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TI intros two-stage current sense monitors

Posted: 02 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:current sense monitors? current measurement applications? power management?

Texas Instruments Inc. has introduced a pair of voltage-output, high-side current sense monitors with a wide common-mode input range of -16-80V. The INA270 and INA271 also feature a two-stage architecture to ease the design of circuits requiring additional filtering of the current signal. The devices are especially suited for current measurement applications in automotive, motor control, power management and battery charging.

In addition to solving the challenging problem of measuring small shunt drops residing at high common-mode voltages, filter networks can be included between the two stages of the INA270 and INA271 to preserve the buffered voltage output. As a result, no additional amplifiers are required when driving ADCs or low impedance loads.

The extended common-mode inputs of the INA270 and INA271 cover the range from automotive battery reversals at -16V to beyond automotive transient overshoot requirements at 80V. All this is available while being powered by single-supply voltages from 2.7V to 18V.

The devices also feature high accuracy (3 percent maximum error over temperature), wide bandwidth (130kHz), low quiescent current (900?A maximum) and specification over a -40C to 125C temperature range. Two gains are available: the INA270 at a gain of 14 and the INA271 at a gain of 20. Additional applications for the INA270 and INA271 include telecommunications, notebook computers, welding equipment, and test and measurement.

The INA270 and INA271 are available today from authorized distributors. The devices are available in SO-8 packages and are priced from 80 cents in 1,000-piece quantities.

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