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Endo Y.,Tohoku University | Sato H.,Tohoku University | Miyazaki T.,Tohoku University | Yamaguchi M.,Tohoku University | And 7 more authors.
2015 IEEE International Magnetics Conference, INTERMAG 2015 | Year: 2015

Electronic products such as phone handsets and table PC have been highly-miniaturized, and their functionality and performance have increased. In particular, high power density integrated passives accelerate industrial and consumer applications of one-chip DC-to-DC converters, since the converters which are closer to the load were required in order to minimize efficiency losses and reduce the effects of interconnect parasitics[1]. Herein, this paper reports the electric performances of a planar toroidal inductor with Fe-system magnetic flake composites integrated to a test SiP converter. The proposed inductor with the magnetic flake composite offers 1-10 W solution in the frequency range between 1-10 MHz and can be thinner than bulky ferrite inductors while thicker than sputter-deposited thin film inductors because of thick film composite structure of an amorphous Fe-B-Si-C magnetic flakes with high saturation magnetization (1.64 Tesla). © 2015 IEEE. Source


Endo Y.,Tohoku University | Sato H.,Tohoku University | Miyazaki T.,Tohoku University | Yamaguchi M.,Tohoku University | And 7 more authors.
IEEE Transactions on Magnetics | Year: 2015

This paper describes the design, fabrication, and electric performances of planar inductors with Fe0.76B0.12Si0.04C0.08 (Fe-B-Si-C) flakes composite. These inductors were designed with the help of an analytical magnetic circuit calculation, a finite-element method electromagnetic field simulator, and the Jiles-Atherton hysteresis model with the segmentation model so as to attain the desired inductance of 0.5μ H and dc resistance of 100 mΩ. To verify the simulation results, the planar inductors with Fe-B-Si-C flake composite were fabricated, and their electric performances were investigated. The inductance of the fabricated inductor is 4-4.5 times as high as that of the air-core inductor. The dc superimposed inductance at 1 MHz with output current of 1.4 A is ∼ 0.58μ H, which is only 17% less than the no-load inductance. Therefore, the fabricated planar inductors meet all of the required electric performances. In addition, the maximum efficiency reached 91.7% for 4 V input and 3 V output of a system in package dc-to-dc converter integrated with the inductor and a CMOS IC. © 1965-2012 IEEE. Source

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