3.3V DC-DC converter output goes to 3.9

[sudil99]

I need 3.3V to run a wifi module RN131.
It has maximum supply of 3.7V. But the simulation of my DC-DC converter design shows that the voltage goes up to 3.9V and then comes down to 3.3V. Can this 3.9V damage the module?
View attachment LTC3429.zip

 

[goldsmith]

Dear sudil
Hi
Why you don't use LM2576 ? it's drift is pretty low !
Best Wishes
Goldsmith

 

[mtwieg]

If it exceeds the rated absolute max of the module, then you should assume it will cause damage. The LTC3429 says it has a soft start function, so it shouldn't overshoot. Try running the simulation with a small load, or a larger output capacitor, and see if it still overshoots.

 

[sky_123]

Maybe stick a load on the end and then try the simulation, in case it makes a difference?
What simulator is it, by the way?

EDIT - sorry our posts were at the same time!

 

[dick_freebird]

Overshoot has to do with feedback loop dynamics, most
likely. Or that a soft-start component has a crazy low
value, or output filter is way too small.