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Multiphase Controller Powers AMD SVI3 CPUs in Graphics, Desktop Systems

June 3, 2025

Alpha and Omega’s dual-output eight-phase controller provides a complete power-management solution for AMD AM5 desktop and Navi44/48 graphics platforms.

Lee Goldberg

Related To:

Electronic Design

The AOZ98252QI two-output, eight-phase controller with low 2.5-mA quiescent power, developed by Alpha and Omega Semiconductor (AOS), features AMD SVI3 high-speed and SMBus digital interfaces. It’s engineered as a key component in a complete system power solution with AOS’s DrMOS products for graphics and desktop systems.

The digital controller offers flexible 8+0 to 4+4 GFX/SOC and Vcore/SOC output rails. It’s designed with the company’s Advanced Transient Modulator (A²TM), which delivers cutting-edge variable-frequency hysteretic peak current-mode control with a proprietary phase-current-sensing scheme. The A²TM feature enables designers to achieve fast response times and optimal current balance for transient and DC loads.

Built to meet the AMD SVI3 2.0 specification, it features an SMBus interface that facilitates application-specific configurations, allowing for settings to be programmed into product registers. These capabilities also reduce the need for manual solder rework during development. Programming is streamlined using the AOS graphical user interface (GUI) or a customized embedded control (EC).

Furthermore, the controller can store register settings during development and when the configuration is finalized.

The AOZ98252QI, housed in a QFN 6x6-52L package, is immediately available in production quantities with a lead time of 12-16 weeks. Unit pricing starts at $2.95 in 1,000-piece quantities.

About the Author

Lee Goldberg | Contributing Editor

Lee Goldberg is a self-identified “Recovering Engineer,” Maker/Hacker, Green-Tech Maven, Aviator, Gadfly, and Geek Dad. He spent the first 18 years of his career helping design microprocessors, embedded systems, renewable energy applications, and the occasional interplanetary spacecraft. After trading his ‘scope and soldering iron for a keyboard and a second career as a tech journalist, he’s spent the next two decades at several print and online engineering publications.

Lee’s current focus is power electronics, especially the technologies involved with energy efficiency, energy management, and renewable energy. This dovetails with his coverage of sustainable technologies and various environmental and social issues within the engineering community that he began in 1996. Lee also covers 3D printers, open-source hardware, and other Maker/Hacker technologies.

Lee holds a BSEE in Electrical Engineering from Thomas Edison College, and participated in a colloquium on technology, society, and the environment at Goddard College’s Institute for Social Ecology. His book, “Green Electronics/Green Bottom Line - A Commonsense Guide To Environmentally Responsible Engineering and Management,” was published by Newnes Press.

Lee, his wife Catherine, and his daughter Anwyn currently reside in the outskirts of Princeton N.J., where they masquerade as a typical suburban family.

Lee also writes the regular PowerBites series.