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Powering CoolRunner-II CPLDs

Posted: 25 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:linear vs. switching regulators? CoolRunner-II CPLDs? power conversion?

There are two main categories of regulatorslinear and switching. The linear regulator is perhaps the most basic building block of every power supply used in the industry. These are incredibly easy to use and are usually the least expensive solution. Additionally, linear regulators are the least noisy of the various types of regulators.

Switching regulators, on the other hand, are gaining popularity because they offer both higher power conversion efficiency and the flexibility of having multiple output voltages derived from a single input voltage source. In addition, while linear regulators can only provide an output voltage that is lower than the input voltage, switching regulators can create output voltages that are higher than the input voltages.

There is not a single answer for which type of regulator should be used, as the selection depends upon the specific application. Each regulator type has inherent advantages and disadvantages. This application note will attempt to simplify regulator selection.

Frequently, the power voltage applied to a board is higher (or lower) than the nominal 1.8V VCCINT level required by CoolRunner-II CPLDs. In these situations, power ICs are commonly used to perform the required DC-to-DC conversion of the power voltage. These devices, known as regulators, take an unregulated input voltage and provide a regulated output voltage independent of input voltage variations or output current fluctuations. Many different types of regulators exist. This application note will provide an explanation of each regulator type and present some typical circuits to highlight currently available commercial regulators.

View the PDF document for more information.





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