A device’s quiescent current, or IQ, is an important but often misused parameter for low-power, high-performance designs. In many battery-powered applications, the current drawn by the battery during light-load or no-load standby conditions determines the total system run time. In integrated switching converters, IQ is only a fraction of this battery current. This article defines IQ, explains how to measure it, explains what IQ is and when it should not be used, and explains some design considerations for using IQ while avoiding common measurement errors. This article applies to all Texas Instruments (TI) TPS61xxx, TPS62xxx, or TPS650xx devices.
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