904 1k + 1k 10k 200k 0.22µF 10k 0.01µF THERMALLY MATED 16kHz OSCILLATOR + 1k 1µF LT1009 2.5V 1k 1k* 820Ω 2k 20k 750Ω* – 5V 8 A3 LT1006 + 1k 430Ω 220Ω + 0.33µF – A4 1/2 LT1013 Q6 Q3 2N2905 Q2 2N2219 68Ω 1N4001 0.1µF 10k IQ CONTROL LOOP 1N4001 100Ω 50Ω 50Ω 620Ω 0.22µF 10k 330µF† Q4 MJE2955 0.1Ω Q5 MJE3055 0.1µF 1 8 22µF L3 4 + + * A8 LT1010 220µF * 10k* 1µF 0.005µF 330Ω A6 1/2 LT1013 – –19V UNREG 3 4 5 Figure 15. Ultralow Noise Sine Wave Drive Converter (5V to ±15V) 5V 430Ω POWER AMP 5VIN (4.5V TO 5.5V) 10k* 1N5260B * * 5k + L2 25µH 220µF 19V UNREG 8 A7 LT1010 0.1µF 10k* OUT COMMON 15VOUT L1 25µH AN30 F15 0.1µF + 47µF + 47µF –15VOUT 330Ω OUT LT1021 IN 10V 4.99k* A6 1/2 LT1013 – + + AN30-12 + 0.01µF Application Note 30 an30fa Application Note 30 L1 470µH MUR120** 5V 1N4001 1N4001 1N4001 12V 75mA + 470µF VIN VSW E1 LT1072CN8 + 100µF E2 GND 2µF 4.32k* FB VC 5.1k + 499Ω* 1k 100µF 1µF AN30 F16 –12V 75mA + 1 5 2 6 LT1054 3 10µF 4 7 0.05µF 20k* *1% FILM RESISTORS **MOTOROLA, MUR120 L1 = PULSE ENGINEERING, INC #PE-52648 215k* 2k 2N2222 8 100µF + Figure 16. Single Inductor, Dual Output Converter (5V to ±15V) Q1 IRF9Z30 (HEAT SINK) 1k 1k 2N3906 D1 1N4148 Q2 2N2222A 12V D2 1N759 (OPT) L1 170µH 5VOUT 5A D2 MBR735 (MOTOROLA) 1000µF + 0.1Ω VIN 12V TO 35V 51Ω 2W 2N6667 (HEAD SINK) 3.01k* VIN VSW E1 LT1072CN8 + 100µF E2 GND 2N2222 1N4148 FB VC 100Ω 1W 1N4148 1k* 1k 2N2222 5.1k 100µF 1k OPTIONAL 1k 1µF AN30 F17 *1% FILM RESISTORS L1 = PULSE ENGINEERING, INC #PE-92113 Figure 17. Positive Buck Converter (15V-35V to 5V) an30fa AN30-13 Application Note 30 Q1 IRF-9531 0.4Ω 12VIN 8V TO 16V 100Ω 5VOUT + 1k Q2 2N3906 L1 100µH Q4 2N3904 1500pF MUR405 2700µF 1M* 1M 100k 340k* + VIN 10µF VSW LT1072 FB GND VC 2k NC Q3 2N3904 12VIN 1N4148 – 200Ω 10k 1/2 LT1017 + + 1N4148 47µF 10k 470k 12VIN LT1004 1.2V 1N4148 10pF AN30 F18 *1% FILM RESISTOR L1 = PULSE ENGINEERING, INC #PE-92108 = 74C04 Figure 18. The Low Quiescent Current Loop Applied to a Buck Converter (8V-16V to 5V) an30fa AN30-14 Application Note 30 1Ω VIN 7V TO 15V 100Ω 1k 2N3906 2N2905 1N5819 (MOTOROLA) L1 470µH 220Ω 470µF + VIN VSW E1 LT1072CN8 + 10µF E2 GND 5VOUT 250mA 3.01k* FB VC 1N4148 1k* 1k 2N2222 1k 100pF 5.1k 1µF AN30 F19 *1% FILM RESISTORS L1 = PULSE ENGINEERING, INC. #PE-52648 Figure 19. Positive Buck Converter (7V-15V to 5V) VIN D3 1N4001 L2 4µH OPTIONAL OUTPUT FILTER VIN C5* 100µF + C3 2.2µF VSW + D2 1N914 R1 3.74k LT1070 C5 200µF FB GND VC R3 470Ω C1 1µF R2 1.24k r + R4 10Ω C2 1µF L1** 100µF D1 MBR745 *REQUIRED IF INPUT LEADS ≥2" **PULSE ENGINEERING 92112 + C4 1000µF 100mA MINIMUM 5V 4.5A AN30 F20 Figure 20. Positive Buck Converter an30fa AN30-15 Application Note 30 D1 VIN C3 100µF + L1** 200µH C2 1000µF VC – 5.2V 4.5A Q1 2N3906 LT1070 GND LOAD VSW + OPTIONAL INPUT FILTER R1 4.64k FB L3 OPTIONAL OUTPUT FILTER C1 R2 1.24k R3 VIN – 20V + C4 200µF L2 4µH *REQUIRED IF INPUT LEADS ≥ 2" **PULSE ENGINEERING 92113 AN30 F21 Figure 21. Negative Buck Converter (–20V to – 5.2V) 12VIN 9.5V TO 14.5V 50k 47pF 0.018Ω 100Ω 1k Q8** 2N3906 1N4148 Q7** 2N3906 5k 5k R1 619Ω Q3 2N2222 Q5 2N2222 D1 1N4148 VIN E1 + 220µF C1 0.1µF D3 1N4148 Q1 P50N05E VSW LT1072CN8 E2 GND L1 100µH FB VC 50Ω 3.01k* + 1N4148 Q6 2N2222 LT1004-2.5 9k 100Ω 3.5k Q9 2N2222 VOUT 5V 5A 220Ω 220Ω 1k 1µF Q4 VN2222LL D2 1N4148 1000µF 1k* Q2 P50N05E AN30 F22 *1% FILM RESISTORS **VBE MATCHING OF 20mV AT 200µA L1 = PULSE ENGINEERING, INC. #PE-92210K = P50N05E (MOTOROLA) IRFZ44 (INTERNATIONAL RECTIFIER) Figure 22. 90% Efficiency Positive Buck Converter with Synchronous Switch (9.5V-14V to 5V) an30fa AN30-16 Application Note 30 9V L1 10mHy Q1 2N2907A 10k 47µF 390k 10k EVEREADY E-92-6 CELLS 1µF 5VOUT + 1N4148 100pF 9V 0.01Ω + A2 LT1013 1N4148 100k + 50k OUTPUT ADJUST A1 LT1013 – – 1M 220k 9V LT1034 1.2V 1.2k L1 = DALE TE-3/Q3/TA AN30 F23 Figure 23. Low Power Switching Regulator (9V to 5V) 100mH DALE TE-5Q4-TA 5VOUT + 1N5817 47µF + +V INPUT V = 5.8V – 10V 74C907 (SEE DETAIL) – 74C907 DETAIL 390k* VCC INPUT OUTPUT 0.2Ω + 1N914 C2 1/2 LT1017 – +V 100k* 50k OUTPUT ADJUST – C1 1/2 LT1017 + 5pF +V 330k 47k HP5082 2810 1M LT1004 1.2V 12k *1% METAL FILM RESISTOR AN30 F24 Figure 24. Micropower Switching Regulator (5.8V-10V to 5V) an30fa AN30-17 Application Note 30 5k VIN ≥ 8V Q1 2N6191 600Ω 5V 1A L1 450µH Q2 2N3906 600Ω 15 5k 5k 16 + 10µF 0.1µF 1 5k 2 6.5k 6 510Ω VIN VREF C1 NI E1 INV C2 LT3524 12 + 0.1µF 11 500µF D1 MR850 13 14 RT E2 CT CL+ 4 COMP CL– GND 5 0.01µF 7 0.01µF 30k 9 8 0.15Ω AN30 F25 L1 = PULSE ENGINEERING #PE-92107 Figure 25. 5V, 1A Regulator (8V-30V to 5V) Q1 ERF9Z30 28V NOMINAL 15V TO 35V 1k Q2 2N2222A 7.5V 1N755 L1 330µH D4 MBR360 D3 MBR360 (MOTOROLA) 28V 250mA + 1000µF 1N4148 220Ω 1W + D1 1N4148 100µF VIN 26.1k* D2 MBR360 VSW E1 LT1072CN8 E2 GND FB VC 1.21k* 1k 1µF AN30 F26 *1% FILM RESISTORS L1 = PULSE ENGINEERING, INC #PE-52627 Figure 26. Positive Buck-Boost Converter (15V-35V to 28V) an30fa AN30-18 Application Note 30 3k 1/2W + 220Ω 100µF Q1 2N5550 1k 100µH PULSE ENGINEERING #51516 1N5936 30V –48V + 68V** OPTIONAL LOW DRIFT FEEDBACK CONNECTION * + 2.2µF VIN FROM 5V OUTPUT 5V OUTPUT 4A 3.01k 1% 1100µF† VSW LT1070HV G TO FB PIN Q2 2N5401 FB VC Q2 2N5401 3.9k 1% Q3 2N5401 2k – 48V 0V TO 60V INPUT 1.2k 1% 0.22µF TO –48V 1k 1% 3.01k 1% AN30 F27 *MUR810 (MOTOROLA) **1.5KE68A (MOTOROLA) † VPR1127R5E1E (MALLORY) Figure 27. Nonisolated Regulator (– 48V to 5V) VIN C4 5µF †TO AVOID START-UP R5† 470Ω 1W D3† 1N4001 C5* 100µF VSW VIN 10V TO 30V + LT1070 R1 10.7k GND VC D2 1N914 R4 47Ω C3 2µF C1† 1000µF PROBLEMS FOR INPUT VOLTAGES BELOW 10V, CONNECT ANODE OF D3 TO VIN AND REMOVE R5. C1 MAY BE REDUCED FOR LOWER OUTPUT CURRENTS. C1 ≈ (500µF)(IOUT) FOR 5V OUTPUTS, REDUCE R3 TO 1.5k, INCREASE C2 TO 0.3µF AND REDUCE R6 TO 100Ω. FB R3 5k C1 0.1µF R2 1.24k + + R6 470Ω D1 AN30 F28 L1** 200µH *REQUIRED IF INPUT LEADS ≥ 2" **PULSE ENGINEERING 92113 VOUT – 12V 2A Figure 28. Positive to Negative Buck-Boost Converter (10V-30V to –12V) an30fa AN30-19 Application Note 30 CLAMP TURN-ON SPIKE VSNUB L2 10µH OPTIONAL FILTER C4 200µF D1 VIN 20V TO 30V C3 0.47µF R4 + VOUT + VF 0V d ∆I • IPRI VSW PRIMARY CURRENT 0 R1 3.74k LT1070 IPRI N SECONDARY CURRENT 0 FB GND (N)(VIN) SECONDARY VOLTAGE AREA “c” = AREA “d” TO MAINTAIN ZERO DC VOLTS ACROSS SECONDARY c C1 2000µF N = 1/3 C4* 100µF b 0V VOUT 5V 6A 1 N D2 VIN + • V + VF PRIMARY FLYBACK VOLTAGE = OUT N LT1070/LT1071 SWITCH VOLTAGE AREA “a” = AREA “b” TO MAINTAIN ZERO DC VOLTS ACROSS PRIMARY a VIN IPRI VC R2 1.24k R3 1.5k C2 0.15µF LT1070 SWITCH CURRENT 0 IPRI SNUBBER DIODE CURRENT *REQUIRED IF INPUT LEADS ≥ 2" (I )(L ) t = PRI L VSNUB AN30 F29 Figure 29. Flyback Converter (20V-30V to 5V) MUR120 12VIN 12V LT1086 L1 • 7 8 22µF 1.2k* + + 470µF 10µF 11k* 9 MUR120 LT1086 4 2k 2W • 10 1.2k* + 2• 3 1• 10µF 11k* 11 0.2µF –12V MBR360 • + 5 VOUT 5V 1A C1 2700µF 6 R3 1M MUR120 VIN + 470µF VSW R1* 1M R7 10k 74C04(5) C3 0.005µF LT1071 12VIN FB VC R6 200Ω A1 1/2 LT1017 C2 47µF R2* 453k + + NC – GND 10pF 1N4148 1N4148 R4 10k R5 180k 12VIN *1% FILM RESISTOR L1 = PULSE ENGINEERING, INC #PE-65108 LT1004 1.2V AN30 F30 Figure 30. Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) an30fa AN30-20 Application Note 30 OPTIONAL OUTPUT FILTER D1 1:N C3 0.47µF R4 1.5k + • N + N VIN +V + IN 5V C5* 100µF • VSW L1 10µF 15V + C1 500µF COM C4 500µF –15V C6 200µF N = 0.875 = 7:8 FOR VOUT = 15V LT1070/LT1071 ≈16V SWITCH VOLTAGE FB GND + L2 10µF C5 200µF VC VIN 500Ω C2 5k 0.01µF tOFF 0V R2 tON VF (DIODE FORWARD VOLTAGE) VOUT SECONDARY VOLTAGE 0V *REQUIRED IF INPUT LEADS ≥ 2" AN30 F31 (N)(VIN) Figure 31. Totally Isolated Converter (5V to ±15V) VIN = 3.5V TO 35V OPTIONAL 5V 0.68µF MBR360 VIN 3 L1 5VOUT 1A 2 n=1 4 3 n=1 + 1000µF 510Ω 1W MBR360 4 (MOTOROLA) VIN 3.01k* •1 1k* 1% • 1k* 1% L1 Q3 2N3906 Q2 2N3906 VSW + VSW 100µF LT1070 FB FB GND VC 1k* 1k* 1k 1µF *1% FILM RESISTORS L1 = PULSE ENGINEERING, INC #PE-65050 • L1 2 n=1 Q1 2N2222 + 1 1000µF 3.32k* 1% AN30 F32 –5VOUT 1A D1 MBR360 Figure 32. Input Positive Output Negative Flyback Converter (3.5V-35V to – 5V) an30fa AN30-21 Application Note 30 MBR1060** L1 4 5VOUT 100mA TO 1A + 1000µF •5 MBR1060** 12VIN 0.47µF 680Ω 2k 3 • + 22µF •6 0.1µF 1 MBR360 VIN 8 3.40k* VSW + LT1070 100µF 1k FB GND VC 1.07k* 1k 1µF AN30 F33 *1% FILM RESISTORS **MOTOROLA L1 = PULSE ENGINEERING, INC #PE-65066 Figure 33. High Efficiency Flux Sensed Isolated Converter (12V to 5V) VIN 28V 470Ω 2W VIN R6 470Ω C3 0.47µF C6 0.002µF D2 VSW R2 1k VC • R7 1.24k D1 FB VIN 7 R3 680Ω C5* 100µF 6 – V+ 2 V – LM308 COMP 3 4 + + 1:N N ≈ 0.25 LT1070 GND • C1 0.33µF 8 200pF R5 5k R4 1.24k R1 5k + *REQUIRED IF INPUT LEADS ≥ 2" VOUT 5V 10A C2 5000µF AN30 F34 Figure 34. Positive Current Boosted Buck Converter (28V to 5V) an30fa AN30-22 Application Note 30 + R5 T1 1:N C3 • VIN + MINIMUM LOAD = 10mA C1 R1 R4 12k D1 Q1 2N3906 • VSW R1 = – VOUT 5V 10A VOUT – 0.6V 1mA LT1070 VC GND FB R2 1.24k R3 C2 – VIN AN30 F35 Figure 35. Negative Current Boosted Buck Converter C3 VIN + VSW R6 • T1 1:N • R2 5k R3 1k + Q1 2N3906 C1 R1* LT1070/LT1071 – VOUT GND VC FB R5 *R1 = VOUT – 1.6V 200µA R4 1.24k C2 – VIN AN30 F36 Figure 36. Negative Input-Negative Output Flyback Converter an30fa AN30-23 Application Note 30 R7 470Ω 2W C4 0.47µF L1 D2 MUR110 VIN + • 1/2 T1 VSW LT1070 VIN R2 1.24k R5 1k FB VC VIN R6 1k – GND C3 0.01µF R1 1k • VOUT LT1006 C2 1µF + R3 1.24k L1 = PULSE ENGINEERING INC #PE-65050 + R4 = R1 1/2 T1 C1 D1 • AN30 F37 –VOUT Figure 37. Positive Input-Negative Output Flyback Converter 4µH PULSE ENGINEERING #52901 OPTIONAL –48V RETURN 0.47µF 250V 10k 2k 5W MUR860 D + 47µF + PULSE ENGINEERING MBR735 #PE-64795 47k S MUR120 1N3026A 18V VSW 68V† FB NC GND + 10k Q4 47k 22µF Q3 NC –48VIN –40V TO –60V INPUT LT1071 220k Q2 47k 4• VIN VC 22k 10 5 100µF VZ = 7V 1• 100Ω 1/2W 2000µF** MUR120 Q1 + •6 5V OUTPUT 5A 50Ω G 50Ω Q5 IRF830 3k 2 50µF SPRAGUE TE1307 39.2k* 100Ω 12.1k* + 47k 0.47µF 7 10µF + 820Ω *1% METAL FILM RESISTOR **QLA202U7R5J1L (MALLORY) †1.5KE68A (MOTOROLA) “M” PREFIXED DIODES = MOTOROLA PNP = 2N3906 NPN = 2N3904 A1 LT1006 4N28 – 2k 10k 20Ω 1µF LT1004 1.2V 4 2M 0.1µF = 1N4148 36k 0.47µF AN30 F38 Figure 38. Fully Isolated Regulator (– 48V to 5V) an30fa AN30-24 LT1070 VSW 3 10k GND MUR120 1 0.47µF 5V 390k 4N46 + + 1N4148 7 8 9 = ±15 COMMON = +5 GROUND *1% FILM RESISTOR L1 = PULSE ENGINEERING, INC #PE-61592 VC FB Q1 2N3906 NC VIN 1.2k 2W 1N4148 47µF 47µF 216k* TO –15V TO –16V UNREG –16V PREREG 10k 20M C1A 1/2 LT1017 OPTIONAL 470k TO REF OUT 1.5M 3.2M 470k 0.002µF 10k 47k 5.6M C1B 1/2 LT1017 3 500k* 1.5k TO 16V PREREG 4 OUT AN30 F39 6 FB COMP NPN 100k 2.5V REF OUT VIN Q2 VN2222 7 +IN COMP PNP –IN 0.001µF 3M* 5 8 9 GND Figure 39. Low IQ, Isolated Converter (5V to ±15V) 82k 1.2M* + + L1 16V PREREG – – 5VIN 4.5V TO 5.5V 11 2 + 10µF 500k* 2.5M* + 0.001µF –15VOUT 100mA 10µF 15VOUT 100mA Application Note 30 an30fa AN30-25 Application Note 30 VIN 1.1V TO 2V NC 3.9M 150pF 4 5 1.5M 3 0.001µF 2 + NC 47µF + – 240k + 6 C2B 1/2 LT1017 150k 3.9M 5VOUT 4.3M* – C1A 1/2 LT1017 HP5082-2810 L1 C1B 1/2 LT1017 22pF 1 – + 2M 10M 360k 1.5V 1M* 619k* 470k 1M* 10M VIN LT1004 1.2V *1% METAL FILM RESISTOR L1 = TRIAD #SP-29 PNP = 2N3906 NPN = 2N3904 390k 10M 1.5V – C2A 1/2 LT1017 + OPTIONAL FOR NEGATIVE OUTPUT HP-5082-2810 1N4148 + HP5082-2810 4 1 620k 1.5V C2B 5 6 0.001µF 2.2µF 22pF + – 10M 47k C1B 3 5.1M 10k VIN 47µF + C2A LT1004 1.2V TO 390k OF C2B AN30 F40 Figure 40. 800µA Output Converter (1.5V to 5V) an30fa AN30-26 Application Note 30 D1 T1 C2 R4 • I M L1 70µH N • + D2 D3 VIN VIN 20V TO 30V C1 2000µF • VSW LT1070 GND VOUT 5V 6A VC R1 3.74k D4 FB Q1 R6 C4 330Ω R3 C3 R2 1.24k R5 1Ω AN30 F41 Figure 41. Forward Converter (20V-30V to 5V) 22µF 15V + SEMTECH FM-50 0.1µF 2000V L1 0.47µF 3 7 1 8 1k 1/2W VOUT 1000V 5W MUR120 15V VIN 10M* 1% VSW LT1072 FB GND 12.4k, 1% (IDEAL VALUE—PAD AS REQUIRED FOR 1000VOUT) VC AN30 F42 2µF *MAX-750-22 VICTOREEN, INC L1 = PULSE ENGINEERING, INC #PE-6197 Figure 42. Nonisolated Converter (15V to 1000V) an30fa AN30-27 Application Note 30 15VIN 1000VOUT 5W L1 1k 0.47µF VIN 0.1µF 2000V 7 1 MUR120 NC 3 0.1µF 10M** 1% D 8 Q1 VN2222 S VSW FB LT1072 180k 7 8 + A1 LT1006 3.6k VC 2.2M – 4 GND 200k* 200k 5k OUTPUT ADJUST 10k LT1004 1.2V 1M 4N46 10k* 0.68µF AN30 F43 1k 2µF *1% METAL FILM RESISTOR **VICTOREEN MAX-750-22 L1 = PULSE ENGINEERING, INC #PE-6197 = SEMTECH-FM-50 = INPUT GROUND = OUTPUT COMMON Figure 43. Isolated Output Converter (15V to 1000V) 2k 15V 15V – 0.002µF + 2k Q1 2N3904 LT1011 *1% METAL FILM RESISTOR PIEZOCERAMIC TRANSFORMERS AVAILABLE FROM CHANNEL INDUSTRIES, INC SANTA BARBARA, CA 1N4148 100Ω 470pF PRIMARY 1k PIEZOCERAMIC TRANSFORMER 15V 680Ω 1N4148 SECONDARY 3 VIN VOUT 10V FLOATING OUTPUT 2 + 10µF 0.001µF LT1020 GND 9 FB 1.5M* + 100µF 11 500k* FLOATING OUTPUT COMMON Figure 44. Converter with 20,000V Isolation (15V to 10V) an30fa AN30-28 RT = V150LA20 (GE) = 1N4148 = D504CS (MIDWEST COMPONENTS) = 2N3906 = 2N3904 *1% METAL FILM RESISTOR **QLA302V010J2L (MALLORY) Q5 = MTH7N50 2A SLOW BLOW 1N4005 ×4 20µF 470µF 250V 47k 1W Q2 47k NC 47k Q1 Q3 22k 3k 220k VIN 0.3Ω 22k 1.24k* Q4 + 100Ω 10µF 0.01µF Q6 LT1071 MUR120 Q5* 1• VC 2k VSW S D MUR860 50Ω G 4k 10W 50pF 1N3026A 18V GND FB 220k* 0.22µF 250V 3 12 9 7 4N28 15k 6 •5 B •A 100Ω 820Ω MUR120 WINDINGS FOR OPTIONAL ±12V DC OUTPUTS 1N5831 22µF 0.47µF Figure 45. 100W Off Line Switching Regulator DANGER! Lethal Potentials Present 47k 1/2W 47k 1/2W + + 90V AC TO 140V AC INPUT PULSE ENGINEERING #PE-64780 + 36k 4.3M 4 – A1 LT1006 10k 100Ω 1/2W OPTIONAL 3000µF** 7 + DANGER! LETHAL POTENTIALS PRESENT IN SCREENED AREA! DO NOT CONNECT GROUNDED TEST EQUIPMENT + RT 2k LT1004 1.2V 20Ω 1.2k* 3.8k* + 4µH PULSE ENGINEERING #52901 AN30 F45 + 1µF 5V OUT 50µF SPRAGUE TE-1307 Application Note 30 an30fa AN30-29 Application Note 30 1mH VIN 28V IN + LT1083 10,000µF MR1122 VOUT OUT ADJ 240Ω 470Ω 10k 1N914 28V 1k 1M 2k 4N28 AN30 F46 10k + LT1011 10k – 28V 1N914 Figure 46. High Power Linear Regulator with Switching Preregulator L1 285µH IN 1000µF MBR360 10k 1k + HEAT SINK 2N6667 Q1 DARLINGTON ADJ 30k + MDA201 8 4700µF + 7 – 12V 1.5A OUT 124Ω* 2.4k 510k + LT1086 LT1004-2.5 + 20k* 2 100µF 30.1k* D1 1N4002 1.07k* LT1011 – 3 4 L1 285µH STANCOR P-8685 IN HEAT SINK 2N6667 Q2 DARLINGTON 1000µF MBR360 10k 1k + 130VAC TO 90VAC 30k 8 4700µF + 7 – 124Ω* 2.4k + MDA201 OUT ADJ 510k + LT1086 2 LT1004-2.5 + 20k* 100µF 30.1k* 1.07k* D2 1N4002 LT1011 – 3 4 *1% FILM RESISTORS MDA = MOTOROLA L1 = PULSE ENGINEERING, INC. #PE-92106 AN30 F47 –12V 1.5A Figure 47. Dual Preregulated Supply (90V AC-130V AC to ±12V) an30fa AN30-30 Application Note 30 2.2k VZ Q1 2N6667 1MHY 28V INPUT 10k IN + 1N4003 LT350A OUTPUT OUT ADJ 4500µF LT1004 1.2V VZ 68pF 15k 2k 10k LT1004 2.5V 1M 28V 240Ω* 15k + 1k 10k LT1018 – *1% FILM RESISTOR 1MHY = DALE TD-5 TYPE AN30 F48 Figure 48. Linear Regulator with Switching Preregulator 9V INPUT L 2N2905 + 1N4148 10k 5V 20mA 2N5434 47µF 390k 1% HP5082-2811 VD = 200mV – 9V 10k 100µA 1 LT1013 8 + + 7 5 330k LT1013 – 4 2 3 120k 1% 9V 6 47k LT1004 1.2V L = DALE TE-3/Q3/TA SHORT CIRCUIT CURRENT = 30mA ≈ 75% EFFICIENCY SWITCHING PREREGULATOR CONTROLS DROP ACROSS FET TO 200mV AN30 F49 Figure 49. Switching Preregulated Linear Regulator (9V to 5V) an30fa AN30-31 Application Note 30 27k VIN 10V DC TO 20V DC 3V DC UNDER ALL CONDITIONS 2N6667 8V DC 1mH* 1k 1N4003 LT1035 1 VIN VOUT AUX EN GND 5 + 4500µF 4 2 5V 3A OUTPUT + 10µF 3 3.9k 1k 3k 1000pF LT1011 COMPARATOR 8 OUTPUT CONTROL LOGIC 150k + 2 7 – 1 3 5k 4 5k AN30 F50 *DALE TD-5 THIS CIRCUIT IS DESIGNED TO REDUCE POWER DISSIPATION IN THE LT1035 OVER A 90V AC TO 140V AC INPUT RANGE Figure 50. Low Dissipation Regulator (10V-20V to 5V) IRFD9120 +V 6V TO 10V S 100mH DALE TE-5Q4-TA D 5.2V 3 + 1N5817 220µF 680pF 1M* VIN VOUT 2.5V LT1020 REF GND 4 825k* 220k 6 – 74C04 LT1020 COMP + *1% METAL FILM RESISTOR GROUND UNUSED 74C04 INPUTS 9 5VOUT + FB 1M* 0.001µF 10µF 11 1M 200k PREREG TRIM 8 2 909k* 200k OUTPUT TRIM 7 270pF HP5082-2810 AN30 F51 Figure 51. Micropower Post Regulated Switching Regulator (6V-10V to 5V) an30fa AN30-32 Application Note 30 VZ 1MHY † LT1038 OR LT1083 + STANCOR P-8675 1N4003 20Ω 3 110AC 20Ω 1 • • 10000µF LT1004 1.2V 4 LT1004 2.5V T1 VZ 20k 2.7k –15V 2 † 1N4003 + 750Ω* 0V TO 35V 0A TO 10A (7.5A FOR 100µF LT1083) LT1004 1.2V 16k* 1N4003 11k* 1µF 15V + 82k 15V 15V 1k 2 8 + 200k C1 LT1011 10k 3 7 0.1µF 1 – 4 *1% FILM RESISTOR T1 = SPRAGUE 11Z-2003 †SCRs = GE C-220B 1MHY = DALE TD-5 TYPE –15V 15k 15V 100pF 1N4148 15V 2N3904 8 – 7 C2 LT1011 1 3 15V 15V 1 15k 2 10k 8 + A1 LM301A + 4 – 1µF –15V 16k* 11k* –15V AN30 F52 Figure 52. High Current Low Dissipation Preregulated Linear Regulator 7.5V TO 30V VIN 100µF 30k 3.3M 2N3906 SWITCHING REGULATOR OUTPUT 2N3904 TO VREF (PIN4) POST REGULATOR 2N2222 1.8M 2N3904 1M 4mH 10k 1k 3 100k LT1020 COMPARATOR MAINTAINS LOW IQ (< 100µA) FOR ALL INPUT VOLTAGES SWITCHER EFFICIENCY = 85% POST REGULATOR EFFICIENCY = 82% OVERALL EFFICIENCY = 70% SWITCHING REGULATOR OUTPUT = 2.5 × (1 + RA /RB). FOR A CLEAN OUTPUT FROM THE LINEAR REGULATOR SET TO VOUT + 1.2V + 8 30k 7 RA 1.5M VOUT LT1020 VREF 2M – 6 VIN 4 2 + FB VOUT 5V 100mA 22µF 11 0.01µF 220k 220k 2M RB 1M 0.001µF AN30 F53 + 30k 100µF Figure 53. Switching Preregulator for Wide Input Voltage Range (7.5V-30V to 5V) an30fa AN30-33 Application Note 30 2µF VIN FB/SHDN V + 100µF OSC CAP LT1054 VREF GND CAP – 10µF 2µF ) –VOUT VOUT + Figure 54. Basic Voltage Inverter FB/SHDN V + 100µF VIN CAP VOUT VOUT 100µF AN30 F55 VOUT 50mA QX* 100µF + VIN 1N4001 3.5V TO 15V 1N4001 – + + – 2µF 10µF FB/SHDN V + AN30 F56 VIN = 3.5V TO 15V VOUT ≈ 2VIN – (VL + 2VDIODE) VL = LT1054 VOLTAGE LOSS Figure 56. Negative Voltage Doubler + + 100µF RX VIN VIN = –3.5V TO –15V VOUT = 2VIN + (LT1054 VOLTAGE LOSS) + (QX SATURATION VOLTAGE) CAP + OSC LT1054 GND VREF CAP – VOUT AN30 F57 Figure 57. Positive Doubler 1N4001 +VOUT 0.002µF Figure 55. Basic Voltage Inverter/Regulator VOUT + 2µF – )) ) + CAP + OSC LT1054 GND VREF VOUT |VOUT| |VOUT| R2 = +1 = +1 1.21V VREF R1 – 40mV 2 100µF R1 R2 CAP – AN30 F54 + OSC CAP + LT1054 VREF GND + + + + + VIN + FB/SHDN V + 1N4001 + + 10µF 100µF FB/SHDN V + OSC CAP + LT1054 VREF GND –VIN CAP – VOUT AN30 F58 + 2µF Figure 58. Switched Capacitor – VIN to +VOUT Converter an30fa AN30-34 Application Note 30 VIN 3.5 TO 15V + 2.2µF 10µF + 10µF FB/SHDN V + CAP + OSC LT1054 #1 VREF GND CAP + OSC LT1054 #2 VREF GND CAP – 1N4002 VOUT SET + 10µF 10µF R1 40k VOUT 10µF 0.002µF + 100µF VIN = 3.5 TO 15V VOUT MAX ≈ –2VIN + [1054 VOLTAGE LOSS + 2(VDIODE)] 1N4002 + ) CAP – 1N4002 1N4002 R2 500k + HP5082-2810 PIN 2 LT1054 #1 20k VOUT 10µF 1N4002 + + FB/SHDN V + –VOUT IOUT ≅ 100mA MAX AN30 F59 )) ) |VOUT| |VOUT| R2 = +1 = +1 1.21V R1 VREF – 40mV 2 Figure 59. 100mA Regulating Negative Doubler VIN 3.5V TO 15V + + + 10µF 100µF +VOUT – + 10µF FB/SHDN V + OSC CAP + LT1054 VREF GND CAP – + 100µF VOUT + 10µF – 100µF VIN = 3.5V TO 15V +VOUT ≈ 2VIN – (VL + 2VDIODE) –VOUT ≈ –2VIN + (VL + 2VDIODE) VL = LT1054 VOLTAGE LOSS –VOUT + + AN30 F60 = 1N4001 Figure 60. Dual Output Voltage Doubler VIN = 5V + 5µF VOUT ≈ 12V IOUT = 25mA FB/SHDN V + 100µF 10µF + 10µF 2N2219 VOUT 5µF 100µF + CAP – + + OSC CAP + LT1054 #1 VREF GND 1k + 10µF 1N914 TO PIN 4 LT1054 #1 FB/SHDN V + OSC CAP + LT1054 #2 VREF GND CAP – 20k VOUT 100µF VOUT ≈ –12V IOUT = 25mA + + 1N914 AN30 F61 Figure 61. Switched Capacitor Converter (5V to ±12V) an30fa AN30-35 Application Note 30 10µF + + C1 10µF + 5V OSC CAP + LT1054 VREF GND + + CAP – VOUT + 10µF 100µF 10µF 100µF –VOUT + +VOUT FB/SHDN V + 10µF + 10µF AN30 F62 + = 1N4148 + 10µF 10µF Figure 62. Switched Capacitor Charge Pump-Based Voltage Multiplier (5V to ±12V) VIN 3.5V TO 5.5V 1 1N914 2 + 1N914 R1 20k OSC LT1054 GND VREF + 10µF CAP – 1µF + CAP + 5µF R2 125k 0.002µF VOUT + R2 125k 7 LTC1044 3 6 4 5 + FB/SHDN 1N914 V+ 8 100µF 1µF 3k VOUT = 5V + 20k – VIN = 3.5V TO 5.5V VOUT = 5V IOUT(MAX) = 50mA 2N2219 1N914 1N5817 AN30 F63 Figure 63. Regulator (3.5V to 5V) 5µF 12V + 10µF + ) CAP – VOUT )) ) |VOUT| |VOUT| R2 = +1 = +1 1.21V R1 VREF – 40mV 2 R1 39.2k + 10µF R2 200k 0.002µF 10Ω 1/2W CAP + OSC LT1054 #2 GND VREF CAP – 20k VOUT AN30 F64 200µF + 10Ω 1/2W CAP + OSC LT1054 #1 GND VREF HP5082-2810 FB/SHDN V + FB/SHDN V + VOUT = –5V IOUT = 0mA to 200mA Figure 64. Regulating 200mA Converter (12V to – 5V) an30fa AN30-36 Application Note 30 VIN = 5V 15V + VOUT 8V 50mA 11 5µF 20k 16 DIGITAL INPUT AD558 OSC CAP + LT1054 GND VREF 5.5k 10k 13 14 20k 10µF 1N5817 0.03µF + 100µF 10k CAP – VOUT 10k 12 2.5k CAP + OSC LT1054 GND VREF 5V – 2µF FB/SHDN V + + LT1004-2.5 2.5V FB/SHDN V + + 10µF + 50k 1N5817 + LT1006 AN30 F65 CAP – VOUT VOUT = –VIN (PROGRAMMED) 100µF AN30 F66 0.1µF + Figure 65. Digitally Programmable Negative Supply Figure 66. Positive Doubler with Regulation (5V to 8V) VIN 3.5V TO 15V FB/SHDN V + + 2µF OSC CAP + LT1054 VREF GND CAP – + 10µF R1, 20k VOUT 1N4001 R2 1M 100µF 0.002µF 1N4001 CAP + –VOUT ) )) ) + 100µF GND AN30 F67 CAP – |VOUT| |VOUT| R2 = +1 = +1 1.21V R1 VREF – 40mV 2 V+ 1.5V TO 9V OSC LTC1044 10µF + VIN = 3.5V TO 15V VOUT(MAX) ≈ –2VIN + (VL + 2VDIODE) VL = LT1054 VOLTAGE LOSS V+ BOOST LV REQUIRED FOR V + < 3V VOUT = –V+ VOUT 10µF TMIN ≤ TA ≤ TMAX + 10µF + + AN30 F68 Figure 67. Negative Doubler with Regulator Figure 68. Negative Voltage Converter VIN 1.5V TO 9V 1N914 IOUT R1 200Ω CAP + + C1 10µF V+ BOOST OSC + C2 10µF 2VIN 3V TO 18V LTC1044 GND CAP – LV VOUT FOR 1M REQUIRED V + < 3V AN30 F69 Figure 69. Voltage Doubler an30fa AN30-37 Application Note 30 IS IS V CAP + + + C1 3V GND 10µF 1.2V CELL ×2 OSC LTC1044 CMOS LOGIC NETWORK LV CAP – VOUT CAP + + C1 GND 10µF CAP – OSC CMOS LOGIC NETWORK LV VOUT + SUPPLY CURRENT IS ≈ 3µA Figure 70. Voltage Doubler VOUT LTC1044 C2 10µF AN30 F70 4.8V V+ BOOST C2 10µF + BOOST VOUT 6V + AN30 F71 Figure 71. Generating CMOS Logic Supply from 2 Mercury Batteries (2.4V to 4.8V) V+ CAP + + C1 CAP + OSC + C1 LTC1044 GND 10µF CAP – REQUIRED FOR VB < 6V LV VOUT 3V ≤ VB ≤ 18V + C1 LV CAP – 10µF LV GND CAP – VOUT OSC LTC1044 VOUT = –V+ VOUT C2 10µF * *THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044s TO MINIMIZE RIPPLE + AN30 F72 Figure 72. Battery Splitter (9V to ±4.5V) FOR VOUT = –3V + V+ 10µF + BOOST CAP + OSC LTC1044 1 GND LV CAP – VOUT C2 20µF AN30 F73 1/4 CD4077 Figure 73. Paralleling for Lower Output Resistance V+ + CAP + OSC GND 10µF –VB/2 –4.5V V+ BOOST LTC1044 OUTPUT COMMON 10µF V+ BOOST + VB 9V +VB/2 4.5V V+ BOOST –V + BOOST FOR VOUT = –2V + V+ CAP + OSC LTC1044 2 GND LV CAP – VOUT VOUT 10µF 10µF + + AN30 F74 Figure 74. Stacking for Higher Voltage an30fa AN30-38 Application Note 30 1N914 V + = 5V + 200Ω V+ BOOST + 2V + 10µF CAP – OSC CAP LTC1044 2 LV GND CAP – OSC CAP LTC1044 1 LV GND + VOUT + 200Ω 10V V+ BOOST 10µF 1N914 + 10µF 1M* VOUT + 10µF 1M* VOUT FOR VOUT = 3V (15V) FOR VOUT = 4V (20V) *REQUIRED FOR V + < 3V AN30 F75 Figure 75. Voltage Tripler/Quadrupler 3V 1N914 100Ω V+ BOOST CAP + + OSC 5V OUTPUT C2 100µF LTC1044 + GND C1 10µF LV 4.8M 1M CAP – VOUT 7 LM10 + 2N3906 1 2N3904 REF AMP + 200mV 2 – EVEREADY EXP-30 3V 8 – 1k 1k 6 OP AMP 3 + 330k 4 1N914 150k AN30 F76 100k VOUT ADJUST Figure 76. Regulated Voltage Up Converter (3V to 5V) 200k 6 LM10 2 – 1 8 V+ OSC LV VOUT LTC1044 200k 1 OUTPUT + 100µF 4 50k 50k VOUT ADJ BOOST CAP + GND CAP – 10µF + 2 C2 1µF + 3 4 –VOUT 39k C1– +VOUT C2+ C1+ LT1026 C2– –VOUT VIN GND 8 + 7 6 +VOUT 1µF VIN 5 1µF 0.1µF + AN30 F77 10µF Figure 77. Regulated Negative Voltage Converter + 39k 7 + + 3 C1 1µF 8.2k 9V AN30 F78 Figure 78. Dual Output Switched Capacitor Voltage Generator an30fa AN30-39 Application Note 30 ≈11V NO LOAD 1µF + 1 + 1µF 2 3 8 8 + 7 LT1026 4 6 9 3 GND VIN –IN 2 OUT 7VOUT 20mA 500k* LT1020 1µF 5 6VIN COMP PNP +IN 10k 7 5 0.002µF 1µF 0.001µF 1M* COMP NPN REF OUT 4 360k* 0.001µF + 11 FB 100µF 270k* 6 + 100k 10µF + AN30 F79 –7VOUT 20mA VN2222 100k ≈ –11V NO LOAD *1% METAL FILM RESISTOR Figure 79. Switched Capacitor-Based Converter (6V to ±7V) 12VIN 12VIN 22k 2k 8 + 1 LTC1043 7 – C1 LT1011 6 LT1004 1.2V REFERENCE 4 8 12VIN 100pF S 1k Q1 11 D S Q3 D 470µF + 1k 470µF 12 38k VOUT 5V 1A 12k 12V 13 14 6 5 12V S Q2 D 1k D Q4 2 S 1k 3 18 12VIN 15 ALL DIODES ARE 1N4148 Q1, Q2, Q3 = IRF9531 P-CHANNEL Q4 = IRF533 N-CHANNEL 17 16 4 12V 180pF AN30 F80 Figure 80. High Power Switched Capacitor Converter (12V to 5V) an30fa AN30-40 Application Note 30 5V 14 LT1032 2 3 5 6 1N4148 470µF 1N4148 + + VIN 1M VOUT 13.7V AT NO LOAD 12V AT 10mA 51k 470µF fCLK = 1kHz 470µF 1N4148 8 9 + 470µF 8 –VOUT –13.7V AT NO LOAD –12V AT 10mA 3 – 5 0.0033µF + 7 6 + 11 12 VOUT (NL) ≅ – (VIN – 1V) VOUT (5mA) ≅ – (VIN – 3V) IQ ≅ 300µA 2N3904 22k 9 1N4148 + 1M 10µF –VOUT 51k 1 1N5819 OR EQUIVALENT AN30 F81 –5V + 20µF AN30 F82 Figure 81. Voltage Multiplier (±5V to ±15V) Figure 82. Charge-Pump Negative Voltage Generator VIN 1M 1N5819 OR EQUIVALENT 51k VOUT + 8 20µF 3 – 5 0.0033µF 7 2N3904 22k 6 + VOUT (NL) ≅ 2VIN – 1V VOUT (5mA) ≅ 2VIN – 3V IQ ≅ 300µA 10µF + 9 1M AN30 F83 51k Figure 83. Charge Pump Voltage Doubler VIN ≥ 6V 1 2 + 8 8 3 3 VIN –IN 7 LT1054 6 COMP PNP +IN 10k 4 REF OUT 7 5 0.002µF 100µF OUT 2 5VOUT 100mA 500k* LT1020 5 10µF 9 GND 0.001µF 1M* COMP NPN 4 499k* 6 100k FB 0.001µF + 11 10µF 500k* + 10µF + 5V 0V AN30 F84 –5VOUT 75mA VN2222 100k *1% METAL FILM RESISTOR Figure 84. High Current Switched Capacitor Converter (6V to ±5V) an30fa AN30-41 Application Note 30 MUR120 12VIN + 4 0.2µF 22µF L1 + 8 2k 2W 12V LT1086-12 •7 2• + 470µF 10µF 9 MUR120 LT1086-12 3 MUR120 • 10 + + 470µF 1• VIN 10µF 11 –12V VSW MUR120 LT1071 VOUT 5V 1A + •5 2700µF FB GND VC 1µF 3.01k* 6 1k + *1% FILM RESISTOR L1 = PULSE ENGINEERING, INC #PE-65108 PULSE ENGINEERING, INC PO BOX 12235 SAN DIEGO, CA 92112 (619) 268-2400 1k* AN30 F85 Figure 85. Multioutput Flyback Converter (12V to 5V, ±12V) MUR120 L1 OFF 12V LT1086-12 •7 ON + 8 + 10µF 470µF 9 MUR120 12VIN LT1086-12 + • 10 4 0.2µF 22µF 2k 2W 2 • 11 + OPTIONAL FOR LOWEST IQ CURRENT + 470µF 10µF –12V MBR360 3 MUR120 1• VIN + •5 C1 2700µF R3 1M R1 1M* 6 VSW 10pF C3 0.005µF LT1071 12VIN NC VC C2 47µF A1 1/2 LT1017 R6 200Ω R2* 453k + + 74C04 (5/6) 74C04 (1/6) – FB GND VOUT 5V R7 1A 10k 1N4148 1N4148 R4 10k R5 180k 12VIN *1% FILM RESISTOR L1 = PULSE ENGINEERING, INC #PE-65108 LT1004 1.2V AN30 F86 Figure 86. Multioutput Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) an30fa AN30-42 Application Note 30 5V 10µF L1 150µH + MUR120 VIN 1N5919A* 5.6V VSW LT1072 FB VC GND 270k VP-P COMMAND C1 1µF Q1 2N3904 + R1** VOUT = 12V 10.7k, 0.1% VOUT = 12.75V 11.5k, 0.1% 100µF R2** 1.24k 0.1% R3 1k + 120k VP-P OUTPUT 200mA MAX *ZENER DIODE OPTIONAL **IRC #CM55-T13 L1 = PULSE ENGINEERING, INC #PE-52645 C2 1µF AN30 F87 Figure 87. Basic Flash EPROM VP-P Pulse Generator (5V to 12.75V or 12V) 5V 10µF L1 150µH + MUR120 VIN VSW + 0.68µF LT1072 GND VP-P LOCK 270k Q1 2N3904 120k FB VC 1.2k 1k ≈17V + 1N914 1µF 10k VP-P COMMAND 200µF 16k 74C04 OR EQUIVALENT + LT1004 1.2V A1 LT1006 VP-P OUTPUT 150mA MAX A2 LT1010 – 680pF AN30 F87 1N914 *IRC #CM55-T13 L1 = PULSE ENGINEERING, INC #PE-52645 1.24k* 0.1% VOUT = 12V* 10.7k, 0.1% VOUT = 12.75V* 11.5k, 0.1% Figure 88. High Repetition Rate VP-P Pulse Generator (5V to 12.75V or 12V) an30fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. AN30-43 INPUT 15V TO 35V + AN30-44 (408) 432-1900 ● FAX: (408) 434-0507 ● 20k LT1004-2.5 50k 1pF 0.1µF 5.1k Linear Technology Corporation www.linear.com 3.6k 100Ω E2 GND 2N2222 1N4148 VSW 1µF 1k VFB VC LT1072CN8 VIN E1 1k* 1.4k* + 200Ω 2µF 4.3K 390Ω 1N4148 VN2222LL 20Ω 20Ω 2N3906 Figure 89. High Current Positive Buck with Bootstrapped NMOS Gate Drive (15V-35V to 5V) 7.5k* 2N2222 1k* LT317AH 1µF 3300µF MBR1535 (HEAT SINK) IRFZ44† (HEAT SINK) AN30 F89 1µF 3.01k* + *1% FILM RESISTORS **VBE MATCHING OF 20mV AT 240µA † INTERNATIONAL RECTIFIER L1 = PULSE ENGINEERING, INC #PE-92117 100µF 2N3906** 2N3906** 0.018Ω VOUT 5V 10A L1 55µH Application Note 30 LT/TP 0403 REV A • PRINTED IN USA an30fa 1630 McCarthy Blvd., Milpitas, CA 95035-7417 LINEAR TECHNOLOGY CORPORATION 1989