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Application Guide: Intersil
Solutions for Precise Power Delivery to Xilinx FPGAs
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Intersil's Family of Integrated FET Regulators:
EL7566:
Monolithic 6A DC/DC Step-Down Regulator |
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ISL65426: 6A Dual Synchronous Buck
Regulator with Integrated MOSFETs |
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ISL6521: PWM Buck DC/DC and Triple
Linear Power Controller |
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ISL644x: Step-Down PWM Controllers |
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ISL6420A: PWM Controller with Wide VIN,
Start-Up into Pre-Bias Load |
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ISL8102: Two-Phase Buck PWM Controller
with High Current Integrated MOSFET Drivers |
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Intersil Power Management Solutions for
Xilinx FPGAs |
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Typical Field Programmable Gate Array (FPGA)
Power Requirements |
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The flexibility of FPGAs
leads to the requirement for multiple supply voltages and
currents.
Core Voltage/Power
In large FPGAs and CPLDs, the logic core generally has the
most demanding current requirements, up to tens of amps
depending on the number of gates being used and the clock
frequency. See the table below for designated core voltage required
by the different Xilinx platforms.
| Xilinx Devices |
Virtex® Series
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Spartan® Series
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CoolRunner™ Series
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XC9500 Series
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| VCCINT |
1/1.2/1.5/1.8V |
1.2V |
1.8/3.3V |
2.5/3.3/5V |
| VCCO/VCCIO |
1.2, 1.5, 1.8, 2.5, 3.3V |
1.2, 1.5, 1.8, 2.5, 3.3V |
1.5, 1.8, 2.5, 3.3, 5V |
1.8, 2.5, 3.3, 5V |
| VCCAUX |
2.5/3.3V |
2.5/3.3V |
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I/O Voltage/Power
Designated VCCIO/VCCO and equal to 1.2V, 1.5V, 1.8V, 2.5V,
3.3V or 5V, depending on the I/O standard selected. I/O standards
can be set independently by block in the FPGA and
CPLD, so more than one I/O voltage for a single FPGA/CPLD
is possible.
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VAUX
Voltage/Power
The “auxiliary” supply is important for the latest generation of Xilinx FPGAs because
it is tied into the JTAG, DCM, and other circuitry. It is designated VCCAUX, and is
usually 3.3V or 2.5V. VCCAUX must be sufficiently decoupled in order to avoid power
supply transients coupling into the FPGA’s clock circuitry.
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Xilinx, the Xilinx logo, Virtex, and Spartan are registered trademarks of Xilinx in the United States and other countries. CoolRunner is the registered
trademark of Xilinx in the United States. |