LINER LT1026CS8 Voltage converter Datasheet

LT1026
Voltage Converter
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DESCRIPTIO
FEATURES
■
■
■
■
■
■
■
Generates + and – from Single Input
Up to ±18V Output
Only Needs Four 1µF Capacitors
No Inductors
10mA Output Current Minimum
Operates Down to 4V
No Latchup
8-Pin Minidip
The LT ® 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.
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■
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 ® 1044
CMOS and 100mA bipolar LT1054 are available.
APPLICATIONS
■
■
■
■
Line Drivers
Op Amp Suppliers
Battery Splitters
RS232 Power
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Output Voltage
Voltage Doubler and Inverter
C1
1µF
10
C = 1µF
VIN = 5V
TA = 25°C
+
8
C2
1µF
1
C1–
+VOUT
2
C2+
C1+
+
3
4
–VOUT
LT1026
C2–
–VOUT
VIN
GND
8
+
7
6
+VOUT
1µF
VIN
5
OUTPUT VOLTAGE (V)
6
4
2
0
–2
–4
–6
–8
1µF
+
–10
1026 • TA01
0
5
15
20
10
LOAD CURRENT (mA)
25
LT1026 • TA02
1
LT1026
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W W
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................ 10V
V + ............................................................................ 20V
V – ..........................................................................– 20V
Short-Circuit Duration ......................................... 10 sec
Operating Temperature Range
LT1026C ................................................. 0°C to 70°C
LT1026I .............................................. – 40°C to 85°C
LT1026M .......................................... – 55°C to 125°C
Lead Temperature (Soldering, 10 sec)................. 300°C
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W
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PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
+VOUT
C1– 1
8
+
7 C1
C2+ 2
C2– 3
6
5
LT1026CH
LT1026MH
VIN
ORDER PART
NUMBER
TOP VIEW
C1– 1
8 +VOUT
C2+
2
7 C1+
C2– 3
6 VIN
–VOUT 4
5 GND
J8 PACKAGE
8-LEAD CERAMIC DIP
N8 PACKAGE
8-LEAD PLASTIC DIP
LT1026CJ8
LT1026CN8
LT1026CS8
LT1026IS8
LT1026MJ8
GND
4
–VOUT
H PACKAGE
8-LEAD TO-5 METAL CAN
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W (H8)
TJMAX = 150°C, θJA = 150°C/W (J8)
TJMAX = 150°C, θJA = 100°C/W (N8)
TJMAX = 150°C, θJA = 150°C/W (S8)
S8 PART MARKING
1026
1026I
ELECTRICAL CHARACTERISTICS
PARAMETERS
CONDITIONS
MIN
TYP
Output Voltage
VIN = 4V
(Note 1)
IL = 0mA
IL = 0mA
IL = 10mA
IL = – 10mA
Positive
Negative
Positive
Negative
●
●
●
●
6.5
–6
5.25
– 4.5
7
– 6.7
5.7
–5
V
V
V
V
VIN = 5V
IL = 15mA
IL = – 15mA
Positive
Negative
●
●
6.25
– 5.5
7
– 6.2
V
V
VIN = 10V
IL = 0mA
IL = 0mA
IL = 10mA
IL = – 10mA
IL = 15mA
IL = – 15mA
Positive
Negative
Positive
Negative
Positive
Negative
●
●
●
●
●
●
18
– 17.7
16
– 15.3
15.25
– 14.5
18.5
– 18
17.6
– 17
17
– 16.5
V
V
V
V
V
V
VIN = 5V
IL = 10mA, – 10mA
Positive
Negative
●
●
6.25
– 5.5
7.2
– 6.5
V
V
VIN = 10V
IL = 10mA, – 10mA
Positive
Negative
●
●
15
– 14.25
16.8
– 15.75
V
V
VIN = 4V
VIN = 10V
IL = 0mA
IL = 0mA
Supply Current
The ● 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 ≤ 40°C
2
●
●
7
15
MAX
12.5
30
UNITS
mA
mA
LT1026
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TYPICAL PERFORMANCE CHARACTERISTICS
Load Regulation (Both Outputs
Loaded)
Load Regulation for Positive
Loading
C = 1µF
VIN = 5V
TA = 25°C
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OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
6
4
2
0
–2
–4
10
10
8
8
6
6
4
2
–2
–4
–6
–8
–8
0
5
15
20
10
LOAD CURRENT (mA)
C = 1µF
VIN = 5V
TA = 25°C
0
–6
–10
–10
25
Supply Current
IL = 0
5
0
15
25
0
C = 22µF
VIN = 5V
TA = 25°C
NEGATIVE
OUTPUT
LOADED
5
15
20
10
LOAD CURRENT (mA)
40
30
20
25
25
LT1026 • TPC03
C = 22µF
VIN = 5V
TA = 25°C
POSITIVE
OUTPUT
LOADED
50
40
30
20
10
0
0
10
15
20
OUTPUT CURRENT (mA)
0
Supply Current
10
0
5
25
10
15
20
OUTPUT CURRENT (mA)
LT1026 • TPC04
0
5
10
15
20
OUTPUT CURRENT (mA)
LT1026 • TPC05
Ripple
25
LT1026 • TPC06
Output Voltage vs Temperature
10
60
VIN = 5V
IL = 5mV
BOTH OUTPUTS
8
6
OUTPUT VOLTAGE (V)
50
RIPPLE (mVP-P)
–4
–10
15
20
10
LOAD CURRENT (mA)
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
30
5
–2
60
50
45
C = 1µF
VIN = 5V
TA = 25°C
0
Supply Current
C = 22µF
VIN = 5V
TA = 25°C
BOTH OUTPUTS
LOADED
0
2
–8
60
60
4
LT1026 • TPC02
90
75
IL = 0
–6
LT1026 • TPC01
SUPPLY CURRENT (mA)
OUTPUT VOLTAGE (V)
10
Load Regulation for Negative
Loading
40
30
20
4
2
0
–2
C = 22µF
VIN = 5V
IL = 1mA
–4
–6
10
–8
0
1.0
2.2
4.7
10
22
47
OUTPUT CAPACITOR (µF)
100
1026 • TPC07
–10
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1026 • TPC08
3
LT1026
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W
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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.
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.
Only four external components are needed for operation.
Two charge pump capacitors and two output storage
capacitors. Nominal value for these capacitors is 1µF, but
the LT1026 will operate (with reduced performance) down
to 0.1µF. Higher value capacitors (22µF) will reduce ripple
and slightly lower output impedance. For higher output
currents the outputs of several converters may be paralleled with common output capacitors.
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.
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TYPICAL APPLICATIONS
Positive to Negative Converter
1
–VOUT
2
1µF
+
1µF
3
+
4
C1–
+VOUT
C2+
C1+
LT1026
C2–
VIN
–VOUT
GND
8
NC
7
6
VIN
5
1026 • TA03
Voltage Doubler
1µF
+
1
2
3
4
C1–
+VOUT
LT1026
–VOUT
+
7
C1+
C2+
C2–
8
VIN
GND
6
1µF
VIN
5
1026 • TA04
4
VOUT
LT1026
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TYPICAL APPLICATIONS
Standard Configuration Voltage Doubler and Inverter
C1
1µF
+
1
C1–
+VOUT
2
C2+
C1+
+
C2
1µF
3
4
–VOUT
8
LT1026
C2–
–VOUT
1µF
6
VIN
+VOUT
+
7
VIN
5
GND
1µF
+
1026 • TA05
Voltage Quadrupler
C1
1µF
+
1
2
+
C2
1µF
3
4
C1–
+VOUT
C2+
C1+
LT1026
C2–
VIN
–VOUT
GND
8
+
7
+VOUT
1µF
6
VIN (FLOATING)
5
+
1026 • TA06
1µF
Parallel Converters for Higher Output Current and Lower Output Impedance
C1
1µF
C1
1µF
C2
1µF
+
3
4
8
1
7
C1+
2
+VOUT
C2+
LT1026
C2–
–VOUT
VIN
GND
6
VIN
C2
1µF
5
+
3
4
C1–
+VOUT
LT1026
–VOUT
+
7
C1+
C2+
C2–
8
VIN
GND
6
+VOUT
1µF
VIN
5
1026 • TA07
–VOUT
+
2
C1–
+
+
1
1µF
5
LT1026
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TYPICAL APPLICATIONS
5V Powered RS232 Line Driver
C1
1µF
+
1
C1–
+VOUT
2
C2+
C1+
+
LT1026
3
C2–
4
VIN
–VOUT
GND
8
+
7
6
1µF
LT1030
5VIN
5
LOGIC
LINE
+
1026 • TA08
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PACKAGE DESCRIPTION
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)
0.040
(1.016)
MAX
0.050
(1.270)
MAX
SEATING
PLANE
0.165 – 0.185
(4.191 – 4.699)
GAUGE
PLANE
0.010 – 0.045*
(0.254 – 1.143)
REFERENCE
PLANE
0.500 – 0.750
(12.700 – 19.050)
0.016 – 0.021**
(0.406 – 0.533)
0.027 – 0.045
(0.686 – 1.143)
45°TYP
0.028 – 0.034
(0.711 – 0.864)
PIN 1
0.230
(5.842)
TYP
0.110 – 0.160
(2.794 – 4.064)
INSULATING
STANDOFF
*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
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LT1026
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PACKAGE DESCRIPTION
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
0.005
(0.127)
MIN
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
8
6
7
5
0.025
(0.635)
RAD TYP
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
0.220 – 0.310
(5.588 – 7.874)
1
2
3
4
0.300 BSC
(0.762 BSC)
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)
0.125
3.175
0.100 ± 0.010 MIN
(2.540 ± 0.254)
0.014 – 0.026
(0.360 – 0.660)
J8 1197
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
+0.035
0.325 –0.015
8.255
+0.889
–0.381
)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
0.100 ± 0.010
(2.540 ± 0.254)
0.125
(3.175) 0.020
MIN (0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
N8 1197
*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.
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LT1026
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TYPICAL APPLICATION
Regulated Converter
C1
1µF
+
1
2
+
C2
1µF
3
4
C1–
+VOUT
8
+
7
C1+
C2+
LT1026
C2–
VIN
–VOUT
GND
6
+VOUT
9
1µF
8
VIN ≥ 4V
INPUT –
3
VIN
GND
2
OUT
5V
0.001µF
500k
5
5
LT1020
COMP/PNP
FB
INPUT +
1µF
REFOUT
+
7
10µF
500k
COMP/NPN
4
+
11
6
+
10µF
0.001µF
1M
500k
500k
–5V REG 10mA
1026 • TA09
2N3904
51k
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PACKAGE DESCRIPTION
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)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
8
7
6
5
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
0.050
(1.270)
TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
*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
SO8 0996
1
2
3
4
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1517-5
Micropower, Regulated 5V In SOT-23
Ultralow Power: ICC = 6µA Typical, Small 5-Pin SOT-23
LTC1550/LTC1551
Low Noise, Switched Capacitor Regulator Voltage Inverter
< 1mVp-p Typical Output Ripple, 900kHz, IOUT = 10mA
LTC1555/LTC1556
SIM Power Supply and Level Translator
Step-Up/Step-Down Generates 5V, Input Voltage Range:
2.7V to 10V, > 10kV ESD, Short-Circuit and Overtemp Protection
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
1026fa LT/TP 0498 REV A 2K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1988
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