FPGA power boost from PMIC reference designs

March 25, 2020 //By Nick Flaherty
PMIC reference designs for Xilinx FPGAs and SoCs
PMIC reference designs with the Renesas ISL91211AIK and ISL91211BIK in BGA packages speed development of industrial and computing systems.

Renesas Electronics has launched three PMIC Power Management IC reference designs for powering the multiple supply rails of Xilinx Artix-7 FPGAs, Spartan-7 FPGAs, and Zynq-7000 SoCs, with and without DDR memory.

Renesas has worked closely with Xilinx to on the designs that speed the development of power supplies for a variety of industrial and computing applications, including motor control, machine vision cameras, programmable logic controllers (PLCs), home gateways and appliances, and portable medical and wireless equipment.

The designs are based on the four-phase, three output ISL91211AIK PMIC, and the four-output ISL91211BIK PMIC. Both PMICs can deliver up to 20A total output current and feature independent dynamic voltage scaling. The control loops are tuned to specifically support the load profiles of Xilinx FPGAs, managing power up and shutdown sequencing of their rails internally, without requiring external sequencing controllers.

A single design to support different Xilinx speed grades and DDR memory types: DDR3, DDR3L, DDR4, LPDDR2 and LPDDR3. Applying 2MHz switching frequency and fast load transient response enables each PMIC board to use smaller 22uF output capacitors and a small inductor to reduce solution size.

The PMICs come in 4.7mm x 6.3mm, 35-ball BGA with 0.8mm pitch packages.

“Our PMIC reference designs significantly accelerate customer development schedules by providing tested and complete solutions ready to connect to and power Xilinx’s Artix-7, Spartan-7 and Zynq-7000 devices,” said Andrew Cowell, Vice President, Mobility, Infrastructure and IoT Power Business Division at Renesas. “Both multiphase PMICs employ Renesas’ industry-leading R5 modulation technology for blazingly fast transient response, while allowing designers to dynamically scale power to improve overall system performance.”

The ISL91211A-BIK-REFZ reference design board for Artix-7 devices employs the ISL91211AIK and ISL91211BIK multiphase PMICs, ISL80030 3A synchronous buck DC/DC converter, and ISL21010DFH312 micropower voltage reference. The PMICs deliver efficiency up to 95 percent for multiple power rails and they accept 5V input from a plug-in AC/DC adaptor or DC power supply. The ISL80030 supports VCCO and VCC_IO for 3.3V, 2.5V and 1.8V, and the ISL21010DFH312 is for XADC input voltage of


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