LTC1044AIS8

LTC1044A 12V CMOS Voltage Converter FEATURES s s s s s DESCRIPTIO s s s 1.5V to 12V Operating Supply Voltage Range 13V Absolute Maximum Rating 200µA Maximum No Load Supply Current at 5V Boost Pin (Pin 1) for Higher Switching Frequency 97% Minimum Open Circuit Voltage Conversion Efficiency 95% Minimum Power Conversion Efficiency IS = 1.5µA with 5V Supply When OSC Pin = 0V or V + High Voltage Upgrade to ICL7660/LTC1044 The LTC1044A is a monolithic CMOS switched-capacitor voltage converter. It plugs in for ICL7660/LTC1044 in applications where higher input voltage (up to 12V) is needed. The LTC1044A provides several conversion functions without using inductors. The input voltage can be inverted (VOUT = – VIN), doubled (VOUT = 2VIN), divided (VOUT = VIN/2) or multiplied (VOUT = ± nVIN). To optimize performance in specific applications, a boost function is available to raise the internal oscillator frequency by a factor of 7. Smaller external capacitors can be used in higher frequency operation to save board space. The internal oscillator can also be disabled to save power. The supply current drops to 1.5µA at 5V input when the OSC pin is tied to GND or V +. APPLICATI s s s s s s s S Conversion of 10V to ±10V Supplies Conversion of 5V to ± 5V Supplies Precise Voltage Division: VOUT = VIN/2 ± 20ppm Voltage Multiplication: VOUT = ± nVIN Supply Splitter: VOUT = ± VS/2 Automotive Applications Battery Systems with 9V Wall Adapters/Chargers TYPICAL APPLICATI Generating – 10V from 10V LTC1044A 1 2 BOOST CAP+ GND CAP– V+ OSC LV VOUT LTC1044A • TA01 Output Voltage vs Load Current, V + = 10V 0 8 7 10V INPUT OUTPUT VOLTAGE (V) –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 0 TA = 25°C C1 = C2 = 10µF + 10µF 3 4 6 5 –10V OUTPUT 10µF 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) LTC1044A • TA02 U SLOPE = 45Ω + UO UO 1 LTC1044A ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW BOOST 1 CAP+ 2 GND 3 CAP– 4 8 7 6 5 V+ OSC LV VOUT Supply Voltage ........................................................ 13V Input Voltage on Pins 1, 6 and 7 (Note 2) .............................. – 0.3V < VIN < V + + 0.3V Current into Pin 6 ................................................. 20µA Output Short-Circuit Duration V + ≤ 6.5V ................................................. Continuous Operating Temperature Range LTC1044AC ............................................ 0°C to 70°C LTC1044AI ........................................ – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C ORDER PART NUMBER LTC1044ACN8 LTC1044AIN8 N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 110°C, θJA = 100°C/W TOP VIEW BOOST 1 CAP+ 2 8 7 6 5 V+ OSC LV VOUT ORDER PART NUMBER LTC1044ACS8 LTC1044AIS8 S8 PART MARKING 1044A 1044AI GND 3 CAP– 4 S8 PACKAGE 8-LEAD PLASTIC SOIC TJMAX = 110°C, θJA = 130°C/W Consult factory for Military grade parts ELECTRICAL CHARACTERISTICS SYMBOL IS PARAMETER Supply Current CONDITIONS V + = 5V, COSC = 0pF, TA = 25°C, See Test Circuit, unless otherwise noted. MIN LTC1044AC LTC1044AI TYP MAX MIN TYP MAX 60 15 q q q q q q UNITS µA µA V RL = ∞, Pins 1 and 7, No Connection RL = ∞, Pins 1 and 7, No Connection, V + = 3V RL = 10k RL = 10k IL = 20mA, fOSC = 5kHz V + = 2V, IL = 3mA, fOSC = 1kHz 1.5 200 60 15 1.5 200 Minimum Supply Voltage Maximum Supply Voltage ROUT Output Resistance 12 100 120 310 5 1 95 97 98 99.9 3 20 5 1 95 97 98 99.9 12 100 130 325 fOSC PEFF Oscillator Frequency Power Efficiency Voltage Conversion Efficiency Oscillator Sink or Source Current V + = 5V, (Note 3) V + = 2V RL = 5k, fOSC = 5kHz RL = ∞ VOSC = 0V or V + Pin 1 (BOOST) = 0V Pin 1 (BOOST) = V + q q 3 20 The q denotes specifications which apply over the full operating temperature range; all other limits and typicals TA = 25°C. Note 1: Absolute maximum ratings are those values beyond which the life of a device may be impaired. Note 2: Connecting any input terminal to voltages greater than V + or less than ground may cause destructive latch-up. It is recommended that no inputs from sources operating from external supplies be applied prior to power-up of the LTC1044A. Note 3: fOSC is tested with COSC = 100pF to minimize the effects of test fixture capacitance loading. The 0pF frequency is correlated to this 100pF test point, and is intended to simulate the capacitance at pin 7 when the device is plugged into a test socket and no external capacitor is used. 2 U V Ω Ω Ω kHz kHz % % µA µA W U U WW W LTC1044A TYPICAL PERFOR A CE CHARACTERISTICS Operating Voltage Range vs Temperature 14 12 POWER EFFICIENCY (%) 10 8 6 4 2 0 –55 –25 POWER EFFICIENCY (%) SUPPLY VOLTAGE (V) 0 50 100 25 75 AMBIENT TEMPERATURE (°C) LTC1044A • TPC01 Output Resistance vs Oscillator Frequency, V + = 5V 500 C1 = C2 = 10µF TA = 25°C IL = 10mA OUTPUT RESISTANCE (Ω) POWER CONVERSION EFFICIENCY (%) OUTPUT RESISTANCE (Ω) 400 300 C1 = C2 = 1µF 200 100 C1 = C2 = 100µF 0 100 1k 10k OSCILLATOR FREQUENCY (Hz) 100k LTC1044A • TPC04 Power Conversion Efficiency vs Load Current, V + = 5V 100 POWER CONVERSION EFFICIENCY (%) PEFF POWER CONVERSION EFFICIENCY (%) 90 80 70 60 50 40 30 20 10 0 0 10 40 30 20 50 LOAD CURRENT (mA) UW IS Using the Test Circuit Power Efficiency vs Oscillator Frequency, V + = 10V 100 98 96 100µF 10µF IL = 1mA 10µF TA = 25°C C1 = C2 Power Efficiency vs Oscillator Frequency, V + = 5V 100 98 96 94 92 90 88 86 84 82 125 80 100 100µF 10µF 100µF 10µF 1µF IL = 1mA TA = 25°C C1 = C2 94 92 90 88 86 84 82 100µF IL = 15mA IL = 15mA 1µF 1µF 1µF 1k 10k OSCILLATOR FREQUENCY (Hz) 100k 80 100 1k 10k OSCILLATOR FREQUENCY (Hz) 100k LTC1044A • G02 LTC1044A • TPC03 Output Resistance vs Oscillator Frequency, V + = 10V 500 TA = 25°C IL = 10mA 400 100 90 80 70 60 50 40 30 20 10 0 Power Conversion Efficiency vs Load Current, V + = 2V 10 PEFF TA = 25°C C1 = C2 = 10µF fOSC = 1kHz 9 8 SUPPLY CURRENT (mA) 7 IS 6 5 4 3 2 1 0 0 1 4 3 2 5 LOAD CURRENT (mA) 6 7 300 C1 = C2 = 100µF C1 = C2 = 10µF C1 = C2 = 1µF 200 100 0 100 1k 10k OSCILLATOR FREQUENCY (Hz) 100k LTC1044A • TPC05 LTC1044A • TPC06 Power Conversion Efficiency vs Load Current, V + = 10V 100 100 90 80 70 60 50 40 30 20 10 0 0 20 80 60 40 100 LOAD CURRENT (mA) 120 TA = 25°C C1 = C2 = 10µF fOSC = 20kHz IS PEFF 300 270 240 SUPPLY CURRENT (mA) TA = 25°C C1 = C2 = 10µF fOSC = 5kHz 90 80 SUPPLY CURRENT (mA) 70 60 50 40 30 20 10 0 60 70 210 180 150 120 90 60 30 0 140 LTC1044A • TPC07 LTC1044A • TPC08 3 LTC1044A TYPICAL PERFOR A CE CHARACTERISTICS Output Resistance vs Supply Voltage 1000 TA = 25°C IL = 3mA OUTPUT RESISTANCE (Ω) OUTPUT VOLTAGE (V) COSC = 100pF 100 COSC = 0pF 1.0 0.5 0 – 0.5 –1.0 –1.5 –2.0 SLOPE = 250Ω OUTPUT VOLTAGE (V) 10 0 1 2 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) LTC1044A • TPC09 Output Voltage vs Load Current, V + = 10V 10 8 6 TA = 25°C fOSC = 20kHz OUTPUT RESISTANCE (Ω) 400 360 320 280 240 200 160 120 80 40 OSCILLATOR FREQUENCY (Hz) OUTPUT VOLTAGE (V) 4 2 0 –2 –4 –6 –8 –10 0 SLOPE = 45Ω 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) LTC1044A • TPC12 Oscillator Frequency as a Function of COSC, V + = 10V 100k V + = 10V TA = 25°C PIN 1 = V + 100k 10k OSCILLATOR FREQUENCY (kHz) OSCILLATOR FREQUENCY (Hz) OSCILLATOR FREQUENCY (Hz) 1k PIN 1 = OPEN 100 10 1 100 1000 10000 10 EXTERNAL CAPACITOR (PIN 7 TO GND)(pF) LTC1044A • TPC15 4 UW Using the Test Circuit Output Voltage vs Load Current, V + = 5V 5 4 3 2 1 0 –1 –2 –3 –4 SLOPE = 80Ω TA = 25°C fOSC = 5kHz Output Voltage vs Load Current, V + = 2V 2.5 2.0 1.5 TA = 25°C fOSC = 1kHz –2.5 0 1 2 345678 LOAD CURRENT (mA) 9 10 –5 0 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) LTC1044A • TPC11 LTC1044A • TPC10 Output Resistance vs Temperature C1 = C2 = 10µF V + = 2V, fOSC = 1kHz Oscillator Frequency as a Function of COSC, V + = 5V 100k TA = 25°C PIN 1 = V + 10k 1k PIN 1 = OPEN 100 V + = 5V, fOSC = 5kHz V + = 10V, fOSC = 20kHz 0 50 25 0 75 100 –55 –25 AMBIENT TEMPERATURE (°C) 125 10 1 100 1000 10000 10 EXTERNAL CAPACITOR (PIN 7 TO GND)(pF) LTC1044A • TPC14 LTC1044A • TPC13 Oscillator Frequency vs Supply Voltage 35 TA = 25°C COSC = 0pF Oscillator Frequency vs Temperature COSC = 0pF 30 25 20 15 10 5 0 –55 –25 V + = 5V 10k V + = 10V 1k 0.1k 0 1 2 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) LTC1044A • G16 50 100 25 75 0 AMBIENT TEMPERATURE (°C) 125 LTC1044A • TPC17 LTC1044A TEST CIRCUIT V + (5V) IS 1 2 8 7 LTC1044A 6 5 LTC1044A • TC + C1 10µF 3 4 EXTERNAL OSCILLATOR RL IL VOUT APPLICATI S I FOR ATIO Theory of Operation To understand the theory of operation of the LTC1044A, a review of a basic switched-capacitor building block is helpful. In Figure 1, when the switch is in the left position, capacitor C1 will charge to voltage V1. The total charge on C1 will be q1 = C1V1. The switch then moves to the right, discharging C1 to voltage V2. After this discharge time, the charge on C1 is q2 = C1V2. Note that charge has been transferred from the source, V1, to the output, V2. The amount of charge transferred is: ∆q = q1 – q2 = C1(V1 – V2) If the switch is cycled f times per second, the charge transfer per unit time (i.e., current) is: I = f × ∆q = f × C1(V1 – V2) V1 f RL C1 C2 LTC1044A • F01 REQUIV V1 V2 REQUIV = 1 f × C1 Figure 2. Switched-Capacitor Equivalent Circuit Examination of Figure 3 shows that the LTC1044A has the same switching action as the basic switched-capacitor building block. With the addition of finite switch-on resistance and output voltage ripple, the simple theory although not exact, provides an intuitive feel for how the device works. For example, if you examine power conversion efficiency as a function of frequency (see typical curve), this simple theory will explain how the LTC1044A behaves. The loss, and hence the efficiency, is set by the output impedance. As frequency is decreased, the output impedance will eventually be dominated by the 1/(f × C1) term, and power efficiency will drop. The typical curves for Power Efficiency vs Frequency show this effect for various capacitor values. Note also that power efficiency decreases as frequency goes up. This is caused by internal switching losses which occur due to some finite charge being lost on each switching cycle. This charge loss per unit cycle, when multiplied by the switching frequency, becomes a current loss. At high frequency this loss becomes significant and the power efficiency starts to decrease. V2 Figure 1. Switched-Capacitor Building Block Rewriting in terms of voltage and impedance equivalence, I = V1 – V2 = V1 – V2 1/(f × C1) REQUIV A new variable, REQUIV, has been defined such that REQUIV = 1/(f × C1). Thus, the equivalent circuit for the switchedcapacitor network is as shown in Figure 2. + COSC C2 10µF U C2 RL LTC1044A • F02 W U UO 5 LTC1044A APPLICATI S I FOR ATIO V+ (8) SW1 BOOST 7X (1) OSC OSC (7) φ C+ (2) SW2 ÷2 LV (6) CLOSED WHEN V + > 3V LTC1044A • F03 GND (3) Figure 3. LTC1044A Switched-Capacitor Voltage Converter Block Diagram LV (Pin 6) The internal logic of the LTC1044A runs between V + and LV (pin 6). For V + greater than or equal to 3V, an internal switch shorts LV to GND (pin 3). For V + less than 3V, the LV pin should be tied to GND. For V + greater than or equal to 3V, the LV pin can be tied to GND or left floating. OSC (Pin 7) and Boost (Pin 1) The switching frequency can be raised, lowered, or driven from an external source. Figure 4 shows a functional diagram of the oscillator circuit. By connecting the boost pin (pin 1) to V +, the charge and discharge current is increased and hence, the frequency is increased by approximately 7 times. Increasing the V+ frequency will decrease output impedance and ripple for higher load currents. Loading pin 7 with more capacitance will lower the frequency. Using the boost (pin 1) in conjunction with external capacitance on pin 7 allows user selection of the frequency over a wide range. Driving the LTC1044A from an external frequency source can be easily achieved by driving pin 7 and leaving the boost pin open as shown in Figure 5. The output current from pin 7 is small (typically 0.5µA) so a logic gate is capable of driving this current. The choice of using a CMOS logic gate is best because it can operate over a wide supply voltage range (3V to 15V) and has enough voltage swing to drive the internal Schmitt trigger shown in Figure 4. For 5V applications, a TTL logic gate can be used by simply adding an external pull-up resistor (see Figure 5). V+ 100k REQUIRED FOR TTL LOGIC OSC INPUT 6I BOOST (1) I NC 1 2 LTC1044A 8 7 6 5 + C1 3 4 6I LV (6) I LTC1044A • F04 Figure 5. External Clocking Figure 4. Oscillator 6 + ~14pF OSC (7) SCHMITT TRIGGER + U + C1 φ C– (4) VOUT (5) C2 –(V +) C2 LTC1044A • F05 W U UO LTC1044A APPLICATI S I FOR ATIO Capacitor Selection External capacitors C1 and C2 are not critical. Matching is not required, nor do they have to be high quality or tight tolerance. Aluminum or tantalum electrolytics are excellent choices with cost and size being the only consideration. Negative Voltage Converter Figure 6 shows a typical connection which will provide a negative supply from an available positive supply. This circuit operates over full temperature and power supply ranges without the need of any external diodes. The LV pin (pin 6) is shown grounded, but for V + ≥ 3V it may be “floated”, since LV is internally switched to ground (pin 3) for V + ≥ 3V. The output voltage (pin 5) characteristics of the circuit are those of a nearly ideal voltage source in series with an 80Ω resistor. The 80Ω output impedance is composed of two terms: 1. The equivalent switched-capacitor resistance (see Theory of Operation). 2. A term related to the on-resistance of the MOS switches. At an oscillator frequency of 10kHz and C1 = 10µF, the first term is: REQUIV = = 1 (fOSC/2) × C1 1 = 20Ω 5 × 103 × 10 × 10 –6 + C1 10µF Notice that the above equation for REQUIV is not a capacitive reactance equation (XC = 1/ωC) and does not contain a 2π term. 1 2 8 7 LTC1044A 6 5 REQUIRED FOR V + < 3V VOUT = – V + 10µF V + (1.5V TO 12V) + 10µF 3 4 TMIN ≤ TA ≤ TMAX Figure 6. Negative Voltage Converter + LTC1044A • F06 U The exact expression for output resistance is extremely complex, but the dominant effect of the capacitor is clearly shown on the typical curves of Output Resistance and Power Efficiency vs Frequency. For C1 = C2 = 10µF, the output impedance goes from 60Ω at fOSC = 10kHz to 200Ω at fOSC = 1kHz. As the 1/(f × C) term becomes large compared to the switch-on resistance term, the output resistance is determined by 1/(f × C) only. Voltage Doubling Figure 7 shows a two-diode capacitive voltage doubler. With a 5V input, the output is 9.93V with no load and 9.13V with a 10mA load. With a 10V input, the output is 19.93V with no load and 19.28V with a 10mA load. VIN (1.5V TO 12V) 1 2 3 4 LTC1044A • F07 W U UO 8 7 LTC1044A 6 5 Vd 1N5817 REQUIRED FOR V + < 3V + + + Vd 1N5817 VOUT = 2(VIN – 1) 10µF + 10µF Figure 7. Voltage Doubler Ultra-Precision Voltage Divider An ultra-precision voltage divider is shown in Figure 8. To achieve the 0.0002% accuracy indicated, the load current should be kept below 100nA. However, with a slight loss in accuracy the load current can be increased. 1 2 3 4 LTC1044A • F08 8 7 LTC1044A 6 5 V + (3V TO 24V) V +/2 ±0.002% TMIN ≤ TA ≤ TMAX IL ≤ 100nA + C2 10µF REQUIRED FOR V + < 6V Figure 8. Ultra-Precision Voltage Divider 7 LTC1044A APPLICATI Battery Splitter S I FOR ATIO A common need in many systems is to obtain (+) and (–) supplies from a single battery or single power supply system. Where current requirements are small, the circuit shown in Figure 9 is a simple solution. It provides symmetrical ± output voltages, both equal to one half input voltage. The output voltages are both referenced to pin 3 1 8 7 LTC1044A 6 5 LTC1044A • F09 + +VB/2 (6V) VB 12V 2 + C1 3 4 10µF REQUIRED FOR V B < 6V +VB/2 (–6V) C2 10µF OUTPUT COMMON Figure 9. Battery Splitter 1 2 8 7 LTC1044A 6 5 + C1 3 4 10 µ F * LTC1044A • F10 *THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044As TO MINIMIZE RIPPLE Figure 10. Paralleling for Lower Output Resistance V+ FOR V OUT = – 3V + FOR V OUT = – 2V + 1 2 8 7 LTC1044A 6 5 – (V + ) 10 µ F 10 µ F 1 2 3 4 LTC1044A • F11 8 7 LTC1044A 6 5 10 µ F V OUT + + 10 µ F 3 4 Figure 11. Stacking for Higher Voltage 8 + + + U (output common). If the input voltage between pin 8 and pin 5 is less than 6V, pin 6 should also be connected to pin 3 as shown by the dashed line. Paralleling for Lower Output Resistance Additional flexibility of the LTC1044A is shown in Figures 10 and 11. Figure 10 shows two LTC1044As connected in parallel to provide a lower effective output resistance. If, however, the output resistance is dominated by 1/(f × C1), increasing the capacitor size (C1) or increasing the frequency will be of more benefit than the paralleling circuit shown. Figure 11 makes use of “stacking” two LTC1044As to provide even higher voltages. A negative voltage doubler or tripler can be achieved, depending upon how pin 8 of the second LTC1044A is connected, as shown schematically by the switch. The available output current will be dictated/ decreased by the product of the individual power conversion efficiencies and the voltage step-up ratio. V+ 1 2 8 7 LTC1044A 6 5 V OUT = – (V + ) W + U UO + C1 3 4 10 µ F 1/4 CD4077 C2 20 µ F LTC1044A TYPICAL APPLICATIO S Low Output Impedance Voltage Converter 200k 8.2k 50k 6 1 8 200k 39k 0.1µF VOUT ADJ VIN* 3 + – 4 50k 39k LM10 2 LTC1044A LTC1044 • F12 1 2 3 10µF 4 *VIN ≥ –VOUT + 0.5V LOAD REGULATION ±0.02%, 0mA TO 15mA + Single 5V Strain Gauge Bridge Signal Conditioner 1 2 8 7 LTC1044A 6 5 –5V 100µF + 220Ω 100µF 3 4 + 8 4 0.33µF 3 1.2V REFERENCE TO A/D CONVERTER FOR RATIOMETRIC OPERATION (1mA MAX) 10k LT1004 ZERO 1.2V TRIM 301k* D 100k + 1 2 – LT1413 A 350Ω PRESSURE TRANSDUCER E 0V 5 + 7 39k *1% FILM RESISTOR PRESSURE TRANSDUCER BLH/DHF-350 (CIRCLED LETTER IS PIN NUMBER) ≈ – 1.2V C 0.1µF 6 – LTC1044A • F13 + U 7 + 8 100µF 7 6 5 OUTPUT 10µF 5V 2k GAIN TRIM 46k* OUTPUT 0V TO 3.5V 0psi to 350psi 0.047µF 100Ω* 9 LTC1044A TYPICAL APPLICATIO S Regulated Output 3V to 5V Converter 3V 1N914 1 2 3 LTC1044A 8 7 6 5 1M 7 8 4.8M 1k 330k EVEREADY EXP-30 1 REF AMP LM10 2 1k 6 OP AMP 4 1N914 150k 100k LTC1044A • F14 Low Dropout 5V Regulator 2N2219 1N914 1 2 LTC1044A 8 7 6 5 12V VOUT = 5V 200Ω + + 10µF 3 4 10µF 100Ω 100k SHORT-CIRCUIT PROTECTION 2 8 V+ 5 FEEDBACK AMP LOAD 6V 4 EVEREADY E-91 CELLS 1M – LT1013 + 7 3 + V– 4 1 1N914 6 – LT1004 1.2V 0.01Ω 1.2k 10 – – + + U 200Ω + 100µF 5V OUTPUT + 10µF 4 3 120k 30k 50k OUTPUT ADJUST LTC1044A • F15 VDROPOUT AT 1mA = 1mV VDROPOUT AT 10mA = 15mV VDROPOUT AT 100mA = 95mV LTC1044A PACKAGE DESCRIPTIO U Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.400 (10.160) MAX 8 7 6 5 0.250 ± 0.010 (6.350 ± 0.254) 1 2 3 4 0.300 – 0.320 (7.620 – 8.128) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.009 – 0.015 (0.229 – 0.381) 0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN ( +0.025 0.325 –0.015 +0.635 8.255 –0.381 ) 0.045 ± 0.015 (1.143 ± 0.381) 0.100 ± 0.010 (2.540 ± 0.254) 0.018 ± 0.003 (0.457 ± 0.076) N8 0392 S8 Package 8-Lead Plastic SOIC 0.189 – 0.197 (4.801 – 5.004) 8 7 6 5 0.228 – 0.244 (5.791 – 6.197) 0.150 – 0.157 (3.810 – 3.988) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0°– 8° TYP 2 3 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.016 – 0.050 0.406 – 1.270 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.270) BSC SO8 0392 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. 11 LTC1044A U.S. Area Sales Offices NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 NORTHWEST REGION Linear Technology Corporation 782 Sycamore Dr. Milpitas, CA 95035 Phone: (408) 428-2050 FAX: (408) 432-6331 International Sales Offices FRANCE Linear Technology S.A.R.L. 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The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851 World Headquarters Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507 08/16/93 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 LT/GP 1293 10K REV 0 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1993