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TPS62913: power xilinx FPGA Artix-7 XC7A100T

Part Number: TPS62913
Other Parts Discussed in Thread: TPS62903

1.

TI solution Page:  Power for Xilinx FPGAs

Power for FPGA attach, processors, ASICS | Xilinx | TI.com

select  XC7A100T with 1.0V 2.3A,  one of the recommended DC/DC Converters is  TPS62913.

In the datasheet of TPS62913,  Page 22, " the total capacitance for both L-C filters must be less than 200 μF"

BUT, XC7A100T FGG484 package VCCINT (1.0V ) needs  "1 of 330 μF, 6 of 4.7 μF, 8 of 0.47 μF" , VCCBRAM(1.0V) needs "1 of 100 μF, 2 of 0.47 μF". (Xilinx UG483 Page 16)

The  total capacitance is much larger the 200μF!

Can TPS62913 power VCCINT? Is there any solution for large capacitance with tps62913?

2.

If TPS62913 can not power VCCINT,  can I use TPS62903 ?

In the datasheet of TPS62903, there is not max  capacitance requirement.

Thanks!

  • In the datasheet of TPS62903 Page 4, " Co  Effective output capacitance (2.5MHz selection)  100 μF" with  "Note (1) This is for capacitors directly at the output of the device. More capacitance is allowed if there is a series resistance associated to the capacitor"

    so, TPS62903 can not power the VCCINT?

  • Hi

        我个人觉得最为准确的还是以测试为准。datasheet推荐或者要求通常都是要遵循的,但是如果TI出现的参考设计出现与datasheet有出入的地方,是可以参照参考设计的,因为这些设计肯定也是通过测试确认过的。