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Sensing the inductor DCR voltage can be an accurate and lossless technique of obtaining current information in DC to DC regulators. The absence of a series current sense resistor permits high currents and high efficiency designs at lower cost and higher density. Inductor DCR sensing also allows continuous monitoring of the inductor current as opposed to MOSFET drain to source resistance sensing, which usually samples the voltage information across a field-effect transistor during a small interval of time. Unlike MOSFETs, inductors can be purchased with low tolerance DCR specifications, thus increasing the overall current sense accuracy. The LM27402 is equipped with a low offset current sense comparator to handle inductor DCR current sense applications. A positive 10 uA current in series with a resistor provides a voltage offset compared to the DCR voltage to set the current limit level.
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