Re: [Gumstix-users] Gumstix Battery Power...

[pvm <pvm...@gm...>]

Chuck Randall wrote:
> 
> Do you really need to stick with Lithium? We are considering 4.8V  
> NiMH battery packs, such as these:
> http://www.batteryspace.com/index.asp?PageAction=VIEWCATS&Category=471
> 

I read that lithium polymer is the best power to weight ratio and weight is
an issue for me.  I was also just reading the data sheet of a component I'm
interfacing the Gumstix with.  it operates between 2.8v and 5v but, if you
provide it below 5v then performance is reduced.  Does anyone have
experience with how bad the RF interference and line ripple is with a
switching vreg?  I know there are things you can do to reduce the ripple but
can you shield from the RF with an metal enclosure?  Then again if instead I
used a linear vreg 7.2 -> 5v doesn't seem like that big a drop so might the
heat produced be minimal and that would avoid the ripple and RF problem.

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