Application Note 30 AN30-1 an30fa February 1989 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. Switching Regulator Circuit Collection John Seago 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. FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE Battery 2A Converter with 150μ A Quiescent Current (6V to 12V) Figure 5 6 AN29, Page 9 200mA Output Converter (1.5V to 5V) Figure 6 7 AN29, Page 15 Up Converter (6V to 15V) Figure 7 7 AN8, Page 9/LT1013 DS Regulated Up Converter (5V to 10V) Figure 8 8 LT1018 DS Boost Converter (1.5V to 5V) Figure 9 8 AN15, Page 7/LT1018 DS Up Converter (1.5V to 5V) Figure 10 8 LM10 DS Single Cell Up Converter (1.5V to 5V) Figure 11 8 AN8, Page 8 The Low Quiescent Current Loop Applied to a Buck Converter (8V-16V to 5V) Figure 18 14 AN29, Page 12 Low Power Switching Regulator (9V to 5V) Figure 23 17 AN8, Page 4/LT1013 DS Micropower Switching Regulator (5.8V-10V to 5V) Figure 24 17 AN23, Page 15 Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) Figure 30 20 AN29, Page 13 800μ A Output Converter (1.5V to 5V) Figure 40 26 AN29, Page 14 Switching Preregulated Linear Regulator (9V to 5V) Figure 49 31 AN8, Page 5/LT1013 DS Micropower Post Regulated Switching Regulator (6V-10V to 5V) Figure 51 32 AN23, Page 16 Generating CMOS Logic Supply from 2 Mercury Batteries (2.4V to 4.8V) Figure 71 38 LTC1044 DS Battery Splitter (9V to ±4.5V) Figure 72 38 AN8, Page 2/LTC1044 DS Regulated Voltage Up Converter Figure 76 39 AN8, Page 7/LTC1044 DS Boost Boost Converter (5V to 12V) Figure 1 5 AN19, Page 13/AN25, Page 2/LT1070 DS Voltage Boosted Boost Converter (15V to 100V) Figure 2 5 AN19, Page 37/LT1070 DS Current Boosted Boost Converter (16V-24V to 28V) Figure 3 5 AN19, Page 40/LT1070 DS Negative Boost Regulator (–15V to –28V) Figure 4 5 AN19, Page 38/LT1070 DS 2A Converter with 150μ A Quiescent Current (4.5V-8V to 12V) Figure 5 6 AN29, Page 9 200mA Output Converter (1.5V to 5V) Figure 6 7 AN29, Page 15 Up Converter (6V to 15V) Figure 7 7 AN8, Page 9/LT1013 DS Regulated Up Converter (5V to 10V) Figure 8 8 LT1018 DS Boost Converter (1.5V to 5V) Figure 9 8 AN15, Page 7/LT1018 DS Up Converter (1.5V to 5V) Figure 10 8 LM10 DS DRAWING INDEX
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Application Note 30
AN30-1
an30fa
February 1989
Switching regulators are of universal interest. LinearTechnology has made a major effort to address this topic.A catalog of circuits has been compiled so that a designengineer can swiftly determine which converter type isbest. This catalog serves as a visual index to be browsedthrough for a specific or general interest.
Switching Regulator Circuit Collection
John Seago
The catalog is organized so that converter topologies canbe easily found. There are 12 basic circuit categories:Battery, Boost, Buck, Buck-Boost, Flyback, Forward, HighVoltage, Multioutput, Off Line, Preregulator, SwitchedCapacitor and Telecom. Additional circuit information canbe located in the references listed in the index. Thereference works as follows, i.e., AN8, Page 2 = ApplicationNote 8, Page 2; LTC1044 DS = LTC1044 data sheet;DN17 = Design Note 17.
FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE
Battery2A Converter with 150µA Quiescent Current (6V to 12V) Figure 5 6 AN29, Page 9200mA Output Converter (1.5V to 5V) Figure 6 7 AN29, Page 15Up Converter (6V to 15V) Figure 7 7 AN8, Page 9/LT1013 DSRegulated Up Converter (5V to 10V) Figure 8 8 LT1018 DSBoost Converter (1.5V to 5V) Figure 9 8 AN15, Page 7/LT1018 DSUp Converter (1.5V to 5V) Figure 10 8 LM10 DSSingle Cell Up Converter (1.5V to 5V) Figure 11 8 AN8, Page 8The Low Quiescent Current Loop Applied to a Buck Converter (8V-16V to 5V) Figure 18 14 AN29, Page 12Low Power Switching Regulator (9V to 5V) Figure 23 17 AN8, Page 4/LT1013 DSMicropower Switching Regulator (5.8V-10V to 5V) Figure 24 17 AN23, Page 15Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V) Figure 30 20 AN29, Page 13800µA Output Converter (1.5V to 5V) Figure 40 26 AN29, Page 14Switching Preregulated Linear Regulator (9V to 5V) Figure 49 31 AN8, Page 5/LT1013 DSMicropower Post Regulated Switching Regulator (6V-10V to 5V) Figure 51 32 AN23, Page 16Generating CMOS Logic Supply from 2 Mercury Batteries (2.4V to 4.8V) Figure 71 38 LTC1044 DSBattery Splitter (9V to ±4.5V) Figure 72 38 AN8, Page 2/LTC1044 DSRegulated Voltage Up Converter Figure 76 39 AN8, Page 7/LTC1044 DS
BoostBoost Converter (5V to 12V) Figure 1 5 AN19, Page 13/AN25, Page 2/LT1070 DSVoltage Boosted Boost Converter (15V to 100V) Figure 2 5 AN19, Page 37/LT1070 DSCurrent Boosted Boost Converter (16V-24V to 28V) Figure 3 5 AN19, Page 40/LT1070 DSNegative Boost Regulator (–15V to –28V) Figure 4 5 AN19, Page 38/LT1070 DS2A Converter with 150µA Quiescent Current (4.5V-8V to 12V) Figure 5 6 AN29, Page 9200mA Output Converter (1.5V to 5V) Figure 6 7 AN29, Page 15Up Converter (6V to 15V) Figure 7 7 AN8, Page 9/LT1013 DSRegulated Up Converter (5V to 10V) Figure 8 8 LT1018 DSBoost Converter (1.5V to 5V) Figure 9 8 AN15, Page 7/LT1018 DSUp Converter (1.5V to 5V) Figure 10 8 LM10 DS
DRAWING INDEX
Application Note 30
AN30-2
an30fa
FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE
Boost (Continued)Single Cell Up Converter (1.5V to 5V) Figure 11 8 AN8, Page 8Single Inductor, Dual Polarity Regulator (6V to ±15V) Figure 12 9 AN8, Page 10/LT1013 DSSingle Inductor Regulated Converter (5V to ±15V) Figure 13 10 AN29, Page 6Low Noise Converter (5V to ±15V) Figure 14 11 AN29, Page 2Ultralow Noise Sine Wave Drive Converter (5V to ±15V) Figure 15 12 AN29, Page 4Single Inductor, Dual Output Converter (5V to ±15V) Figure 16 13Basic Flash EPROM VPP Pulse Generator (5V to 12.75V or 12V) Figure 87 43 DN17High Repetition Rate VPP Pulse Generator (5V to 12.75V or 12V) Figure 88 43 DN17
BuckPositive Buck Converter (15V-35V to 5V) Figure 17 13 AN29, Page 23The Low Quiescent Current Loop Applied to a Buck Converter (8V-16V to 5V) Figure 18 14 AN29, Page 12Positive Buck Converter (7V-15V to 5V) Figure 19 15Positive Buck Converter Figure 20 15 AN19, Page 23Negative Buck Converter (–20V to –5.25V) Figure 21 16 AN19, Page 17/LT1070 DS90% Efficiency Positive Buck Converter with Synchronous Switch (9.5V-14V to 5V) Figure 22 16 AN29, Page 18Low Power Switching Regulator (9V to 5V) Figure 23 17 AN8, Page 4/LT1013 DSMicropower Switching Regulator (5.8V-10V to 5V) Figure 24 17 AN23, Page 155V, 1A Regulator (8V-30V to 5V) Figure 25 18 LT3524 DSHigh Power Linear Regulator with Switching Preregulator Figure 46 30 AN29, Page 25/LT1083 DSLinear Regulator with Switching Preregulator Figure 48 31 AN2, Page 3Switching Preregulated Linear Regulator (9V to 5V) Figure 49 31 AN8, Page 5/LT1013 DSLow Dissipation Regulator (10V-20V to 5V) Figure 50 32 LT1035 DSMicropower Post Regulated Switching Regulator (6V-10V to 5V) Figure 51 32 AN23, Page 16High Current Low Dissipation Preregulated Linear Regulator Figure 52 33 AN2, Page 4/LT1038 DSSwitching Preregulator for Wide Input Voltage Range (7.5V-30V to 5V) Figure 53 33 LT1020 DSHigh Current Positive Buck with Bootstrapped NMOS Gate Drive (15V-35V to 5V) Figure 89 44
REQUIRED IF INPUT LEADS ≥ 2"PULSE ENGINEERING 92113
†TO AVOID START-UP 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 0.3µFAND REDUCE R6 TO 100Ω.
VOUT–12V2A
R35k
R21.24k
C10.1µF
C5*100µF
C32µF
+C4
5µF
+C1†
1000µF
L1**200µH
VSW
VC
VIN
LT1070
R5†
470Ω1W
D3†
1N4001
R110.7k
R447Ω
D21N914
D1
GND FB
Figure 28. Positive to Negative Buck-Boost Converter (10V-30V to –12V)
Application Note 30
AN30-20
an30fa
AN30 F29*REQUIRED IF INPUT LEADS ≥ 2"
a
b
VSNUB
C20.15µF
R31.5k
R13.74k
R21.24k
C4*100µF
VIN20V TO 30V
VOUT5V6A
VSW
VC
VIN
LT1070
GNDFB
C30.47µF
C12000µF
D2
D1
R41 N
•
•
+
+
PRIMARY FLYBACK VOLTAGE =
LT1070/LT1071 SWITCH VOLTAGEAREA “a” = AREA “b” TO MAINTAINZERO DC VOLTS ACROSS PRIMARY
SECONDARY VOLTAGEAREA “c” = AREA “d” TO MAINTAINZERO DC VOLTS ACROSS SECONDARY
PRIMARY CURRENT
VOUT + VFN
0V
VIN
CLAMP TURN-ONSPIKE
C4200µF
L210µH
OPTIONALFILTER
c
∆I
d
VOUT + VF
(N)(VIN)
IPRI
0V
0
LT1070 SWITCH CURRENT
SNUBBER DIODE CURRENT
IPRI
IPRI
t = (IPRI)(LL)
VSNUB
SECONDARY CURRENT
IPRI N
0
0
N = 1/3
Figure 29. Flyback Converter (20V-30V to 5V)
VSW
1
3
6
5C12700µF
VC
VINMUR120
MBR360
LT1071
GNDFB NC
+
–
+
2
4
12VIN
22µF
11
10
MUR120
•
•
•
•470µF
1.2k*
11k*
R31M
R1*1M
R2*453k
R410k
R5180k
LT10041.2V
12VIN
AN30 F30
R710k
C30.005µF
–12V
VOUT5V1A
+10µF
+LT1086
9
8
L17
MUR120
•470µF
1.2k*
11k*
+10µF
12V
+LT1086
R6200Ω
74C04(5)
12VIN
10pF
1N41481N4148
A11/2 LT1017
C247µF
*1% FILM RESISTORL1 = PULSE ENGINEERING, INC #PE-65108
+
0.2µF
2k2W
Figure 30. Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V)
Application Note 30
AN30-21
an30fa
AN30 F31
R41.5k
5k
500Ω
N = 0.875 = 7:8FOR VOUT = 15V
*REQUIRED IF INPUT LEADS ≥ 2"
R2
SECONDARY VOLTAGE0V
VOUT
tOFF tON
≈16V
(N)(VIN)
C20.01µF
C5*100µF
VIN5V
VSW
VC
VIN
LT1070/LT1071
GNDFB
+
C30.47µF N
D11:N
•
•N
+
L110µF
L210µF
15V
COM
+
C4500µF
C1500µF
+
+
C6200µF
C5200µF
OPTIONALOUTPUT FILTER
+–15V
SWITCH VOLTAGE
VF(DIODE FORWARD VOLTAGE)
0V
VIN
VSW
5VVIN = 3.5V TO 35V
OPTIONAL
VC
VIN
LT1070
GNDFB
1k
1µF
*1% FILM RESISTORSL1 = PULSE ENGINEERING, INC #PE-65050 +
3.01k*
1k*
510Ω1W
L1n = 1Q3
2N3906Q22N3906
Q12N2222
3
4MBR360(MOTOROLA)
0.68µF 1k*1%
1k*
1k*1%
3.32k*1%
–5VOUT1A
1000µF
AN30 F32
D1MBR360
•
L1 n = 1
2
1
•
+
+
100µF
1000µF
5VOUT1A
3
VIN
VSW
FB
n = 1
4
L12
MBR360
1•
Figure 31. Totally Isolated Converter (5V to ±15V)
FB12.4k, 1%(IDEAL VALUE—PAD ASREQUIRED FOR 1000VOUT)
+
2µFAN30 F42
Figure 41. Forward Converter (20V-30V to 5V)
Figure 42. Nonisolated Converter (15V to 1000V)
Application Note 30
AN30-28
an30fa
VSWVIN
15VIN
MUR120
3L1
1
7 0.1µF2000V 2.2M
D
S
0.1µF
Q1VN2222
8
1k 0.47µF
LT1072
GNDVC
FBNC
10M**1%
1000VOUT5W
200k
LT10041.2V
10k
1M
200k*
10k*
5kOUTPUTADJUST
*1% METAL FILM RESISTOR**VICTOREEN MAX-750-22L1 = PULSE ENGINEERING, INC #PE-6197
3.6k
180k
8
4
7
2µF
1k
AN30 F430.68µF
4N46
–
+A1
LT1006
= SEMTECH-FM-50
= INPUT GROUND
= OUTPUT COMMON
+
–
+LT1011
PRIMARY
SECONDARY
PIEZOCERAMICTRANSFORMER
15V
1N4148
Q12N3904 *1% METAL FILM RESISTOR
PIEZOCERAMIC TRANSFORMERSAVAILABLE FROM CHANNELINDUSTRIES, INC SANTA BARBARA, CA
1N4148
15V
100Ω
680Ω
2k
10µF +100µF
10VFLOATINGOUTPUT
FLOATINGOUTPUTCOMMON
2k
470pF
0.001µF
0.002µF
1k15V
VOUT3 2
9
11FB
VIN
LT1020
GND500k*
1.5M*
Figure 43. Isolated Output Converter (15V to 1000V)
Figure 44. Converter with 20,000V Isolation (15V to 10V)
Application Note 30
AN30-29
an30fa
+
+
V IN
V SW
1N30
26A
18V
FB
GND
LT10
71
V C
MUR
120
Q5*
WIN
DING
S FO
ROP
TION
AL±1
2V D
COU
TPUT
S
4k10
W0.
22µF
250V
50Ω
MUR
860
PULS
EEN
GINE
ERIN
G#P
E-64
780
DANG
ER! L
ETHA
L PO
TENT
IALS
PRE
SENT
IN S
CREE
NED
AREA
! DO
NOT
CONN
ECT
GROU
NDED
TES
T EQ
UIPM
ENT
4µH
PULS
EEN
GINE
ERIN
G#5
2901
GD
13A
1N58
31
OPTI
ONAL
B 7 9 5
6
12
MUR
120
S
•
• •
220k
*47
k1W
470µ
F25
0V
*1%
MET
AL F
ILM
RES
ISTO
R**
QLA3
02V0
10J2
L (M
ALLO
RY)
Q5 =
MTH
7N50
3k 22k
100Ω
100Ω
10µF
0.01
µF
50pF
Q64N
2882
0Ω
47
22k
0.3Ω
1.24
k*
220k
47k
47k
1/2W47
k1/
2W
2k15
k
Q4
Q3
Q2
NC 47k
36k
LT10
041.
2V0.
47µF
10k
2k
20Ω
AN30
F451µ
F
4.3M
Q1
20µF
90V
ACTO
140V
AC
INPU
T
R T
2A S
LOW
BLOW
+
1N40
05×4
–+
22µF
+
+
5V OUT
50µF
SPRA
GUE
TE-1
307
+
3000
µF**
100Ω
1/2W
3.8k
*
1.2k
*+
A1LT
1006
R T
= 2N
3904
= 2N
3906
= 1N
4148
= V1
50LA
20 (G
E)
= D5
04CS
(MID
WES
T
COM
PONE
NTS)
Figu
re 4
5. 1
00W
Off
Line
Sw
itchi
ng R
egul
ator
DA
NGER
! Let
hal P
oten
tials
Pre
sent
Application Note 30
AN30-30
an30fa
+
–
+
VIN28V
28V
470Ω240Ω
2k
28V
4N28
1N914
1N914
LT1011
10k
10k
10k
1k1M
MR1122
1mH
10,000µF
VOUTLT1083 OUTIN
ADJ
AN30 F46
12V1.5A
–12V1.5A
124Ω*
LT1086
ADJ
IN OUT
AN30 F47
1.07k*
100µFD11N4002
2.4k
30k
20k*
LT1004-2.5
30.1k*28
7
4
3
510k
1000µF
L1285µH
1k
MBR360HEAT SINK2N6667
DARLINGTON
HEAT SINK2N6667
DARLINGTON
10k
–
+LT1011
4700µFMDA201
+
–
124Ω*
LT1086
ADJ
IN OUT
1.07k*
100µFD21N4002
2.4k
30k
20k*
LT1004-2.5
30.1k*28
7
4
3
510k
1000µF
L1285µH
1k
MBR360
130VACTO 90VAC
STANCORP-8685
10k
–
+LT1011
4700µF
*1% FILM RESISTORS MDA = MOTOROLA L1 = PULSE ENGINEERING, INC. #PE-92106
MDA201
+
–
Q1
Q2
+
+
++
+
+
Figure 46. High Power Linear Regulator with Switching Preregulator
Figure 47. Dual Preregulated Supply (90V AC-130V AC to ±12V)
Application Note 30
AN30-31
an30fa
–
+
Q12N6667
1N4003
*1% FILM RESISTOR1MHY = DALE TD-5 TYPE
4500µF
LT10041.2V
240Ω*
2k
1MHY
10k
15k
10k
28VINPUT +
VZ
15k
OUTPUT
10k
AN30 F48
LT10042.5V
VZ68pF
1M
2.2k
1k
28V
LT1018
IN OUTLT350AADJ
Figure 48. Linear Regulator with Switching Preregulator
–
+
LT10131
2
3
330k9V
LT10041.2V
120k1%
AN30 F49
390k1%
5V20mA2N5434
+
–
LT10137
5
6
HP5082-2811
100µA8
4
9V
47k
47µF1N4148
L
10k
10k
2N2905
L = DALE TE-3/Q3/TASHORT CIRCUIT CURRENT = 30mA ≈ 75% EFFICIENCYSWITCHING PREREGULATOR CONTROLS DROP ACROSS FET TO 200mV
9V INPUT
VD = 200mV
+
Figure 49. Switching Preregulated Linear Regulator (9V to 5V)
Application Note 30
AN30-32
an30fa
+
–
+
LT1011COMPARATOR
28
150k
5k 5k
AN30 F50
1k 3k
1k
1mH*8V DC
5 1
1N4003
*DALE TD-5 THIS CIRCUIT IS DESIGNED TO REDUCE POWER DISSIPATION IN THE LT1035 OVER A 90V AC TO 140V AC INPUT RANGE
4500µF+
10µF
OUTPUTCONTROL
LOGIC
5V3AOUTPUT
4 2 3
3.9k
27k
1000pF
7
31
4
2N6667VIN
10V DC TO20V DC
VIN VOUTAUX EN
LT1035
GND
3V DC UNDERALL CONDITIONS
Figure 50. Low Dissipation Regulator (10V-20V to 5V)
+
–
+
VIN
4 9 11
0.001µF680pF
6
8
7
10µF
5VOUT
1M*1M*
909k*
200kOUTPUTTRIM
235.2VVOUT
LT1020GND
2.5VREF FB
825k*
270pF
1M
200kPREREGTRIM
HP5082-2810
AN30 F51
+220µF1N5817
DS
100mHDALE TE-5Q4-TA
IRFD9120
+V6V TO 10V
LT1020COMP
220k
*1% METAL FILM RESISTORGROUND UNUSED 74C04 INPUTS
74C04
Figure 51. Micropower Post Regulated Switching Regulator (6V-10V to 5V)
Application Note 30
AN30-33
an30fa
+
–
+
–
+
–
+
C1LT1011
*1% FILM RESISTORT1 = SPRAGUE 11Z-2003†SCRs = GE C-220B1MHY = DALE TD-5 TYPE
C2LT1011
A1LM301A
15V
3 4
1N4003 10000µF LT10041.2V
LT10042.5V
1MHY
T1
1 2
15V
82
3
83
2
7
1 0.1µF
200k
16k*
750Ω*
LT10041.2V
20k2.7k
–15V
100µF
0V TO 35V0A TO 10A(7.5A FOR LT1083)
11k*
1
7
4
4
–15V15k
10k15k
15V
1N4148
–15V–15V
15V
15V
100pF
15V2N3904
1µF
81
1k
1N40031N4003
82k
10k
1µF
20Ω
110AC
STANCORP-8675
20Ω
†
†
15V
••
+
VZ
VZ
LT1038 ORLT1083 +
16k*
11k*
AN30 F52
Figure 52. High Current Low Dissipation Preregulated Linear Regulator
–
+
+22µF
0.01µF
POST REGULATOR
2
11
3
4
VIN VOUT
FB
VOUT5V100mA
LT1020
AN30 F53
MAINTAINS LOW IQ (< 100µA)FOR ALL INPUT VOLTAGESSWITCHER EFFICIENCY = 85%POST REGULATOR EFFICIENCY = 82%OVERALL EFFICIENCY = 70%SWITCHING REGULATOR OUTPUT =2.5 × (1 + RA/RB). FOR A CLEAN OUTPUTFROM THE LINEAR REGULATOR SET TO VOUT + 1.2V
VREF
220k
+100µF
LT1020COMPARATOR
VIN7.5V TO 30V
TOVREF
(PIN4)
100µF
1.8M
1M
3.3M 30k
1k
2N3906
100k
10k
2M
RB1M2M
30k
RA1.5M
0.001µF
SWITCHINGREGULATOR
OUTPUT
4mH
30k
220k
8
7
2N3904
2N39042N2222
6
Figure 53. Switching Preregulator for Wide Input Voltage Range (7.5V-30V to 5V)
Application Note 30
AN30-34
an30fa
100µF
VIN
–VOUT
AN30 F54
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
2µF
100µF
+
+
+
0.002µF
R210µF
100µF
2µF
VOUT
AN30 F55
VIN
R1
R2R1
= =+ 1|VOUT| ))VREF2 – 40mV )) + 1|VOUT|
1.21V
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
+
+
+
2µF 100µF
VIN = –3.5V TO –15VVOUT = 2VIN + (LT1054 VOLTAGE LOSS) + (QX SATURATION VOLTAGE)
VIN
VIN
VOUT
AN30 F56
RX
+
–100µF
+
+
+
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
QX*
1N4001
VIN = 3.5V TO 15VVOUT ≈ 2VIN – (VL + 2VDIODE)VL = LT1054 VOLTAGE LOSS
VIN3.5V TO 15V
AN30 F57
1N4001
VOUT50mA
+
–100µF 2µF10µF
+++
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
1N4001
AN30 F58
1N4001
100µF 10µF
+VOUT
–VIN
2µF
++
+
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
Figure 54. Basic Voltage Inverter Figure 55. Basic Voltage Inverter/Regulator
Figure 56. Negative Voltage Doubler Figure 57. Positive Doubler
Figure 58. Switched Capacitor –VIN to +VOUT Converter
Application Note 30
AN30-35
an30fa
1N4002
HP5082-2810
VIN3.5 TO 15V
20k
1N40020.002µF
AN30 F59
2.2µF
R140k
VOUTSET
PIN 2LT1054 #1
–VOUTIOUT ≅ 100mA MAX
R2500k
1N4002
1N4002
1N4002 VIN = 3.5 TO 15VVOUT MAX ≈ –2VIN + [1054 VOLTAGE LOSS + 2(VDIODE)]
R2R1
= =+ 1|VOUT| ))VREF2 – 40mV )) + 1|VOUT|
1.21V
10µF 10µF
100µF
+
+
+10µF
+10µF
10µF
+
+
+10µF +
LT1054 #1
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
LT1054 #2
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
VIN3.5V TO 15V
–VOUT
AN30 F60
+VOUT
+
–
+
–
= 1N4001
VIN = 3.5V TO 15V+VOUT ≈ 2VIN – (VL + 2VDIODE)–VOUT ≈ –2VIN + (VL + 2VDIODE)VL = LT1054 VOLTAGE LOSS
100µF 10µF
10µF
10µF
100µF
100µF
+ +
+
+
+
+
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
20k
1N9141N914
VIN = 5V
TO PIN 4LT1054 #1
VOUT ≈ –12VIOUT = 25mA
VOUT ≈ 12VIOUT = 25mA
AN30 F61
1k
2N2219
10µF
100µF
10µF
10µF
100µF
5µF100µF
5µF+
+ +
+
+ ++
+
LT1054 #2
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
LT1054 #1
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
Figure 59. 100mA Regulating Negative Doubler
Figure 60. Dual Output Voltage Doubler
Figure 61. Switched Capacitor Converter (5V to ±12V)
Application Note 30
AN30-36
an30fa
5µF
100µF
20k 1N914
R120k
1N914
VIN = 3.5V TO 5.5VVOUT = 5VIOUT(MAX) = 50mA
1N914
1N5817
VIN3.5V TO 5.5V
AN30 F63
LTC1044
1
2
3
4
8
7
6
5
1µF
1µF0.002µF R2
125k 3k
1N914
R2125k
2N2219
VOUT = 5V
+
–
10µF+
+
+
++
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
0.002µF
HP5082-2810
VOUT = –5VIOUT = 0mA to 200mA
12V
R139.2k
R2200k
20k 10Ω1/2W
AN30 F64
10Ω1/2W10µF
5µF
200µF
10µF+
+
+
+
LT1054 #1
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
LT1054 #2
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
R2R1
= =+ 1|VOUT| ))VREF2 – 40mV )) + 1 |VOUT|
1.21V
Figure 62. Switched Capacitor Charge Pump-Based Voltage Multiplier (5V to ±12V)
Figure 63. Regulator (3.5V to 5V)
Figure 64. Regulating 200mA Converter (12V to –5V)
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREFC1
10µF
5V
–VOUT
AN30 F62
VOUT
+
+ +
+
+
+ +
+VOUT
100µF
= 1N4148
10µF
10µF
10µF
10µF
10µF
10µF
+
10µF
100µF+
+
Application Note 30
AN30-37
an30fa
20k
VOUT = –VIN (PROGRAMMED)
20k
15V
LT1004-2.52.5V
AN30 F65
AD55816
11
14
DIGITALINPUT
13 12
10µF
5µF
+
100µF+
+
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
0.03µF
VIN = 5V
50k
1N5817
1N5817
AN30 F66
–
+
10k
10k
10k
5.5k
2.5k
0.1µF
5V
LT1006
100µF
VOUT8V
50mA
2µF10µF
+
+
+LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
Figure 65. Digitally Programmable Negative Supply Figure 66. Positive Doubler with Regulation (5V to 8V)
2µF
VIN3.5V TO 15V
100µF R21M
1N4001 1N4001
AN30 F67
100µF
0.002µF
–VOUT
VIN = 3.5V TO 15VVOUT(MAX) ≈ –2VIN + (VL + 2VDIODE)VL = LT1054 VOLTAGE LOSS
R2R1
= =+ 1|VOUT| ))VREF2 – 40mV )) + 1|VOUT|
1.21V
10µF+
+
+
+
10µF+
LT1054
FB/SHDN
CAP+
GND
CAP –
V+
OSC
VREF
VOUT
R1, 20k
LTC1044
BOOST V+
1.5V TO 9V
VOUT = –V+
REQUIRED FOR V+ < 3V
TMIN ≤ TA ≤ TMAX
CAP+
GND
CAP –
10µF
AN30 F68
V+
OSC
LV10µF
VOUT
+
+
LTC1044
BOOST 2VIN3V TO 18V
REQUIRED FORV+ < 3V
CAP+
GND
CAP –
AN30 F69
V+
OSC
LVC1
10µF
C210µF
1M
IOUTR1
200Ω
1N914
VIN1.5V TO 9V
VOUT
+
+
Figure 67. Negative Doubler with Regulator Figure 68. Negative Voltage Converter
Figure 69. Voltage Doubler
Application Note 30
AN30-38
an30fa
3V+
LTC1044
BOOST VOUT6V
CAP+
GND
CAP –
AN30 F70
V+
OSC
LVC1
10µF
C210µF
IS
VOUT
+
+
CMOSLOGIC
NETWORK
1.2VCELL
×2LTC1044
BOOST VOUT
CAP+
GND
CAP –
AN30 F71
V+
OSC
LVC1
10µF
C210µF
IS 4.8V
SUPPLY CURRENT IS ≈ 3µA
VOUT
+
+
CMOSLOGIC
NETWORK
Figure 70. Voltage Doubler Figure 71. Generating CMOS Logic Supplyfrom 2 Mercury Batteries (2.4V to 4.8V)
VB9V LTC1044
BOOST +VB/24.5V
–VB/2–4.5V
REQUIREDFOR VB < 6V
CAP+
GND
CAP –
AN30 F72
V+
OSC
LVC1
10µF
3V ≤ VB ≤ 18VC210µF
OUTPUTCOMMON
VOUT
+
+
LTC1044
BOOST
CAP+
GND
CAP –
AN30 F73
V+
OSC
LVC1
10µF
C220µF
VOUT = –V+
1/4 CD4077
VOUT
+
+
LTC1044
BOOST
V+
CAP+
GND
CAP –
*THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044s TO MINIMIZE RIPPLE
V+
OSC
LVC1
10µF
VOUT
+
*
Figure 72. Battery Splitter (9V to ±4.5V) Figure 73. Paralleling for Lower Output Resistance
LTC10441
BOOST
CAP+
GND
CAP –
V+
OSC
LV10µF
10µF
–V+VOUT
+
+
LTC10442
BOOST
CAP+
GND
CAP –
V+
OSC
LV
10µF
V+
VOUT
+
10µF
VOUT
AN30 F74
+
FOR VOUT = –2V+FOR VOUT = –3V+
Figure 74. Stacking for Higher Voltage
Application Note 30
AN30-39
an30fa
1M*
AN30 F75
FOR VOUT = 4V(20V)
FOR VOUT = 3V(15V)
LTC10441
BOOST
CAP+
GND
1M*
10µF
*REQUIRED FOR V+ < 3V
10µF
CAP –
V+
OSC
200Ω
V+ = 5V
1N914
2V+
10V 200Ω
LV10µF
VOUT
LTC10442
BOOST
CAP+
GND
CAP –
V+
OSC
LV
VOUT
+
1N914
+
10µF
VOUT
+
+
LTC1044
BOOST
CAP+
GND
2N39042N3906+EVEREADYEXP-30
3V
CAP –
V+100Ω
3V
OSC
LV1M
1
6
7
4.8M
5VOUTPUT
8
2
3
AN30 F76
4
150k
100kVOUT
ADJUST
200mV
LM10
C2100µF
1N914
VOUT
+
C110µF
+
1k
1k
–
+
REF AMP
–
+
OP AMP
1N914
330k
LTC1044
BOOST CAP+ GND
10µF
CAP –
V+
6
100µF
7
8.2k
50kVOUTADJ
3
2 18
4
39k
0.1µF
39k
9V
50k 200k
OSC
200k
LV VOUT+
+
10µF
AN30 F77
OUTPUT
+–
+LM10 C1–
C2+
C2–
–VOUT
8
7
6
5
1
2
3
4
+VOUT
C1+
VIN
GND
LT1026
+
C11µF
VIN
++
+VOUT
1µFC2
1µF
–VOUT
+1µF
AN30 F78
Figure 75. Voltage Tripler/Quadrupler
Figure 76. Regulated Voltage Up Converter (3V to 5V)
Figure 77. Regulated Negative Voltage Converter Figure 78. Dual Output Switched Capacitor Voltage Generator
Application Note 30
AN30-40
an30fa
+
REFOUT
VIN
LT1020
COMPNPN
COMPPNP
+IN
–IN OUT
FB
2
11
6
100k360k*1M*
VN2222
100k
4
5
8
7
39
0.001µF0.002µF
*1% METAL FILM RESISTOR
500k*
270k*
10µF
AN30 F79
+100µF
7VOUT20mA
–7VOUT20mA
0.001µF
GND
≈11V NO LOAD
≈ –11V NO LOAD
10k6VIN
8
7
6
5
1
2
31µF
1µF
1µF
4
+ 1µF+
+
+
LT1026
+
11
12
87
1413
1k
LTC1043
1k
Q1
Q3
S
SD D
470µF 38k
VOUT5V1A
22k2k
100pF
6
41
8LT10041.2VREFERENCE
12VIN12VIN
12k
ALL DIODES ARE 1N4148Q1, Q2, Q3 = IRF9531 P-CHANNELQ4 = IRF533 N-CHANNEL
470µF
12VIN
12VIN
1k
1k
Q4
AN30 F80
S
D
2
3
56
15
17
416
18
Q2S D
12V
12V
12V180pF
–
+
C1LT1011
Figure 79. Switched Capacitor-Based Converter (6V to ±7V)
Figure 80. High Power Switched Capacitor Converter (12V to 5V)
*1% FILM RESISTORL1 = PULSE ENGINEERING, INC #PE-65108
+10µF
R2*453k
C30.005µF
12VIN
R410k
LT10041.2V
R5180k
AN30 F86
–12V
+LT1086-12
MUR120 OFF
ONL1
2
40.2µF
9
8
7
470µF+
10µF
12V
+LT1086-12
MBR360
1N4148 1N4148
6
5 +VOUT5V1A
2k2W
22µF
12VIN +
•
•
•
•
•
–
+C247µF
R6200Ω
+A1
1/2 LT1017
12VIN
10pF
74C04 (1/6)74C04 (5/6)
Figure 85. Multioutput Flyback Converter (12V to 5V, ±12V)
Figure 86. Multioutput Transformer Coupled Low Quiescent Current Converter (12V to 5V, ±12V)
Application Note 30
AN30-43
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 represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.