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Intersil integrated FET DC/DC converters

Posted: 05 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:integrated FET DC/DC converter? PCB layout? step-down converter?

The purpose of this application note is to show how the Intersil integrated FET DC/DC converters can make the task of designing an embedded step-down (buck) DC/DC converter much easier. Most of the difficult design decisions are included in the regulator chip, such as FETs, current sense elements, loop compensation, current limiting, and over temperature protection. By using fixed inductor and capacitor values, their selection process is eliminated. FETs are internal so their characteristics and internal connections are optimized for the design. High frequency switching up to 1.5MHz allows the use of very small inductors and capacitors. Finally, there are evaluation boards and recommended PCB layouts for most of the Intersil integrated FET DC/DC converters.

This application note will also share simple test circuits to quickly evaluate loop stability without the headaches of Bode plots and phase margin measurements. The correct technique for connecting an oscilloscope probe to measure output noise will be shown with actual scope photos of good and bad probing techniques. To minimize the difficulty of sequencing multiple power supplies, a simple circuit for tracking the output voltages with a common ramp circuit will be shown.

Please view the PDF document for more information.

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