This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CSD95378BQ5M: Over voltage protection

Part Number: CSD95378BQ5M
Other Parts Discussed in Thread: TPS40428

Hello

is a design with the tsp40428 I gave an input voltage of 5.25 to the converter and the power stage vdd.

after start up the output voltage (0.85)fell and would not start again . It would reach the voltage and then fall.

After trying to find the source of the problem I noticed the input voltage rise a little bit after the startup( the startup current fell to normal load) 

even though the input didn’t rise above 5.35 the part seemed to go into over voltage protection. 
I suspect the problem is the power stage since the converter is good to 20v input .

When lowering the input voltage to 5.1 all works well …

is this a known problem ? 
why did go into over voltage protection when the maxim working voltage is 5.5v