Demonstration of a High-Inductance, High-Density, and Low DC Resistance Compact Embedded Toroidal Inductor for IVR

Next-generation high-performance computing (HPC) platform requires to run at higher speed with higher power consumption levels. Integrated voltage regulators (IVR) with a conversion ratio of 12 V to 1 V can help to reduce the power distribution network (PDN) impedance, increase the voltage conversion efficiency, and increase the regulation bandwidth. In this work, we present a new package embedded inductor array for multi-phase IVRs with a DC resistance as low as 22.8 mΩ. Inductors with three magnetic materials are demonstrated. With one material a small signal inductance as high as 475 nH is obtained, suitable for 12 V to 1 V conversion at 2 MHz. Another material gives an inductance of 192 nH suitable for 12 V to 1 V IVRs at 5 MHz. Each inductor occupies less than 6.25 mm
²
and are built with 400 μm thick metal polymer composite magnetic sheets. The metric effective AC resistance per unit inductance or R
_acx
is used to predict the inductor performance.