8.3.2 Enable

The device is enabled by setting the EN pin to high. During the start-up time (t_{Start up}), the internal circuits are settled and the soft-start circuit is activated. The EN input can be used to control power sequencing in a system with various DC-DC converters. The EN pin can be connected to the output of another converter, to drive the EN pin high and sequence supply rails. With EN pin = GND, the device enters shutdown mode in which all circuits are disabled. In fixed-output voltage versions, the internal resistor divider network is then disconnected from FB pin.