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 with a shutdown current of typically 50 nA. In shutdown mode, the internal power switches and the entire control circuitry are turned off. An internal switch smoothly discharges the output through the VOUT pin in shutdown mode. Do not leave the EN pin floating.

The typical threshold value of the EN pin is 0.89 V for rising input signal, and 0.62 V for falling input signal.