LT8642S - Enable Pin

Hi,

Is there a requirement that the EN pin of the LT8642S must be stable before VIN is applied? I am simulating a 1V, 6A regulator circuit using LTSPICE and I see that if the EN pin is not Up before applying VIN, the regulator does not produce any output. If I generate EN signal before VIN signal, the regulator functions correctly. 

Is this the issue with Simulation or does the chip really behaves this way?

Please find the simulation file below

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