PMBus Gives Designers New Options For Meeting Adaptive Voltage Scaling Requirements

by Peter James Miller, Texas Instruments, Manchester, N.H., How2Power Today, Mar 13 2015

Focus:
While adaptive voltage scaling (AVS) has been around for more than two decades, it has severely limited a designer’s choice of power solutions. Today, an emerging, open-source serial communications protocol known as PMBus is opening new possibilities for flexibility in power design. This article looks at how PMBus can enable digital system and power designers to realize their AVS power needs. After providing some background information on AVS and PMBus, it explains the basics of how to implement an AVS solution using the PMBus communications protocol, both with the standard VOUT_MODE and VOUT_COMMAND commands and using manufacturer-specific commands.

What you’ll learn:

• How to implement an adaptive voltage scaling solution using the PMBus communications protocol

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