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?