LT1026MH

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 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. 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. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S s s s s Line Drivers Op Amp Suppliers Battery Splitters RS232 Power TYPICAL APPLICATIO C1 1µF Voltage Doubler and Inverter 10 8 6 OUTPUT VOLTAGE (V) 1 2 C2 1µF –VOUT C1– C2+ LT1026 C2– –VOUT +VOUT C1+ VIN GND 8 7 6 5 VIN 4 2 0 –2 –4 –6 –8 –10 + +VOUT 1µF + 3 4 1µF 1026 • TA01 0 5 U Output Voltage C = 1µF VIN = 5V TA = 25°C 15 20 10 LOAD CURRENT (mA) 25 LT1026 • TA02 U U + + 1026fb 1 LT1026 ABSOLUTE MAXIMUM RATINGS U WW VIN GND Supply Voltage ........................................................ 10V V + ............................................................................ 20V V – ..........................................................................– 20V Short-Circuit Duration ......................................... 10 sec PACKAGE/ORDER INFORMATION TOP VIEW +VOUT C1– 1 C2+ 2 C2– 3 5 4 –VOUT 8 7 C1+ 6 C1– 1 C2+ 2 C2– 3 –VOUT 4 J8 PACKAGE 8-LEAD CERDIP H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 150°C, θJA = 150°C/W TJMAX = 150°C, θJA = 150°C/W ORDER PART NUMBER LT1026CH LT1026MH ORDER PART NUMBER LT1026CJ8 LT1026MJ8 OBSOLETE PACKAGES Consider the N8 or S8 Packages for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS PARAMETERS Output Voltage CONDITIONS VIN = 4V (Note 2) 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 The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. MIN 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 VIN = 5V VIN = 10V VIN = 5V VIN = 10V 2 U W U W (Note 1) Operating Temperature Range LT1026C ................................................. 0°C to 70°C LT1026I .............................................. – 40°C to 85°C LT1026M (OBSOLETE) ............... – 55°C to 125°C Lead Temperature (Soldering, 10 sec)................. 300°C TOP VIEW 8 +VOUT 7 C1+ 6 VIN 5 GND C1– 1 C2+ C2– 2 3 TOP VIEW 8 +VOUT 7 C1+ 6 VIN 5 GND S8 PACKAGE 8-LEAD PLASTIC SO –VOUT 4 N8 PACKAGE 8-LEAD PDIP TJMAX = 150°C, θJA = 100°C/W (N8) TJMAX = 150°C, θJA = 150°C/W (S8) ORDER PART NUMBER LT1026CN8 LT1026CS8 LT1026IS8 S8 PART MARKING 1026 1026I 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 MAX UNITS V V V V V V V V V V V V V V V V 1026fb 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 LT1026 ELECTRICAL CHARACTERISTICS PARAMETERS Supply Current CONDITIONS VIN = 4V VIN = 10V IL = 0mA IL = 0mA The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. MIN q q TYP 7 15 MAX 12.5 30 UNITS mA mA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: VIN min = – 4.5 for TA ≤ 40°C TYPICAL PERFORMANCE CHARACTERISTICS Load Regulation (Both Outputs Loaded) 10 8 6 C = 1µF VIN = 5V TA = 25°C 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 = 1µF VIN = 5V TA = 25°C OUTPUT VOLTAGE (V) Supply Current 90 75 C = 22µF VIN = 5V TA = 25°C BOTH OUTPUTS LOADED 60 50 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 60 45 30 15 0 0 40 30 20 10 0 SUPPLY CURRENT (mA) 5 10 15 20 OUTPUT CURRENT (mA) UW LT1026 • TPC01 Load Regulation for Positive Loading 10 8 6 4 2 0 –2 –4 –6 –8 25 –10 Load Regulation for Negative Loading IL = 0 C = 1µF VIN = 5V TA = 25°C 15 20 10 LOAD CURRENT (mA) 0 5 15 20 10 LOAD CURRENT (mA) 25 LT1026 • TPC02 LT1026 • TPC03 Supply Current 60 C = 22µF VIN = 5V TA = 25°C NEGATIVE OUTPUT LOADED 50 40 30 20 10 0 0 5 10 15 20 OUTPUT CURRENT (mA) 25 Supply Current C = 22µF VIN = 5V TA = 25°C POSITIVE OUTPUT LOADED 25 0 5 10 15 20 OUTPUT CURRENT (mA) 25 LT1026 • TPC04 LT1026 • TPC05 LT1026 • TPC06 1026fb 3 LT1026 TYPICAL PERFORMANCE CHARACTERISTICS 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 47 4.7 10 22 OUTPUT CAPACITOR (µF) 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 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. 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. 4 U W UW Output Voltage vs Temperature 4 2 0 –2 –4 –6 –8 C = 22µF VIN = 5V IL = 1mA 100 –10 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1026 • TPC07 LT1026 • TPC08 U U 1026fb LT1026 TYPICAL APPLICATIONS Positive to Negative Converter 1 2 1µF –VOUT C1– C2+ LT1026 C2– –VOUT VIN GND 8 7 6 5 NC +VOUT C1+ + 3 4 1µF Standard Configuration Voltage Doubler and Inverter C1 1µF 1 2 C2 1µF –VOUT C1– C2+ LT1026 C2– –VOUT +VOUT C1+ VIN GND + 3 4 1µF Parallel Converters for Higher Output Current and Lower Output Impedance 1 2 C2 1µF C1– C2+ LT1026 C2– –VOUT + 3 4 + U 8 7 6 5 Voltage Doubler 1µF NC + 1 VIN C1– C2+ LT1026 C2– –VOUT +VOUT C1+ VIN GND 8 7 6 5 VIN 2 3 1026 • TA03 + VOUT 1µF + 4 1026 • TA04 Voltage Quadrupler C1 1µF + + VIN +VOUT 1µF + 1 2 C2 1µF C1– C2+ LT1026 C2– –VOUT +VOUT 8 + 3 4 7 C1+ VIN GND 6 5 + +VOUT 1µF VIN (FLOATING) + + 1026 • TA05 1µF 1026 • TA06 C1 1µF C1 1µF + +VOUT C1+ VIN GND 8 7 6 5 VIN C2 1µF 1 2 C1– C2+ + +VOUT C1+ LT1026 C2– –VOUT VIN GND 8 7 6 5 VIN + +VOUT 1µF + 3 4 1026 • TA07 –VOUT 1µF 1026fb 5 LT1026 TYPICAL APPLICATIONS 5V Powered RS232 Line Driver C1 1µF + 3 4 PACKAGE DESCRIPTION H Package 8-Lead TO-5 Metal Can (.230 Inch PCD) (Reference LTC DWG # 05-08-1321) .335 – .370 (8.509 – 9.398) DIA .305 – .335 (7.747 – 8.509) .040 (1.016) MAX .050 (1.270) MAX GAUGE PLANE .165 – .185 (4.191 – 4.699) REFERENCE PLANE .500 – .750 (12.700 – 19.050) SEATING PLANE .010 – .045* (0.254 – 1.143) .016 – .021** (0.406 – 0.533) *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND THE SEATING PLANE .016 – .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 – 0.610) 6 U U + 1 2 C1– C2+ LT1026 C2– –VOUT +VOUT C1+ VIN GND 8 7 6 5 LOGIC LINE 5VIN + 1µF LT1030 + 1026 • TA08 45°TYP .028 – .034 (0.711 – 0.864) .027 – .045 (0.686 – 1.143) PIN 1 .230 (5.842) TYP H8 (TO-5) 0.230 PCD 0801 .110 – .160 (2.794 – 4.064) INSULATING STANDOFF OBSOLETE PACKAGE 1026fb LT1026 PACKAGE DESCRIPTION J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .005 (0.127) MIN .405 (10.287) MAX 8 7 6 5 .300 BSC (7.62 BSC) CORNER LEADS OPTION (4 PLCS) .008 – .018 (0.203 – 0.457) 0° – 15° .045 – .068 (1.143 – 1.650) FULL LEAD OPTION NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) ( +.035 .325 –.015 +0.889 8.255 –0.381 ) INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) NOTE: 1. DIMENSIONS ARE .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 0°– 8° TYP .053 – .069 (1.346 – 1.752) .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) .014 – .019 (0.355 – 0.483) TYP 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. U .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .025 (0.635) RAD TYP 1 2 3 .220 – .310 (5.588 – 7.874) 4 J8 0801 .045 – .065 (1.143 – 1.651) .014 – .026 (0.360 – 0.660) .100 (2.54) BSC .125 3.175 MIN OBSOLETE PACKAGE N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .130 ± .005 (3.302 ± 0.127) .400* (10.160) MAX 8 7 6 5 .045 – .065 (1.143 – 1.651) .255 ± .015* (6.477 ± 0.381) 1 2 3 4 N8 1002 .100 (2.54) BSC S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .004 – .010 (0.101 – 0.254) 8 7 6 5 .050 BSC .045 ±.005 .050 (1.270) BSC .228 – .244 (5.791 – 6.197) .150 – .157 .245 (3.810 – 3.988) MIN NOTE 3 .160 ±.005 1 2 3 4 .030 ±.005 TYP SO8 0303 RECOMMENDED SOLDER PAD LAYOUT 1026fb 7 LT1026 TYPICAL APPLICATION Regulated Converter C1 1µF 1 2 C2 1µF C1– C2+ LT1026 C2– –VOUT +VOUT C1+ VIN GND 8 7 6 5 VIN ≥ 4V + 3 4 1µF RELATED PARTS PART NUMBER LT1044 LT1054/LT1054L LTC1517-5 LTC1550/LTC1551 LTC1555/LTC1556 DESCRIPTION Switched Capacitor Voltage Converter Switched Capacitors Voltage Converters with Regulator Micropower, Regulated 5V In SOT-23 Low Noise, Switched Capacitor Regulator Voltage Inverter SIM Power Supply and Level Translator COMMENTS Can be Used as Inverter/Doubler/Divider or a Multiplier, VIN = 1.5V to 9V, IQ = 60µA, SO-8 IOUT to 100mA/125mA, VIN = 3.5V to 15V, Inverter, Neg/Pos Doubler Ultralow Power: ICC = 6µA 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 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 + + +VOUT 1µF 9 8 INPUT – GND VIN OUT LT1020 COMP/PNP INPUT + 7 0.001µF 1M 500k 500k –5V REG 10mA 1026 • TA09 3 2 500k 0.001µF 5V 5 FB REFOUT 4 COMP/NPN 6 11 500k + 10µF + + 10µF 2N3904 51k 1026fb LT/TP 0203 REV B 1K • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1988