Olin Lathrop wrote:
> Martin wrote:
>   
>> I currently have an LDO on board with a rather large aluminum
>> electrolytic as the output cap because ceramics supposedly have too
>> small an ESR.
>> So I was thinking: why couldn't I have a 'longish' trace shaped in
>> such a way that it isn't inductive, provides an extra 60 milliohms
>> resistance, and allows me to use an 0805 10uF ceramic cap on the
>> output?
>>     
>
> Or use a better LDO that can handle 0 ESR caps.  I like the MCP1700 as long
> as the input voltage doesn't exceed 6V, which can be easily arranged if
> you've got a switching preregulator.  The MCP1702 allows higher input
> voltages and is also stable down to 0 ESR output cap, but costs more and has
> a higher dropout voltage.
>
>   

I should have specified that my input voltage is up to 14v which is why
I have a very limited choice in regulators having a low quiescent
current. An LDO isn't specifically necessary it's just that it's much
more efficient (by orders of magnitude) than the 7805. I am using the
LP2981 at the moment.
Thanks for the advice.

-
Martin
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