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Ferrite substrates for high-frequency switching DC-to-DC converter applications

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4 Author(s)
Kato, N. ; Fuji Electrochemical Co., Ltd., Shizuoka, Japan ; Hirano, S. ; Matsuura, H. ; Torii, M.

A hybrid IC of small capacity DC-to-DC converter was formed on a ferrite substrate which also serves as a core for inductors. The converter has characteristics of 80% in efficiency, 1.2 W/cm3in output power and a switching frequency of 500 kHz. To optimize both the magnetic property and mechanical strength of the substrate, a Ni-Cu-Zn ferrite was employed and LiO2and WO3were added to improve high mechanical strength.

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Magnetics, IEEE Transactions on  (Volume:21 ,  Issue: 5 )