The device is enabled by setting the EN pin to a logic high. Accordingly, shutdown mode is forced if the EN pin is pulled low. In shutdown mode, the internal power switches as well as the entire control circuitry are turned off. An internal switch smoothly discharges the output through the VOS pin in shutdown mode. Do not leave the EN pin floating.

The typical enable threshold value of the EN pin is 0.66 V for rising input signals and the typical shutdown threshold is 0.52 V for falling input signals.