Hello, I am trying to calculate the power usage of the ADSP-BF54x processors.

Does any one know the efficiency of the internal regulator?

Alternatively does anyone know how to calculate this value? I don't have a physical device to measure.

I am also interested in the efficiency of the ADSP-BF52x range as well.

Thanks

Efficiency would vary with load as well as component (FET) selection. In general, a good "ballpark" estimate for the regulator would be about 75%, though that number drops to 50% or so at very low loads (below 50mA).