Power Supply for XC5VLX85 FPGA

At power.ti.com there is a processor power search.  http://focus.ti.com/analog/docs/refdesignovw.tsp?familyId=64&contentType=2&genContentId=34815 is for your processor I believe.  There are 3 reference designs--modules, internal FETs, and controllers.  These solutions are in increasing level of complexity.  If you are not familiar with power supply design, I would highly recommend using the modules.  You will likely run into issues with the design or layout with discrete solutions if you are not familiar with power supply design techniques.

If none of these will work for you, then you need to contact your local FAE or power design services engineer for a custom design.