LTC660 Linear Technology, LTC660 Datasheet
LTC660
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LTC660 Summary of contents
Page 1
... A higher frequency outside the audio band can also be obtained if the BOOST pin is tied + The LTC660 contains an internal oscillator, divide-by-two, voltage level shifter and four power MOSFETs. , LTC and LT are registered trademarks of Linear Technology Corporation INPUT ...
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... Note 2: Connecting any input terminal to voltages greater than V than ground may cause destructive latch-up recommended that no inputs from source operating from external supplies be applied prior to power-up of the LTC660. Note 3: The output resistance is a combination of internal switch resistance and external capacitor ESR. To maximize output voltage and efficiency, keep external capacitor ESR < ...
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... Supply Current vs Supply Voltage 300 250 200 150 + BOOST = V 100 BOOST = OPEN 50 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE (V) LTC660 • G01 Output Resistance vs Supply Voltage BOOST = OPEN SUPPLY VOLTAGE (V) LTC690 • TPC04 ...
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... Temperature BOOST = OPEN OSC = OPEN 0 5.0 5.5 –60 –40 – TEMPERATURE ( C) Oscillator Frequency vs External Capacitance + BOOST = V BOOST = OPEN 1 10 100 1000 10000 CAPACITANCE (pF) LTC660 • TPC17 = 1mA 100 LTC660 • TPC12 80 100 120 140 LTC660 • TPC15 ...
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... Same except standard logic levels will not be able to overdrive OSC pin. Positive Voltage Output LTC660 150 150 F + Figure 1. Test Circuit LTC660 for all input voltages. OUT EXTERNAL OSCILLATOR OSC OUT LTC660 • F01 5 ...
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... For ex- ample, if you examine power conversion efficiency as a function of frequency this simple theory will explain how the LTC660 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/fC1 term and voltage losses will rise decreasing the efficiency ...
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... This means using a capacitor with 1 increasing the output impedance of the LTC660 This represents a significant increase in the voltage losses. For C2 the effect of ESR is less dramatic with 1 of ESR will increase the output impedance by 1 ...
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... N Voltage Doubling Figure 8 shows the LTC660 operating in the voltage doubling mode. The external Schottky (1N5817) diode is for start-up only. The output voltage is 2 • V load. The diode has no effect on the output voltage. + ...
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... OUTPUT COMMON LTC1046 • TA10 Stacking for Higher Voltage Figure 12 makes use of “stacking” two LTC660s to provide even higher voltages. In Figure 12, a negative voltage doubler or tripler can be achieved depending upon how Pin 8 of the second LTC660 is connected, as shown schematically by the switch ...
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... LTC660 PACKAGE DESCRIPTION 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm Dimensions in inches (millimeters) unless otherwise noted. ...
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... TYP 0.014 – 0.019 (0.355 – 0.483) LTC660 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1 ...
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... Highest Current 6V 9.5V Lowest Cost 13V 20V Highest Voltage 16V Adjustable Output 6V 12V Fixed Output 9V – 4V, – 4.5V and Adjustable Outputs V IN 1. –V OUT IN LTC660 • F07 OUT IN C2 150 F LTC660 • F08 LT/GP 0598 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 ...