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How to apply high frequency DC/DC converters in portable designs

Posted: 13 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? portable application? frequency switching? application note?

Portable designs powered from one Li-ion battery embed more and more regulators to supply digital ICs. Complex power management are used in mobile phones but additional single output converters are often needed to supply additional phone features or many other applications like MP3 players, digital cameras, wireless and DSL modems or USB powered devices that cannot be powered by the main Power IC.

Popular core voltages have dropped to 1.8V, 1.5V, 1.3V, and even 0.9V, in the meantime typical I/O voltages have dropped from 3.3V to 2.5V or 1.8V. Consequently, to maintain high efficiency with low output voltages, designers must select buck converter architecture instead of linear regulators.

This powerful solution seems easy to integrate; however, a specific attention has to be kept in design to get a very efficient solution with a fast switching frequency. External parts requirements and board layout recommendations will be tackled in this document.

View the PDF document for more information.

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