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.
- DC superimposition characteristics
- DC-to-DC converter
- amorphous Fe-B-Si-C magnetic flake
- planar inductor
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering