LTC1044A 12V CMOS Voltage Converter Features n n n n n n n n Description 1.5V to 12V Operating Supply Voltage Range 13V Absolute Maximum Rating 200A 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 = 1.5A with 5V Supply When OSC Pin = 0V or V+ High Voltage Upgrade to ICL7660/LTC1044 Applications n n n n n n n 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 The LTC(R)1044A 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 seven. 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 1.5A at 5V input when the OSC pin is tied to GND or V+. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application Output Voltage vs Load Current, V+ = 10V Generating -10V from 10V 0 LTC1044A 2 10F 3 4 CAP+ V+ OSC GND LV CAP- VOUT 1044a TA01a 8 10V INPUT 6 5 -10V OUTPUT 10F TA = 25C C1 = C2 = 10F -2 7 OUTPUT VOLTAGE (V) + BOOST + 1 -1 -3 -4 -5 -6 SLOPE = 45 -7 -8 -9 -10 0 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) 1044a TA01b 1044afa For more information www.linear.com/LTC1044A 1 LTC1044A Absolute Maximum Ratings (Note 1) Supply Voltage...........................................................13V Input Voltage on Pins 1, 6 and 7 (Note 2)...................................-0.3V < VIN < V+ + 0.3V Current into Pin 6.....................................................20A Output Short-Circuit Duration V+ 6.5V.......................................................Continuous Operating Temperature Range LTC1044AC............................................... 0C to 70C LTC1044AI............................................ -40C to 85C Storage Temperature Range.................... -65C to 150C Lead Temperature (Soldering, 10 sec)................... 300C Pin Configuration TOP VIEW BOOST 1 + TOP VIEW 8 V+ 8 V+ 2 7 OSC BOOST 1 CAP+ 2 7 OSC GND 3 6 LV GND 3 6 LV CAP- 4 5 VOUT CAP- 4 5 VOUT CAP N8 PACKAGE 8-LEAD PLASTIC DIP S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 110C, JA = 100C/W TJMAX = 110C, JA = 130C/W Consult factory for military grade parts Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1044ACN8#PBF LTC1044ACN8#TRPBF LTC1044 ACN8 8-Lead Plastic DIP 0C to 70C LTC1044AIN8#PBF LTC1044AIN8#TRPBF LTC1044 AIN8 8-Lead Plastic DIP -40C to 85C LTC1044ACS8#PBF LTC1044ACS8#TRPBF 1044A 8-Lead Plastic SO 0C to 70C LTC1044AIS8#PBF LTC1044AIS8#TRPBF 1044AI 8-Lead Plastic SO -40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 1044afa 2 For more information www.linear.com/LTC1044A LTC1044A Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. V+ = 5V, COSC = 0pF, unless otherwise noted. LTC1044AC SYMBOL PARAMETER IS ROUT CONDITIONS MIN LTC1044AI TYP MAX 60 15 200 MIN TYP MAX UNITS 60 15 200 A A Supply Current RL = , Pins 1 and 7, No Connection RL = , Pins 1 and 7, No Connection, V+ = 3V Minimum Supply Voltage RL = 10k l Maximum Supply Voltage RL = 10k l 12 12 V Output Resistance IL = 20mA, fOSC = 5kHz V+ = 2V, IL = 3mA, fOSC = 1kHz l l 100 120 310 100 130 325 l l fOSC Oscillator Frequency V+ = 5V, (Note 3) V+ = 2V PEFF Power Efficiency RL = 5k, fOSC = 5kHz Voltage Conversion Efficiency RL = Oscillator Sink or Source Current 1.5 5 1 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Connecting any input terminal to voltages greater than V+ or less than ground may cause destructive latchup. It is recommended that no V 5 1 kHz kHz 95 98 95 98 % 97 99.9 97 99.9 % = 0V or V+ VOSC Pin 1 (BOOST) = 0V Pin 1 (BOOST) = V+ 1.5 l l 3 20 3 20 A A 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. 1044afa For more information www.linear.com/LTC1044A 3 LTC1044A Typical Performance Characteristics 14 100 98 12 POWER EFFICIENCY (%) 6 4 1F 92 IL = 1mA 90 88 100F 86 10F 80 100 125 IL = 15mA OUTPUT RESISTANCE () OUTPUT RESISTANCE () 500 C1 = C2 = 1F 200 100 1k 10k OSCILLATOR FREQUENCY (Hz) 300 C1 = C2 = 1F C1 = C2 = 100F 200 C1 = C2 = 10F 100 0 100 100k 1k 10k OSCILLATOR FREQUENCY (Hz) 90 80 IS 50 40 40 30 30 20 20 10 10 10 PEFF 80 40 30 20 50 LOAD CURRENT (mA) 60 10 TA = 25C C1 = C2 = 10F fOSC = 1kHz 9 8 70 7 60 6 IS 50 5 40 4 30 3 20 2 10 1 0 0 0 1 4 3 2 5 LOAD CURRENT (mA) 6 7 1044a G06 70 0 300 270 PEFF 80 70 240 210 IS 60 180 50 150 40 120 30 90 20 TA = 25C C1 = C2 = 10F fOSC = 20kHz 10 0 1044a G07 0 20 80 60 40 100 LOAD CURRENT (mA) 120 SUPPLY CURRENT (mA) 70 POWER CONVERSION EFFICIENCY (%) 100 90 60 0 90 100k 100 SUPPLY CURRENT (mA) POWER CONVERSION EFFICIENCY (%) TA = 25C C1 = C2 = 10F fOSC = 5kHz 70 0 100k Power Conversion Efficiency vs Load Current, V+ = 10V 60 50 1k 10k OSCILLATOR FREQUENCY (Hz) 1044a G05 100 PEFF 1F 100 400 Power Conversion Efficiency vs Load Current, V+ = 5V 80 1F Power Conversion Efficiency vs Load Current, V+ = 2V TA = 25C IL = 10mA 1044a G04 90 86 1044a G03 C1 = C2 = 100F 0 100 88 Output Resistance vs Oscillator Frequency, V+ = 10V TA = 25C IL = 10mA 300 90 60 30 0 140 1044a G08 1044afa 4 For more information www.linear.com/LTC1044A SUPPLY CURRENT (mA) 400 100F IL = 15mA 10F 1044a G02 Output Resistance vs Oscillator Frequency, V+ = 5V C1 = C2 = 10F 10F 80 100 100k TA = 25C C1 = C2 IL = 1mA 92 82 1k 10k OSCILLATOR FREQUENCY (Hz) 1044a G01 500 94 84 1F 82 25 75 0 50 100 AMBIENT TEMPERATURE (C) 100F 96 10F 94 84 2 98 POWER CONVERSION EFFICIENCY (%) SUPPLY VOLTAGE (V) 8 100 TA = 25C C1 = C2 100F 96 10 0 -55 -25 Power Efficiency vs Oscillator Frequency, V+ = 10V Power Efficiency vs Oscillator Frequency, V+ = 5V POWER EFFICIENCY (%) Operating Voltage Range vs Temperature LTC1044A Typical Performance Characteristics Output Resistance vs Supply Voltage 2.5 TA = 25C IL = 3mA COSC = 0pF 1 2 3 0.5 0 SLOPE = 250 - 0.5 -1.0 1 2 3 4 5 6 7 8 LOAD CURRENT (mA) 2 0 -2 -4 -6 0 320 V + = 2V, fOSC = 1kHz 280 240 200 160 120 V + = 5V, fOSC = 5kHz 80 V + = 10V, fOSC = 20kHz 0 50 25 0 75 100 -55 -25 AMBIENT TEMPERATURE (C) 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) PIN 1 = OPEN 1 100 1000 10000 10 EXTERNAL CAPACITOR (PIN 7 TO GND)(pF) 1044a G15 100k OSCILLATOR FREQUENCY (Hz) PIN 1 = V + 100 10 TA = 25C PIN 1 = V + 10k 1k PIN 1 = OPEN 100 10 125 1 100 1000 10000 10 EXTERNAL CAPACITOR (PIN 7 TO GND)(pF) 1044a G14 Oscillator Frequency vs Supply Voltage V + = 10V TA = 25C 1k 100k Oscillator Frequency as a Function of COSC, V+ = 5V 1044a G13 Oscillator Frequency as a Function of COSC, V+ = 10V 10k 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) 40 1044a G12 100k 0 1044a G11 C1 = C2 = 10F 360 SLOPE = 45 -8 -10 400 OUTPUT RESISTANCE () OUTPUT VOLTAGE (V) 4 -5 10 Output Resistance vs Temperature TA = 25C fOSC = 20kHz 6 9 1044a G10 Output Voltage vs Load Current, V+ = 10V 8 -2 -4 1044a G09 10 -1 -2.0 0 SLOPE = 80 0 -3 -2.5 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) 2 1 -1.5 TA = 25C COSC = 0pF 10k 1k 0.1k 0 1 2 3 4 5 6 7 8 9 10 11 12 SUPPLY VOLTAGE (V) 1044a G16 Oscillator Frequency vs Temperature 35 COSC = 0pF OSCILLATOR FREQUENCY (kHz) 0 OUTPUT VOLTAGE (V) 100 3 1.0 OSCILLATOR FREQUENCY (Hz) COSC = 100pF TA = 25C fOSC = 5kHz 4 1.5 10 OSCILLATOR FREQUENCY (Hz) 5 TA = 25C fOSC = 1kHz 2.0 OUTPUT VOLTAGE (V) OUTPUT RESISTANCE () 1000 Output Voltage vs Load Current, V+ = 5V Output Voltage vs Load Current, V+ = 2V 30 25 V + = 10V 20 15 10 5 0 -55 -25 V + = 5V 50 100 25 75 0 AMBIENT TEMPERATURE (C) 125 1044a G17 1044afa For more information www.linear.com/LTC1044A 5 LTC1044A Test Circuit V + (5V) 1 2 + C1 10F IS 8 7 LTC1044A 3 4 EXTERNAL OSCILLATOR 6 IL RL 5 COSC C2 10F VOUT + 1044a TC Applications Information 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 V2 f C1 C2 RL 1044a F01 Figure 1. Switched-Capacitor Building Block Rewriting in terms of voltage and impedance equivalence, I= V1- V2 V1- V2 = 1 REQUIV (f *C1) 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. V1 REQUIV V2 C2 REQUIV = 1 f x C1 RL 1044a F02 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. 1044afa 6 For more information www.linear.com/LTC1044A LTC1044A Applications Information V+ (8) BOOST + 7X (1) /2 OSC OSC (7) CLOSED WHEN V + > 3V LV (6) SW2 C+ (2) C1 C- (4) VOUT (5) + SW1 1044a F03 C2 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. V+ 6I I 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 0.5A) 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). BOOST (1) V+ NC ~14pF LV (6) SCHMITT TRIGGER + C1 8 2 3 7 LTC1044A 4 100k REQUIRED FOR TTL LOGIC 6 5 1044a F04 OSC INPUT -(V +) I + 6I OSC (7) 1 C2 Figure 4. Oscillator 1044a F05 By connecting the boost pin (pin 1) to V+, the charge and discharge current is increased and hence, the frequency is increased by approximately seven times. Increasing the frequency will decrease output impedance and ripple for higher load currents. Figure 5. External Clocking 1044afa For more information www.linear.com/LTC1044A 7 LTC1044A Applications Information 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 80 resistor. The 80 output impedance is composed of two terms: 1. The equivalent switched-capacitor resistance (see Theory of Operation). 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 = 10F, the output impedance goes from 60 at fOSC = 10kHz to 200 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 8 2 3 7 LTC1044A 4 Notice that the above equation for REQUIV is not a capacitive reactance equation (XC = 1/C) and does not contain a 2 term. 10F 8 2 7 3 4 TMIN TA TMAX LTC1044A V + (1.5V TO 12V) 6 + REQUIRED FOR V + < 3V Vd 1N5817 + + 10F + VOUT = 2(VIN - 1) 10F 1044a F07 Figure 7. Voltage Doubler Ultra-Precision Voltage Divider An ultra-precision voltage divider is shown in Figure 8. To achieve the 0.002% accuracy indicated, the load current should be kept below 100nA. However, with a slight loss in accuracy the load current can be increased. + V +/2 0.002% REQUIRED FOR V + < 3V 5 TMIN TA TMAX IL 100nA C1 10F + 1 8 2 7 3 LTC1044A 4 V + (3V TO 24V) 6 5 C2 10F REQUIRED FOR V + < 6V 1044a F08 VOUT = - V + + + 1 6 5 2. A term related to the on-resistance of the MOS switches. At an oscillator frequency of 10kHz and C1 = 10F, the first term is: 1 REQUIV = (fOSC / 2)*C1 1 = = 20 3 5 *10 *10 *10 - 6 Vd 1N5817 10F Figure 8. Ultra-Precision Voltage Divider 1044a F06 Figure 6. Negative Voltage Converter 1044afa 8 For more information www.linear.com/LTC1044A LTC1044A Applications Information Battery Splitter Paralleling for Lower Output Resistance 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 (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. Additional flexibility of the LTC1044A is shown in Figures 10 and 11. + C1 10F 8 2 7 3 LTC1044A 4 6 5 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. +VB/2 (6V) REQUIRED FOR V B < 6V +VB/2 (-6V) C2 10F OUTPUT COMMON 1044a F09 Figure 9. Battery Splitter + C1 1 8 1 2 7 2 3 10F V+ LTC1044A 4 + C1 6 3 10F 5 8 7 LTC1044A 4 6 5 V OUT = -(V + ) 1/4 CD4077 + * C2 20F *THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044As TO MINIMIZE RIPPLE 1044a F10 Figure 10. Paralleling for Lower Output Resistance V+ 10F 8 2 7 3 4 LTC1044A 10F + 1 6 3 5 4 - (V + ) 10F FOR V OUT = -2V + 8 2 7 LTC1044A + + 1 FOR V OUT = -3V + 6 5 V OUT + VB 12V 1 + + 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. 10F 1044a F11 Figure 11. Stacking for Higher Voltage 1044afa For more information www.linear.com/LTC1044A 9 LTC1044A Typical Applications Low Output Impedance Voltage Converter 200k 8.2k VIN* 39k 2 7 + VOUT ADJ 50k 6 LM10 8 4 50k 200k 7 8 + 1 - 6 OUTPUT 5 100F + 3 LTC1044A 0.1F 39k 10F 1044a F12 1 2 3 4 10F *VIN |-VOUT| + 0.5V LOAD REGULATION 0.02%, 0mA TO 15mA + Single 5V Strain Gauge Bridge Signal Conditioner + 100F 1 8 2 7 LTC1044A 3 6 5 -5V 4 220 5V 100F + 4 0.33F 1.2V REFERENCE TO A/D CONVERTER FOR RATIOMETRIC OPERATION (1mA MAX) 3 D 100k 10k LT1004 ZERO 1.2V TRIM 301k* 0V *1% FILM RESISTOR PRESSURE TRANSDUCER BLH/DHF-350 (CIRCLED LETTER IS PIN NUMBER) + E 1 2k GAIN TRIM - 350 PRESSURE TRANSDUCER 5 6 C OUTPUT 0V TO 3.5V 0psi to 350psi 0.047F 46k* LT1413 A 39k -1.2V 2 8 100* + 7 - 0.1F 1044a F13 1044afa 10 For more information www.linear.com/LTC1044A LTC1044A Typical Applications Regulated Output 3V to 5V Converter 3V 200 1 8 2 7 3 5V OUTPUT 100F 6 4 10F + 5 1M 4.8M 7 1k 330k 1 REF AMP 8 - + LTC1044A 1N914 + EVEREADY EXP-30 LM10 OP AMP 2 3 + 6 - 1k 4 1N914 100k 150k 1044a F14 Low Dropout 5V Regulator 2N2219 200 + 10F VOUT = 5V 1N914 1 8 2 7 3 LTC1044A 4 12V + 6 10F 100 5 120k 100k SHORT-CIRCUIT PROTECTION 1M 6V 4 EVEREADY E-91 CELLS 2 8 5 FEEDBACK AMP V+ LOAD + - LT1013 3 + 7 - V- 4 LT1004 1.2V 1 1N914 6 30k 1.2k 50k OUTPUT ADJUST 0.01 1044a F15 VDROPOUT AT 1mA = 1mV VDROPOUT AT 10mA = 15mV VDROPOUT AT 100mA = 95mV 1044afa For more information www.linear.com/LTC1044A 11 LTC1044A Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .400* (10.160) MAX 8 7 .300 - .325 (7.620 - 8.255) 6 5 .255 .015* (6.477 0.381) .065 (1.651) TYP .008 - .015 (0.203 - 0.381) 1 2 .130 .005 (3.302 0.127) .045 - .065 (1.143 - 1.651) 4 3 ( +.035 .325 -.015 8.255 +0.889 -0.381 ) .120 (3.048) .020 MIN (0.508) MIN .018 .003 .100 (2.54) BSC (0.457 0.076) N8 REV I 0711 NOTE: 1. DIMENSIONS ARE INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .189 - .197 (4.801 - 5.004) NOTE 3 .045 .005 .050 BSC 8 .245 MIN .160 .005 .010 - .020 x 45 (0.254 - 0.508) NOTE: 1. DIMENSIONS IN 5 .150 - .157 (3.810 - 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT 2 .053 - .069 (1.346 - 1.752) 0- 8 TYP .016 - .050 (0.406 - 1.270) 6 .228 - .244 (5.791 - 6.197) .030 .005 TYP .008 - .010 (0.203 - 0.254) 7 .014 - .019 (0.355 - 0.483) TYP 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) 4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE 3 4 .004 - .010 (0.101 - 0.254) .050 (1.270) BSC SO8 REV G 0212 1044afa 12 For more information www.linear.com/LTC1044A LTC1044A Revision History REV DATE DESCRIPTION A 4/14 Changed 0.0002% to 0.002% in the Ultra-Precision Voltage Divider section PAGE NUMBER 8 1044afa 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 information circuits as described herein will not infringe on existing patent rights. For more www.linear.com/LTC1044A 13 LTC1044A Typical Application Two-Diode Capacitive Voltage Doubler VIN (1.5V TO 12V) 1 8 2 7 LTC1044A 3 4 Vd 1N5817 6 5 + REQUIRED FOR V + < 3V Vd 1N5817 + + 10F + VOUT = 2(VIN - 1) 10F 1044a TA02 Related Parts PART NUMBER DESCRIPTION COMMENTS LTC3240-3.3/ LTC3240-2.5 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter VIN: 1.8V to 5.5V, VOUT(MAX) = 3.3V/2.5V, IQ = 65A, ISD < 1A, (2mm x 2mm) DFN Package LTC3245 Wide VIN Range Low Noise 250mA Buck-Boost Charge Pump VIN: 2.7V to 38V, VOUT(MAX) = 5V, IQ = 20A, ISD = 4A, 12-Lead MS and (3mm x 4mm) DFN Packages LTC3255 Wide VIN Range 50mA Buck (Step-Down) Charge Pump VIN: 4V to 48V, VOUT(MAX) = 12.5V, IQ = 16A, 10-Lead MSOP and (3mm x 3mm) DFN Packages 1044afa 14 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LTC1044A (408) 432-1900 FAX: (408) 434-0507 www.linear.com/LTC1044A LT 0414 REV A * PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993