GaAs Power Devices and Modules

Authored by: Mona M. Hella , Patrick Mercier , Krzysztof Iniewski

Power Management Integrated Circuits

Print publication date:  May  2016
Online publication date:  May  2016

Print ISBN: 9781482228939
eBook ISBN: 9781482228946
Adobe ISBN:

10.1201/b20089-8

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Abstract

Innovations in low-voltage (<50 V) power electronic systems are driven by the requirements of high-energy efficiency, bandwidth, size, and cost, mainly in the portable electronics domain. In a typical handheld system, like a smartphone, there are different domains with varying power requirements like audio, displays, lighting, communication circuits, and processors. As the output voltages of the integrated circuit reduce, the power conversion circuit needs to have tighter specifications for the voltage set point, lower voltage ripple, faster transient response, and reduced noise. Routing the power to subsystem from a central power conversion unit results in higher line voltage variations and increased noise. Increasingly, the power conversion circuits are placed in close proximity to the load to cater to the load requirements (point of load [POL]). It is advantageous to integrate the POL converter along with the load as a system-on-chip or a system-in-package (SiP) implementation to reduce the form factor. The POL approach, therefore, requires the size of the power conversion circuit to be kept to a minimum for the sake of integration. The key factor to integrating a switch mode voltage regulator on chip or on package is the size of the energy storage components. In a typical switch mode DC–DC converter, the bulkiest component is typically the inductor. The key to reducing the inductor size is increasing the switching frequency of the DC–DC converter.

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