Eur. Phys. J. Appl. Phys. (2013) 63: 14408
https://doi.org/10.1051/epjap/2013120484

PwrSoC (integration of micro-magnetic inductors/transformers with active semiconductors) for more than Moore technologies^*

Microsystems Center, Tyndall National Institute, University College Cork, Dyke Parade, Cork, Ireland

^a e-mail: cian.omathuna@tyndall.ie

Received: 22 October 2012
Accepted: 9 April 2013
Published online: 5 July 2013

Abstract

This paper introduces the concept of power supply on chip (PwrSoC) which will enable the development of next-generation, functionally integrated, power management platforms with applications in dc-dc conversion, gate drives, isolated power transmission and ultimately, high granularity, on-chip, power management for mixed-signal, SOC chips. PwrSoC will integrate power passives with the power management IC, in a 3D stacked or monolithic form factor, thereby delivering the performance of a highefficiency dc-dc converter within the footprint of a low-efficiency linear regulator. A central element of the PwrSoC concept is the fabrication of power micro-magnetics on silicon to deliver micro-inductors and micro-transformers. The paper details the magnetics on silicon process which combines thin film magnetic core technology with electroplated copper conductors. Measured data for micro-inductors show inductance operation up to 20 MHz, footprints down to 0.5 mm², efficiencies up to 93% and dc current carrying capability up to 600 mA. Measurements on micro-transformers show voltage gain of approximately – 1 dB at between 10 MHz and 30 MHz.