Inductors are normally rated by current, not power.  Calculate max=20
inductor current, and see if  I^2 * DC resistance of the inductor is=20
less than 1/2 watt.  If it is, you will probably be OK.  That assumes=20
that the inductor won't saturate at less than it's rated dissipation.

Kerry



V G wrote:
> Hey all,
>
> So I looked through the datasheet for the LTC3112 chip (
> http://cds.linear.com/docs/Datasheet/3112f.pdf) and went to my local
> electronics store (for those interested, the one on College st near U of =
T).
> I bought a 4.7 uH inductor but they only carried those with 1/2 watt rati=
ng.
> I bought it anyway.
>
> I'm wondering if the power rating on this inductor is sufficient for this
> chip supplying 1 Amp at 5 Volts from a 4.2 - 5.8 Volt supply.
>
> I looked through the datasheet and the section on selecting an inductor
> didn't comment on the power rating.
>  =20



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