Powering VCCINT_VCU Rail in the Xilinx® Zynq®UltraScale+™ Family of Multiprocessors

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.

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1 Introduction

In the Integrated Power Supply Reference Design for Xilinx® Zynq® UltraScale+™ ZU5EV and Artix® 7 FPGAs, the system input power source is DC 5-V, provided by a YU0506, 30-W 5-V 6-A AC/DC Power Adapter. For the VCCINT_VCU rail, this input voltage needs to be regulated down to 0.9-V (±3%) and sustain a current ranging from 500-mA up to 3-A depending on the complexity of the video processing tasks in the end application.

Table 1. Key Specification Relevant for the VCCINT_VCU Rail

Parameter	Specifications	Details
Input power source	DC 5-v, 6-1 (30-W)	YU506
VCCINT_VCU	0.9-V, ±3%, up to 3-A	Independent rail for -EV product variants

2 Proposed Solution

To provide flexibility and scalability in designing the VCCINT_VCU power rail for a wide variety of performance requirements, this technical note discusses solutions based on pin-to-pin compatible families of products able to deliver output currents ranging from 1/2-A up to 4-A, which can be selected and easily substituted according to the needs of the system, even at a late point in the design process.

The following sections concentrate on describing two highly efficient, solution-size optimized DC/DC converter families with focus on improving light load efficiency and transient response speed as shown in Section 2.1, or controlling and/or filtering out switching noise as shown in Section 2.2.