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LTC1044A

Linear Technology
Part Number LTC1044A
Manufacturer Linear Technology
Description 12V CMOS Voltage Converter
Published Mar 22, 2005
Detailed Description LTC1044A 12V CMOS Voltage Converter Features n 1.5V to 12V Operating Supply Voltage Range n 13V Absolute Maximum Rati...
Datasheet PDF File LTC1044A PDF File

LTC1044A
LTC1044A


Overview
LTC1044A 12V CMOS Voltage Converter Features n 1.
5V to 12V Operating Supply Voltage Range n 13V Absolute Maximum Rating n 200µA 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 IS = 1.
5µA with 5V Supply When OSC Pin = 0V or V+ n High Voltage Upgrade to ICL7660/LTC1044 Applications n Conversion of 10V to ±10V Supplies n Conversion of 5V to ±5V Supplies n Precise Voltage Division: VOUT = VIN/2 ±20ppm n Voltage Multiplication: VOUT = ±nVIN n Supply Splitter: VOUT = ±VS/2 n Automotive Applications n Battery Systems with 9V Wall Adapters/Chargers Description The LTC®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.
5µA 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 Generating –10V from 10V LTC1044A 1 BOOST V+ 8 + 10µF 2 CAP+ 3 GND OSC 7 LV 6 4 CAP– VOUT 5 1044a TA01a 10V INPUT –10V OUTPUT 10µF + OUTPUT VOLTAGE (V) Output Voltage vs Load Current, V+ = 10V 0 –1 TA = 25°C C1 = C2 = 10µF –2 –3 –4 –5 –6 SLOPE = 45Ω –7 –8 –9 –10 0 10 20 30 40 50 60 70 80 90 100 LOAD CURREN...


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