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TPS65023: Power solution Spartan 7

Fredda
Intellectual 595 points
Part Number: TPS65023
Other Parts Discussed in Thread: LM3880, TPS65218D0, BOOSTXL-TPS65218

Hi,

I'm looking for the simplest possible solution to power a Xilinx Spartan 7 FPGA. The best solution would be a PMIC with 1.0 V, 1.8 V and 3.3 V outputs which are sequenced in that order. I don't need any DDR voltages. I've looked at the TI power solutions for Xilinx FPGAs and haven't found a suitable candidate yet. The TPS65023 is used in many examples, but this PMIC cannot generate 1.0 V and must be sequenced from an external source. In addition, I don't need DVS and the possibility to configure the PMIC via I2C.

Am I looking for something that is non existent? Am I forced to use a sequencer such as the LM3880 and discrete converters? Or perhaps just connecting the PGOOD from one converter to the ENABLE input on the next converter. This would not, however, support a power-off sequence. On the other hand, Xilinx is not very specific when it comes to the power-off sequence and why it would be important to power off the voltages in the reverse order compared to the power-on sequence.

/F

  • 0
    TI__Mastermind 30280 points

    Fredda,

    The TPS65023 can generate 1.0V, which you can see if you refer to the full definition of the DEFDCDCx pins on page 42 of the datasheet. An external resistor divider can be used as shown in Figure 41 to set output voltages (down to 0.6V) other than the boolean options shown in Table 20. 

    However, if you still do not want to perform manual sequencing of the TPS65023, then you can refer to the below diagrams that show how the TPS65218D0 can be used to power the Spartan-7 FPGA.

    TPS65218D0 powering Spartan-7 (with DDR)

    TPS65218D0 powering Spartan-7 (without DDR)


    Note that DCDC2 of the TPS65218D0 cannot provide 1.8V or 3.3V for the higher voltage rails because it is only configurable from 0.85 V to 1.675 V

    If you are interested in using the TPS65218D0 to power the Spartan-7 FPGA, you can use the BOOSTXL-TPS65218 to re-program samples of the PMIC for prototype development.

  • 0 in reply to Brian Berner
    Intellectual 595 points

    > The TPS65023 can generate 1.0V...

    Ok, fine! I guess I was browsing through the datasheet too fast...

    I will have a closer look at TPS65218D0.

    Thanks.

    /F