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Design News, February 2013

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Introducing Allegro's Smallest Integrated Current Sensor IC For Low Side or < 100 V Sensing Applications A 30-Amp current sensor IC in a 3-millimetre square package! Current Transformer Sense Resistor Op-Amp Allegro Solution Allegro's new ACS711 is quite possibly the world's smallest integrated current sensor IC. Designed for low-side or <100 V sensing applications, the new device can sense up to 30 Amps continuous current, yet is housed in a 0.75 mm low-profile QFN package measuring only 3 mm × 3 mm. The internal conductor resistance is only 0.6 milliohms: much lower than the sense resistors used in most current sensing configurations. The Allegro sensor IC employs the Hall-effect to measure the current flowing into and out of the package, making it immune to variations in conductor resistance due to temperature. The fully integrated sensor allows Allegro to program the amplifier gain and offset to produce a solution that is more accurate than a sense resistor op-amp combination. The advances integrated into this micro-packaged ACS711 means that it can deliver the smallest current sensor footprint available for user applications while at the same time reducing resistive power loss by an order of magnitude, all without compromising sensing accuracy over temperature. www.allegromicro.com/camp1175 115 Northeast Cutoff, Worcester, Massachusetts 01606 USA 508.853.5000

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