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LT1026 Voltage Converter
FEATURES
s s s s s s s s
DESCRIPTIO
Generates + and - from Single Input Up to 18V Output Only Needs Four 1F Capacitors No Inductors 10mA Output Current Minimum Operates Down to 4V No Latchup 8-Pin Minidip
The LT (R) 1026 is a switched capacitor voltage doubler and inverter on a single monolithic die. Capable of operating from a 4V to 10V input, it provides 7V to 18V output. Output currents of over 10mA are available. Two charge pumps first double the input voltage then invert the doubled voltage. Manufactured in bipolar technology, the LT1026 is not susceptible to latchup and generates up to 36V. The LT1026 offers a convenient way of generating additional system voltages without using inductors. Powering interface circuits, op amps or data acquisition circuitry off logic supplies is simplified. Other Linear Technology voltage converters such as the low power LTC (R) 1044 CMOS and 100mA bipolar LT1054 are available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
s s s s
Line Drivers Op Amp Suppliers Battery Splitters RS232 Power
TYPICAL APPLICATION
Voltage Doubler and Inverter
C1 1F
10 8 6 C = 1F VIN = 5V TA = 25C
OUTPUT VOLTAGE (V)
1 2 C2 1F -VOUT
C1- C2+ LT1026 C2- -VOUT
+VOUT C1+ VIN GND
8 7 6 5 VIN
4 2 0 -2 -4 -6 -8 -10
+
+VOUT 1F
+
3 4 1F
1026 * TA01
0
U
Output Voltage
5 15 20 10 LOAD CURRENT (mA) 25
LT1026 * TA02
U
U
+
+
1
LT1026 ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................ 10V V + ............................................................................ 20V V - ..........................................................................- 20V Short-Circuit Duration ......................................... 10 sec Operating Temperature Range LT1026C ................................................. 0C to 70C LT1026I .............................................. - 40C to 85C LT1026M .......................................... - 55C to 125C Lead Temperature (Soldering, 10 sec)................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW +VOUT C1- 1 C2+ 2 C2- 3 5 4 -VOUT 8 7 C1 6
+
ORDER PART NUMBER
VIN GND
LT1026CH LT1026MH
H PACKAGE 8-LEAD TO-5 METAL CAN
TJMAX = 150C, JA = 150C/W (H8)
ELECTRICAL CHARACTERISTICS
PARAMETERS Output Voltage CONDITIONS VIN = 4V (Note 1) IL = 0mA IL = 0mA IL = 10mA IL = - 10mA IL = 15mA IL = - 15mA IL = 0mA IL = 0mA IL = 10mA IL = - 10mA IL = 15mA IL = - 15mA IL = 10mA, - 10mA IL = 10mA, - 10mA IL = 0mA IL = 0mA Positive Negative Positive Negative Positive Negative Positive Negative Positive Negative Positive Negative Positive Negative Positive Negative
q q q q q q q q q q q q q q q q q q
VIN = 5V VIN = 10V
VIN = 5V VIN = 10V Supply Current VIN = 4V VIN = 10V
The q denotes specifications which apply over the specified operating temperature range. Loads are applied to individual outputs unless otherwise marked. Note 1: VIN min = - 4.5 for TA 40C
2
U
U
W
WW
U
W
TOP VIEW C1- 1 C2+ 2 8 +VOUT 7 C1+ 6 VIN 5 GND N8 PACKAGE 8-LEAD PLASTIC DIP
ORDER PART NUMBER LT1026CJ8 LT1026CN8 LT1026CS8 LT1026IS8 LT1026MJ8 S8 PART MARKING 1026 1026I
C2- 3 -VOUT 4 J8 PACKAGE 8-LEAD CERAMIC DIP
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 150C/W (J8) TJMAX = 150C, JA = 100C/W (N8) TJMAX = 150C, JA = 150C/W (S8)
MIN 6.5 -6 5.25 - 4.5 6.25 - 5.5 18 - 17.7 16 - 15.3 15.25 - 14.5 6.25 - 5.5 15 - 14.25
TYP 7 - 6.7 5.7 -5 7 - 6.2 18.5 - 18 17.6 - 17 17 - 16.5 7.2 - 6.5 16.8 - 15.75 7 15
MAX
UNITS V V V V V V V V V V V V V V V V
12.5 30
mA mA
LT1026
TYPICAL PERFORMANCE CHARACTERISTICS
Load Regulation (Both Outputs Loaded)
10 8 6 C = 1F VIN = 5V TA = 25C 10 8 6
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
4 2 0 -2 -4 -6 -8 -10 0 5 15 20 10 LOAD CURRENT (mA) 25
4 2 0 -2 -4 -6 -8 -10 0 5 IL = 0 C = 1F VIN = 5V TA = 25C
OUTPUT VOLTAGE (V)
Supply Current
90 75
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
60 45 30 15 0 0
40 30 20 10 0
SUPPLY CURRENT (mA)
C = 22F VIN = 5V TA = 25C BOTH OUTPUTS LOADED
5
10 15 20 OUTPUT CURRENT (mA)
Ripple
60 50 40 30 20 10 0 VIN = 5V IL = 5mV BOTH OUTPUTS
10 8 6
OUTPUT VOLTAGE (V)
RIPPLE (mVP-P)
1.0
2.2
4.7 10 22 47 OUTPUT CAPACITOR (F)
UW
LT1026 * TPC01
Load Regulation for Positive Loading
10 8 6 4 2 0 -2 -4 -6 -8 -10 25
Load Regulation for Negative Loading
IL = 0
C = 1F VIN = 5V TA = 25C
15 20 10 LOAD CURRENT (mA)
0
5
15 20 10 LOAD CURRENT (mA)
25
LT1026 * TPC02
LT1026 * TPC03
Supply Current
60 50 C = 22F VIN = 5V TA = 25C NEGATIVE OUTPUT LOADED 60 50 40 30 20 10 0 0 5 10 15 20 OUTPUT CURRENT (mA) 25
Supply Current
C = 22F VIN = 5V TA = 25C POSITIVE OUTPUT LOADED
25
0
5
10 15 20 OUTPUT CURRENT (mA)
25
LT1026 * TPC04
LT1026 * TPC05
LT1026 * TPC06
Output Voltage vs Temperature
4 2 0 -2 -4 -6 -8 C = 22F VIN = 5V IL = 1mA
100
-10 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
1026 * TPC07
LT1026 * TPC08
3
LT1026
APPLICATIONS INFORMATION
The LT1026 is a nonregulating voltage converter that converts a single input voltage into both a positive and negative output at up to 15mA. A positive input voltage is first doubled and then the doubled voltage is inverted. The voltage output level is dependent on both the input voltage and the output loading. The total output current available depends on the individual loading of the outputs since loading on one output affects the load and the voltage of the other. Only four external components are needed for operation. Two charge pump capacitors and two output storage capacitors. Nominal value for these capacitors is 1F, but the LT1026 will operate (with reduced performance) down to 0.1F. Higher value capacitors (22F) will reduce ripple and slightly lower output impedance. For higher output currents the outputs of several converters may be paralleled with common output capacitors. The substrate diodes are an inherent part of the IC, and must always be reversed biased to isolate the individual transistors. In the LT1026 the substrate is tied to the negative output. If the negative output is not used, such as when only the voltage doubler output is needed, - VOUT must be tied to ground so the substrate diodes are properly biased. The substrate diodes must never become forward biased even during overload conditions. For example, pulling - VOUT positive with respect to ground can forward bias the substrate diodes. Clamping the substrate to ground with an external diode would be needed to ensure proper operation and prevent the substrate from carrying any current. No overload protection is included on the LT1026. Neither output is damaged by momentary shorts, but during sustained shorts the resulting high current flow will overheat the IC.
TYPICAL APPLICATIONS
Positive to Negative Converter
-VOUT 1F 1 2 C1- C2+ LT1026 C2- -VOUT VIN GND +VOUT C1+ 8 7 6 5 VIN NC
+
1F 3 4
4
U
W
+
U
U
U
1026 * TA03
Voltage Doubler
1F
+
1 2 3 4
C1- C2+ LT1026 C2- -VOUT
+VOUT
8
7 C1+ VIN GND 6 5 VIN
+
VOUT 1F
1026 * TA04
LT1026
TYPICAL APPLICATIONS
Standard Configuration Voltage Doubler and Inverter
C1 1F
C2 1F
+
3 4
Parallel Converters for Higher Output Current and Lower Output Impedance
C1 1F C1 1F
1 2 C2 1F
C1- C2+ LT1026 C2- -VOUT
+VOUT
+
3 4
7 C1+ VIN GND 6 5 VIN C2 1F
+
+
U
+
1 2 C2 1F -VOUT
C1- C2+ LT1026 C2- -VOUT
+VOUT C1+ VIN GND
8 7 6 5 VIN
+
+VOUT 1F
+
3 4 1F
1026 * TA05
Voltage Quadrupler
C1 1F
+
1 2
C1- C2+ LT1026 C2- -VOUT
+VOUT C1+ VIN GND
8 7 6 5
+
+VOUT 1F
VIN (FLOATING)
1F
+
1026 * TA06
+
8 1 2 C1- C2+
+
+VOUT 8 7 C1+ LT1026 C2- -VOUT VIN GND 6 5 VIN
+
+VOUT 1F
+
3 4
1026 * TA07
-VOUT
1F
5
LT1026
TYPICAL APPLICATIONS
5V Powered RS232 Line Driver
C1 1F
+
3 4
PACKAGE DESCRIPTION
0.040 (1.016) MAX
SEATING PLANE 0.010 - 0.045* (0.254 - 1.143) 0.016 - 0.021** (0.406 - 0.533)
45TYP 0.028 - 0.034 (0.711 - 0.864)
0.110 - 0.160 (2.794 - 4.064) INSULATING STANDOFF
6
U
U
+
1 2
C1- C2+ LT1026 C2- -VOUT
+VOUT C1+ VIN GND
8 7 6 5 LOGIC LINE 5VIN
+
1F LT1030
+
1026 * TA08
Dimensions in inches (millimeters) unless otherwise noted. H Package 8-Lead TO-5 Metal Can (0.230 PCD)
(LTC DWG # 05-08-1321)
0.335 - 0.370 (8.509 - 9.398) DIA 0.305 - 0.335 (7.747 - 8.509) 0.050 (1.270) MAX GAUGE PLANE 0.165 - 0.185 (4.191 - 4.699) REFERENCE PLANE 0.500 - 0.750 (12.700 - 19.050)
0.027 - 0.045 (0.686 - 1.143) PIN 1
0.230 (5.842) TYP
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND 0.045" BELOW THE REFERENCE PLANE 0.016 - 0.024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610)
H8 (TO-5) 0.230 PCD 1197
LT1026 PACKAGE DESCRIPTION U
Dimensions in inches (millimeters) unless otherwise noted.
J8 Package 8-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
CORNER LEADS OPTION (4 PLCS) 0.405 (10.287) MAX 8 7 6 5
0.005 (0.127) MIN
0.023 - 0.045 (0.584 - 1.143) HALF LEAD OPTION 0.045 - 0.068 (1.143 - 1.727) FULL LEAD OPTION 0.300 BSC (0.762 BSC)
0.025 (0.635) RAD TYP 1 2 3
0.220 - 0.310 (5.588 - 7.874)
4
0.200 (5.080) MAX 0.015 - 0.060 (0.381 - 1.524)
0.008 - 0.018 (0.203 - 0.457)
0 - 15
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
0.045 - 0.068 (1.143 - 1.727) 0.014 - 0.026 (0.360 - 0.660)
0.125 3.175 0.100 0.010 MIN (2.540 0.254)
J8 1197
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.255 0.015* (6.477 0.381)
1 0.300 - 0.325 (7.620 - 8.255)
2
3
4 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076) N8 1197
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
0.100 0.010 (2.540 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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.
7
LT1026
TYPICAL APPLICATION
Regulated Converter
C1 1F
1 2 C2 1F
C1- C2+ LT1026 C2- -VOUT
+VOUT
8
+
3 4 1F
7 C1+ VIN GND 6 5 VIN 4V
PACKAGE DESCRIPTION
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.053 - 0.069 (1.346 - 1.752)
0.016 - 0.050 0.406 - 1.270
0.014 - 0.019 (0.355 - 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
RELATED PARTS
PART NUMBER LTC1517-5 LTC1550/LTC1551 LTC1555/LTC1556 DESCRIPTION Micropower, Regulated 5V In SOT-23 Low Noise, Switched Capacitor Regulator Voltage Inverter SIM Power Supply and Level Translator COMMENTS Ultralow Power: ICC = 6A Typical, Small 5-Pin SOT-23 < 1mVp-p Typical Output Ripple, 900kHz, IOUT = 10mA Step-Up/Step-Down Generates 5V, Input Voltage Range: 2.7V to 10V, > 10kV ESD, Short-Circuit and Overtemp Protection
1026fa LT/TP 0498 REV A 2K * PRINTED IN USA
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
U
+
+
+VOUT 9 1F 8 INPUT - GND VIN OUT LT1020 COMP/PNP INPUT + 7 0.001F 1M 500k 500k -5V REG 10mA
1026 * TA09
3 2 500k 0.001F 5V
5
FB REFOUT 4 COMP/NPN 6
11 500k
+
10F
+
51k
+
10F
2N3904
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 0.004 - 0.010 (0.101 - 0.254) 8 7 6 5
0.050 (1.270) TYP
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
SO8 0996
1
2
3
4
(c) LINEAR TECHNOLOGY CORPORATION 1988

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