Description: The Xilinx Virtex-5 FPGA is a family of advanced FPGAs that combine various platforms and speed grades enabling a high level of performance and flexibility. This application note discusses the Virtex-5 FPGA power supply prerequisites in terms of the multiple voltage rail and current level requirements, output sequencing, and startup characteristics. Exemplarily, a power supply solution based on National Semiconductor LM1771 power supply controller and LM3880 sequencer is designed that combines high performance, power density and efficiency.