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Forum: µC & Digital Electronics Supply microcontroller from switching buck-converter unsing battery power


von VV V. (vivi)


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Hi,

I want to use a buck-converter for converting my battery voltage to a 
voltage usable by a microcontroller. My question is if I need anything 
between the buck-converter and the micrcontroller to reduce noise (e.g. 
ferrit bead or LC-filter).
I am using TPS82740B as Converter.

Thanks a lot

: Moved by Moderator
von Jens M. (schuchkleisser)


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Usually not, except if you're using analog circuitry.

von EH H. (embeddio)


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Use a LDO if you want low noise, especially if you want to supply a 
microcontroller.

von Frederic S. (Guest)


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Consider the datasheets and compare the ripple from the Switching 
regulator to the maximum allowable ripple for the microcontroller.

An LDO is not necesarry in most cases, but will a secure solution to 
avoid proplems (if equipped with capacitiors according to the 
datasheet).

Make shure to  have enough capacitors near to the switching regulator 
and (espacially 100nF ceramic) near to the microcontroller.

Frederic

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