Integrated Voltage Regulator Efficiency Improvement using Coaxial Magnetic Composite Core Inductors

The package integrated inductors employed by Intel's Fully Integrated Voltage Regulator (FIVR) have had to scale in tandem with the circuits they power. This reduction in available volume has resulted in degraded inductor quality factor and reduced conversion efficiency. In this work, a novel coaxial magnetic composite core inductor, called Coax MIL, is described. Coax MIL dramatically improves inductor performance and quality factor. This improvement in inductor metrics translates to reduced ripple current and enhanced efficiency.