LTC1144 Linear Technology, LTC1144 Datasheet
LTC1144
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LTC1144 Summary of contents
Page 1
... V . The SHDN pin reduces supply current and can be used to save power when the converter is not in use. The LTC1144 contains an internal oscillator, divide-by- two, voltage level shifter, and four power MOSFETs. A special logic circuit will prevent the power N-channel switch substrate from turning on. ...
Page 2
... Indefinite + V 15V ........................................................ 30 sec + V 20V ............................................. Not Protected Power Dissipation ............................................. 500mW Operating Temperature Range LTC1144C................................................ LTC1144I ............................................ – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C ELECTRICAL C HARA TERISTICS 15V 0pF Test Circuit Figure 1, unless otherwise noted. ...
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... Power Conversion Efficiency and Supply Current vs Load Current 100 P EFF 25° 15V BOOST = OPEN (SEE TEST CIRCUIT 100 LOAD CURRENT (mA) LTC1144 • TPC09 LTC1144 • TPC03 LTC1144 • TPC06 100 ...
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... Output Voltage vs Load Current 15V T = 25° BOOST = 15V BOOST = OPEN –5 0 –10 –15 100 0.001 0.01 0.1 1 LOAD CURRENT (mA) LTC1144 • G14 + pin or leave floating 10 100 LTC1144 • TPC12 0 100 LTC1144 • TPC15 ...
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... A PPLICATI S I FOR ATIO Theory of Operation To understand the theory of operation of the LTC1144, a review of a basic switched-capacitor building block is helpful. In Figure 2, when the switch is in the left position, capacitor C1 will charge to voltage V1. The total charge on C1 will C1V1. The switch then moves to the right, discharg- ing C1 to voltage V2 ...
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... OSCILLATOR FREQUENCY (kHz) Figure 5. Power Conversion Efficiency and Output Resistance vs Oscillator Frequency SHDN (Pin 6) The LTC1144 has a SHDN pin that will disable the internal oscillator when it is pulled low. The supply current will also drop OSC (Pin 7) and Boost (Pin 1) The switching frequency can be raised, lowered or driven from an external source ...
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... LTC1144 ±0.002 MAX 100nA L Figure 10. Ultra-Precision Voltage Divider LTC1144 –V – OUTPUT COMMON Figure 11. Battery Splitter V = 2(V – 1) OUT IN 1144 F09 1144 F10 / 1144 F11 7 ...
Page 8
... With a 0mA to 5mA load current, the R Paralleling for Lower Output Resistance Additional flexibility of the LTC1144 is shown in Figure 13. Two LTC1144s are connected in parallel to provide a lower effective output resistance. However, if the output resis- tance 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 ...