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TPS7B4250-Q1 Vout short

Hi

Regarding shorted to another supply, what happen to Vref pin when the Vout is shorted to another supply which is higher than setting voltage and VIN?

I understand that this device has the output short proof to GND and supply. I would like to know the Vref pin behavior when it's shorted.

Our customer is concerned whether Vref is clamped by output or not when Vout is shorted. 

Regards,

Koji Hamamoto