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Technical Lecture

Point-of-Load (POL) and Multi-Phase Converters

T09.3 - Fully Integrated Voltage Regulators (FIVRs) with Package In-Situ Coupled CoaxMIL Inductor for High Power Density Microprocessor Applications

Wednesday, March 19, 2025
9:10 AM – 9:30 AM ET
Location: Level Three, A302
CoaxMIL inductors are the latest package in-situ inductors with a high ratio of inductance to resistance for fully integrated voltage regulators (FIVRs). However, it is challenging to achieve both high efficiency and density due to the fundamental performance trade-off of inductors. This digest introduces a coupled package integrated coaxial magnetic inductor (CoaxMIL-C), which improves form factor while performance is maintained. By adding phase coupling to CoaxMIL structures, the proposed CoaxMIL-C reduces the inductor size by 33% and improves the transient performance while maintaining the efficiency of conventional CoaxMIL inductors. Performance is verified with VNA measurements and validated with a FIVR test bench with external inductor pads. CoaxMIL-C provides 24 A/mm2 maximum density and enables the FIVR to achieve 89% peak efficiency at 1.75 V to 0.75 V conversion.