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Current-sense amps draw less power

Posted: 03 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:semtech? current sense amplifier? sc310?

Semtech Corp. said this family of high-side current sense amplifiers with voltage flexibility and power saving features will allow mobile device designers to lower the system cost and power draw needed for battery sensing or data acquisition applications.

The SC310 family takes voltage input from a sense resistor and converts it to a low-impedance, low-voltage signal that can be fed into a battery charging IC for monitoring battery levels, or into other power regulation or monitoring ICs.

The device has a wide temperature range that makes it suited for industrial applications, and features an industry best accuracy level of 1 percent (typical) that ensures that the sensing IC receives the most accurate information, said Larry King, Semtech's vice president of portable power management.

There are SC310 models available in 20-, 50- and 100V gain levels, which enable the flexibility to specify a wide range of sense resistors and analog-to-digital converters (A/D converters) needed for a complete solution. Further enhancing the low power draw of the SC310 is the availability of a shutdown pin that can be programmed to disable the device into a low quiescent current state without the input voltage being removed. The devices tout a 270?A supply current.

The SC310 features a 2.7V to 25V common mode input range for use in many applications, including mobile device or laptop battery monitoring to industrial data acquisition. Output range is independently adjustable from 3V to 25V to match the voltage levels of the sensing IC.

Ordering codes are SC310ASKTRT for the 20V version, SC310BSKTRT for the 50V version, and SC310CSKTRT for the 100V version.

The SC310, packaged in a SOT23-6, is available now in production quantities for 82 cents each in 1,000-piece lots.

- Bettyann Liotta


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