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A Study of Current Density Limits Due to Saturation in Thin Film Magnetic Inductors for On-Chip Power Conversion

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9 Author(s)
Herget, P. ; IBM Almaden Res. Center, San Jose, CA, USA ; Naigang Wang ; O'Sullivan, E.J. ; Webb, B.C.
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Saturation in thin film coupled magnetic inductors was measured as a function of dc current in both windings. A simple mathematical model was created to approximate the inductor saturation level in the presence of the two currents. The model was compared both to FEM calculations of saturation in a linear model and to the experimental findings. Using the mathematical model, an expression for the maximum dc current and maximum flux levels in the yokes was derived for a two phase coupled buck converter, as a function of coupling.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )