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How to handle Xilinx virtex5 Vccint?

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u24c02

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Hi.
I'd like to supply the voltage to Xilinx Virtex5 Vccint.

And I found the some texts as belows.

Virtex-5 FPGA DC Characteristics
0
Virtex-5 FPGA Data Sheet:
DC and Switching Characteristics
DS202 (v5.4) December 4, 2014 0 0 Product Specification
Table 1: Absolute Maximum Ratings
Symbol Description Units
VCCINT Internal supply voltage relative to GND –0.5 to 1.1 V

I think it should be supplied 1.0V. But the problem is that main board's input voltage level is 5V 2A. So I think that I need to voltage drop.

Does anyone know what should I do for handling for this problem?

Generally, How to handle Virtex5's Vccint?
 

The 1.0V supply is (on larger FPGAs) able to draw up
to 10A or so. You want a well implemented DC-DC (I'd
recommend one of the single chip buck converters out
there, like from TI or Intersil, LTC or maybe Maxim. You
sure do not want a linear regulator. And you had better
consider going bigger on the 5V feed because 1V@10A
at 100% efficient would account for all of your 5V, 2A.

I'm relatively confident that Xilinx has their own set of
recommendations for you, in app notes if not a fully
blessed go-buy-it partner solution.
 

u24c02 said:
Virtex-5 FPGA Data Sheet:
DC and Switching Characteristics
DS202 (v5.4) December 4, 2014 0 0 Product Specification
Table 1: Absolute Maximum Ratings
Symbol Description Units
VCCINT Internal supply voltage relative to GND –0.5 to 1.1 V
Click to expand...

Why are you looking at the Maximum Ratings? You should be using the "Table 2: Recommended Operating Conditions" data for your design.
VCCINT
Internal supply voltage relative to GND, TJ = 0°C to +85°C Commercial 0.95 1.05 V
Internal supply voltage relative to GND, TJ = –40°C to +100°C Industrial 0.95 1.05 V

I predict the release of magic smoke from a Virtex-5 in the future. ;-)
 

As dick_freebird cited, the single answer is: use a +5.0V to +1.0V DC/DC converter circuit integrated to your board. You must dimension the DC/DC converter output current as well (you may require more than 2A from 5V line only for this line!)

You must be sure this voltage is very stable and noiseless. A DC/DC converter kit from a common vendor (TI, Maxim) may be a good choice in your case, given the Virtex components use to be very expansive.
 
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    u24c02

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What you mean the magic smoke?
 

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