SLVSAF7C September 2010 – April 2019 TPS61251
The device is enabled by setting EN pin to a voltage above 1 V. At first, the internal reference is activated and the internal analog circuits are settled. Afterwards, the softstart is activated and the output voltage ramps up. The output voltage reaches its nominal value as fast as the current limit settings and the load condition allows it.
The EN input can be used to control power sequencing in a system with several DC-DC converters. The EN pin can be connected to the output of another converter, to drive the EN pin high and getting a sequencing of supply rails. With EN = GND, the device enters shutdown mode.