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Micropower comparator suits unregulated supplies

Posted: 13 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:micropower comparator? low-voltage supplies? voltage reference?

Linear Technology Corp. has announced the LT6703, a micropower comparator with an integrated 400mV voltage reference in a 2-by-2mm package. The device operates with a supply voltage of 1.4-18V, which is suitable for low-voltage or unregulated power supplies.

The comparator requires 6.5?A of quiescent current and less than 10nA of input bias current. With a total threshold error of only 1.25 percent, the LT6703 is well suited as a voltage monitor or threshold detector.In addition to its size and precision, the LT6703 is a robust part. The input can accept voltages from 0 to 18V, independent of the supply voltage, and the open collector output can be pulled up to 18V, also independent of supply. This capability allows the device to interface to a wide range of signals or to serve as a voltage level translator. Furthermore, the LT6703 has built-in comparator hysteresis and specifications from -40C to 125C to ensure operation in electrically noisy and high temperature environments.

"The wide supply voltage range and the ability to put 18V on the input or output make this tiny device suitable for industrial applications," says Brendan Whelan, design manager for Linear Technology.

Two versions provide the choice of input polarity: the LT6703-2 has the 400mV reference connected to the non-inverting input and the LT6703-3 has the 400mV reference connected to the inverting input. Both versions are in full production, with prices starting at 75 cents each in 1,000-piece quantities.

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