The LM4674 features independent left and right channel shutdown controls, allowing each channel to be disabled independently. SDR controls the right channel, while SDL controls the left channel. Driving either low disables the corresponding channel.

It is best to switch between ground and V_DD for minimum current consumption while in shutdown. The LM4674 may be disabled with shutdown voltages in between GND and V_DD, the idle current will be greater than the typical 0.03µA value. For logic levels between GND and V_DD bypass SD_ with a 0.1μF capacitor.

The LM4674 shutdown inputs have internal pulldown resistors. The purpose of these resistors is to eliminate any unwanted state changes when SD_ is floating. To minimize shutdown current, SD_ should be driven to GND or left floating. If SD_ is not driven to GND or floating, an increase in shutdown supply current will be noticed.