LTC1046IN8

LTC1046 LINER | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 12

Technical content

“Inductorless” 5V to –5V Converter Generating – 5V from 5V Output Voltage vs Load Current for V+ = 5V The LTC 1046 is a 50mA monolithic CMOS switched capacitor voltage converter. It plugs in for ICL7660/ LTC1044 in 5V applications where more output current is needed. The device is optimized to provide high current capability for input voltages of 6V or less. It trades off operating voltage to get higher output current. The LTC1046 provides several voltage conversion functions: the input voltage can be inverted (V OUT = – VIN), divided (VOUT =VIN/2) or multiplied (VOUT = – nVIN). Designed to be pin-for-pin and functionally compatible with the ICL7660 and LTC1044, the LTC1046 provides 2.5 times the output drive capability. n 50mA Output Current n Plug-In Compatible with ICL7660/LTC1044 n ROUT = 35W Maximum n 300mA Maximum No Load Supply Current at 5V n Boost Pin (Pin 1) for Higher Switching Frequency n 97% Minimum Open-Circuit Voltage Conversion Efficiency n 95% Minimum Power Conversion Efficiency n Wide Operating Supply Voltage Range: 1.5V to 6V n Easy to Use n Low Cost n Conversion of 5V to – 5V Supplies n Precise Voltage Division, VOUT = VIN/2 n Supply Splitter, VOUT = – VS/2 FEATURES DESCRIPTIO U APPLICATIO SU TYPICAL APPLICATIO U , LTC and LT are registered trademarks of Linear Technology Corporation. V OSC LV VOUT BOOST CAP GND CAP LTC1046 10µF 10µF

1046 TA01

–5V INPUT LOAD CURRENT, IL (mA) OUTPUT VOLTAGE (V) 10 20 30 40

1046 TA02

ICL7660/LTC1044, ROUT = 55W TA = 25°C LTC1046, ROUT = 27W

A UGWA WU WARBSOLUTEX I T I S ORDER PART NUMBER ELECTRICAL C CHARA TERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, COSC = 0pF, unless otherwise noted. LTC1046C LTC1046I/M SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS IS Supply Current R L = ¥ , Pins 1 and 7 No Connection 165 300 165 300 mA RL = ¥ , Pins 1 and 7 No Connection, 35 35 mA V+ = 3V V+L Minimum Supply Voltage R L = 5kW l 1.5 1.5 V V+H Maximum Supply Voltage R L = 5kW l 66 V ROUT Output Resistance V + = 5V, IL = 50mA (Note 3) 27 35 27 35 W l 27 45 27 50 W V+ = 2V, IL = 10mA l 60 85 60 90 W fOSC Oscillator Frequency V + = 5V (Note 4) 20 30 20 30 kHz V+ = 2V 4 5.5 4 5.5 kHz PEFF Power Efficiency R L = 2.4kW 95 97 95 97 % VOUTEFF Voltage Conversion R L = ¥ 97 99.9 97 99.9 % Efficiency IOSC Oscillator Sink or Source V OSC = 0V or V+ Current Pin 1 = 0V l 4.2 35 4.2 40 mA Pin 1 = V+ l 15 45 15 50 mA (Note 1) Input Voltage on Pins 1, 6 and 7 Output Short Circuit Duration Operating Temperature Range WU UPACKAGE/ORDER I FOR ATIO Note 1: Absolute Maximum Ratings are those values beyond which the life of the 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 LTC1046. Note 3: ROUT is measured at TJ = 25°C immediately after power-on. Note 4: 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. LTC1046CN8 LTC1046CS8 LTC1046IN8 LTC1046IS8 LTC1046MJ8 S8 PART MARKING 1046 1046I TOP VIEW OSC LV V OUT BOOST CAP+ GND CAP– J8 PACKAGE 8-LEAD CERDIP N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 160°C, qJA = 100°C (J8) TJMAX = 110°C, qJA = 130°C (N8) TJMAX = 150°C, qJA = 150°C (S8)

EXTERNAL CAPACITOR (PIN 7 TO GND), COSC (pF) 0.1 OSCILLATOR FREQUENCY, fOSC (kHz) 100 10 100 10000

1046 G09

V+ = 5V TA = 25°C PIN 1 = OPEN PIN 1 = V+ LOAD CURRENT, IL (mA) –2.5 OUTPUT VOLTAGE (V) –2.0 –1.5 –1.0 –0.5 0.0 0.5 2 4 6 8

1046 G07

1.0 1.5 2.0 2.5 SLOPE = 52Ω TA = 25°C V+ = 2V fOSC = 8kHz C1 = C2 = 10mF LOAD CURRENT, IL (mA) OUTPUT VOLTAGE (V) 10 20 30 40

1046 G08

SLOPE = 27Ω TA = 25°C V+ = 5V fOSC = 30kHz C1 = C2 = 10mF OSCILLATOR FREQUENCY, fOSC (Hz) 100 POWER CONVERSION EFFICIENCY, PEFF (%) 100 1k 10k 100k 1M

1046 G06

V+ = 5V TA = 25°C C1 = C2 A = 100mF, 1mA B = 100mF, 15mA C = 10mF, 1mA D = 10mF, 15mA E = 1mF, 1mA F = 1mF, 15mA A C B E D F LOAD CURRENT, IL (mA) POWER CONVERSION EFFICIENCY, PEFF (%) 100 30 40 60 70

1046 G05

TA = 25°C V+ = 5V C1 = C2 = 10mF fOSC = 30kHz 100 SUPPLY CURRENT (mA) LOAD CURRENT, IL (mA) POWER CONVERSION EFFICIENCY, PEFF (%) 100 34 67

1046 G04

TA = 25°C V+ = 2V C1 = C2 = 10mF fOSC = 8kHz 891 0 SUPPLY CURRENT (mA) AMBIENT TEMPERATURE (°C) –55 OUTPUT RESISTANCE (W ) 25 50 100 125

1046 G03

–25 0 75 C1 = C2 = 10mF V+ = 2V, COSC = 0pF V+ = 5V, COSC = 0pF OSCILLATOR FREQUENCY, fOSC (Hz) 100 OUTPUT RESISTANCE, RO (W ) 200 300 400 500 1k 10k 100k

1046 G01

TA = 25°C V+ = 5V IL = 10mA C1 = C2 = 1mF C1 = C2 = 10mFC1 = C2 = 100mF CCHARA TERISTICSUWATYPICALP E RFOR CE (Using Test Circuit in Figure 1) Output Resistance vs Output Resistance vs Output Resistance vs Oscillator Frequency Supply Voltage Temperature Power Conversion Efficiency vs Power Conversion Efficiency vs Power Conversion Efficiency vs Load Current for V+ = 2V Load Current for V + = 5V Oscillator Frequency Output Voltage vs Load Current Output Voltage vs Load Current Oscillator Frequency as a for V+ = 2V for V + = 5V Function of C OSC SUPPLY VOLTAGE, V+ (V) OUTPUT RESISTANCE, RO (W ) 100 1000 25 6 7

1046 G02

TA = 25°C IL = 3mA COSC = 100pF COSC = 0pF

1046 G11

1046 G10

Figure 2. Switched Capacitor Building Block

1046 F01

1046 F02

capacitor network is as shown in Figure 3. the power efficiency starts to decrease. equal to 3V, the LV pin can be tied to ground or left floating. diagram of the oscillator circuit. Figure 3. Switched Capacitor Equivalent Circuit Figure 4. LTC1046 Switched Capacitor Figure 5. Oscillator and hence the efficiency, is set by the output impedance.

1046 F03

1046 F04

1046 F05LV

adding an external pull-up resistor (see Figure 6). are necessary to minimize voltage losses at high currents. losses will occur on both the charge and discharge cycle. low ESR (in the range of 0.1W ). Figure 6. External Clocking

1046 F06

Figure 7. Negative Voltage Converter resistance of the MOS switches.

• ± 15 10 10 10 6736 W. Notice that the equation for R EQUIV is not a capacitive reactance equation (XC = 1/w C) and does not contain a 2p term. The exact expression for output impedance is complex, but the dominant effect of the capacitor is clearly shown on

Figure 8. Voltage Doubler Figure 9. Ultraprecision Voltage Divider Figure 8 shows a two diode, capacitive voltage doubler.

1046 F07

1046 F08

in accuracy, the load current can be increased.

1046 F09

Figure 10. Battery Splitter schematically by the switch.

1046 F11

Figure 11. Paralleling for 100mA Load Current

1046 F12

Figure 12. Stacking for Higher Voltage

UPACKAGE DESCRIPTIO Dimensions in inches (milimeters) unless otherwise noted. 8-Lead CERDIP (Narrow 0.300, Hermetic) (LTC DWG # 05-08-1110) J8 1298 0.014 – 0.026 (0.360 – 0.660) 0.200 (5.080) MAX 0.015 – 0.060 (0.381 – 1.524) 0.125 3.175 MIN0.100 (2.54) BSC

0.300 BSC

(0.762 BSC) 0.008 – 0.018 0.005 (0.127) MIN 0.405 (10.287) MAX 0.220 – 0.310 (5.588 – 7.874) 12 3 4 87 65 0.025 (0.635) RAD TYP 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.023 – 0.045 (0.584 – 1.143) HALF LEAD OPTION CORNER LEADS OPTION (4 PLCS) 0.045 – 0.065 (1.143 – 1.651)NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS

8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) UPACKAGE DESCRIPTIO Dimensions in inches (milimeters) unless otherwise noted. N8 1098 0.100 (2.54) BSC 0.065 (1.651) TYP 0.045 – 0.065 (1.143 – 1.651) 0.130 – 0.005 (3.302 – 0.127) 0.020 (0.508) MIN0.018 – 0.003 (0.457 – 0.076) 0.125 (3.175) MIN 12 3 4 87 6 5 0.255 – 0.015* (6.477 – 0.381) 0.400* (10.160) MAX 0.009 – 0.015 (0.229 – 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.325 +0.035 –0.015 +0.889 –0.3818.255() *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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. UPACKAGE DESCRIPTIO Dimensions in inches (milimeters) unless otherwise noted. 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.016 – 0.050 (0.406 – 1.270) 0.010 – 0.020 0°– 8° TYP 0.008 – 0.010 (0.203 – 0.254) SO8 1298 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) TYP 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 1 2 3 4 0.150 – 0.157** (3.810 – 3.988) 8 7 6 5 0.189 – 0.197* (4.801 – 5.004) 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

ª LINEAR TECHNOLOGY CORPORATION 1 991 1046fa LT/TP 1099 2K REV A • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear-tech.com RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1044A 12V CMOS Voltage Converter Doubler or Inverter, 20mA I OUT, 1.5V to 12V Input Range LT

1054 Switched Capacitor Voltage Converter with Regulator Doubler or Inverter, 100mA I OUT, SO-8 Package

LTC1550 Low Noise, Switched Capacitor Regulated Inverter <1mV P-P Output Ripple, 900kHz Operation, SO-8 Package LT1611 1.4MHz Inverting Switching Regulator 5V to –5V at 150mA, Low Output Noise, SOT-23 Package LT1617 Micropower Inverting Switching Regulator 5V to –5V at 20 mA Supply Current, SOT-23 Package LTC1754-5 Micropower Regulated 5V Charge Pump in SOT-23 5V/50mA, 13 mA Supply Current, 2.7V to 5.5V Input Range