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TPS74401: TPS74401 Vout error

Part Number: TPS74401
Other Parts Discussed in Thread: TPS53355,

TPS74401  Implementing two functions   1、Vin=1.2V Vout=0.8V,2、Vin=2.5V  Vout=1.8V,1.2V  and  2.5V  are  convert  by  12V,use  TPS53355  。After  welding ,power up ,I found Vout=Vin,and I set EN LOW,Vout =0,and  the   resistance  between  Vin  and Vout  is not  zero,Note that the device is not burned. Can you  find out  the reason  form  the  sch of  TPS53355  and  TPS74401?