MICROPOWER_POSITIVE_TO_NEGATIVE_CONVERTER

Published:2009/7/13 1:49:00 Author:May | From:SeekIC

Switched capacitor voltage converters are a convenient way to generate a local negative supply for biasing special circuitry, but have been limited by CMOS processes to 10 V of supply or less. The LTC1144 voltage converter overcomes this limitation, extending the maximum input voltage to 20 V. Still, the part retains the low power of CMOS operation. The LTC1144 circuit shown here generates a negative supply voltage of -13.8 V typ. (-12.6 Vmin) from a 15-V input at a maximum load current of 20 mA. Higher load currents are possible at slightly lower output voltages. The low-cost circuit includes two surface-mount capacitors, minimizing board space. A supply current of 1.2 mA (max.) results in high conversion efficiency, while just 8 μA of supply current is consumed in shutdown, making the LTC1144 excellent for use in battery-powered systems.



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