In the Xilinx® Zynq®UltraScale+™ family of multiprocessor systems-on-chip (MPSoC), the highly integrated -EV devices are designed for applications requiring high definition video and feature an embedded high performance video codec unit (VCU). The VCU needs to be powered by an independent 0.9-V internal supply rail named VCCINT_VCU. This short technical note is an extension to the reference guide for Integrated Power Supply Reference Design for Xilinx® Zynq® UltraScale+™ ZU5EV and Artix® 7 FPGAs and discusses low power buck converters to power the VCCINT_VCU rail depending on the requirements of the end application.