AnsweredAssumed Answered

Input capacitors on unused rails

Question asked by electricar on Jan 27, 2017
Latest reply on Mar 17, 2017 by Diego Adrian Cuevas

Hello,

 

is it necessary to connect decoupling capacitors on the inputs of the PMIC if the corresponding outputs are not used?

E.g. if I don't use the SW1A buck converter, do I have to put a decoupling capacitor at SW1AIN?

And if yes, do I have to connect it to a voltage rail or can it let be floating?

 

The same applies to unused LDOs (VGENs) and VINREFDDR and VHALF. What should I do with the inputs and outputs if they are not used?

 

Thank you very much in advance.

 

Kind regards

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