>> >> Also, I should look into creating my own inductors on 
>> >> the
>>>> PCB with bare traces.

>> >> Anyone have links to how the math is done for this, 
>> >> and
>> >> recommendations for
>> >> layouts, etc?

>> Microchip AN710, which is targeted squarely at RFID
>> applications, has good information on PCB inductors.


> Hmm, now I know where Neil comes from. However, I am not
> so sure if pure PCB traces will be good enough for normal
> DC/DC converter applications. I think a magnetic core will
> be necessary (planar core).

I suggested a few days ago that PCB coils up to about 10 uH 
were feasible,
This depends on factors such as available PCB area, track 
width, acceptable resistance, frequency and more.
If you want many watts then something else or added "planar" 
cores will be needed for sensible coil sizes, but for mW up 
to maybe a few Watts a PCB only inductor seems reasonable if 
you can use a high enough frequency etc



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