器件的静态电流即 IQ 是进行一个低功耗、高效能设计时很重要但却常常被误用的参数。许多电池供电型应用中,轻负载或者无负载待机状态下,电池提供的电流决定了系统的总运行时间。在集成开关转换器中,IQ 仅为该电池电流的一部分。本文将介绍 IQ 的定义,说明其测量方法,介绍何谓 IQ 以及不应使用它的情况,并说明避免常见测量误差的同时如何使用 IQ 的一些设计考虑。本文适用于所有德州仪器(TI)TPS61xxx、TPS62xxx 或者 TPS650xx 器件。
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