Preventing Excess Current Consumption on Analog Switches

Analog switches are extensively used for switching audio signals in battery-powered applications, such as mobile phones. In many cases, the switch is powered directly from the battery, but it receives control signals from a lower voltage processor GPIO. For most analog switches, this application condition leads to an excess supply current draw that catches system designers by surprise. This application report explains the cause of this excess current consumption and describes solutions to address it effectively.