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TPS6287B25: 0.8V output availability

Nicole Wreyford
Prodigy 71 points
Part Number: TPS6287B25

Tool/software:

Good day,

I would like to use the TPS6287B25 for an FPGA core supply. Depending on the speed grade of the FPGA, I may need either 0.75V or 0.8V for the core supply. Our initial product will need the 0.8V supply, but we will later convert it to the 0.75V supply. I can use the TPS6287B25LA0WRZVR for the 0.75V, but not for the 0.8V. I would want to use the TPS6287B25HA0WRZVR for the 0.8V, but it is not in stock. When will this device be available?

Do you have any other suggested devices that can be used? The footprint must be small and the device must be rated at -40 to +85 degrees Celcius. 

Kind regards,

Nicole

  • 0
    TI__Guru*** 147320 points

    Hi Nicole,

    How much output current do you need?

    Both the H and L versions are released.  Where did you not see stock?  Did you check the TI store?

    Both devices can be adjusted across the full voltage range, which includes both values.  The difference is the start-up voltage is limited to 0.775V maximum for the L and 0.8V minimum for the H.  Would it possible to adjust the voltage with I2C?  

    Would you adjust the voltage during operation?  If not, the V version covers both voltages.

    Thanks,

    Chris

  • 0 in reply to Chris Glaser
    Prodigy 71 points

    Hi Chris,

    Thank you for your reply.

    We need a maximum of 25A. 

    On TI's website (see image below). I was also unable to find it on Digikey or Mouser.

    We will have an I2C connection to the device. Does that mean that I can set the start voltage with VSET to 0.75V for both FPGAs and then only need to update the voltage via I2C for the 0.8V requirement?

    The voltage will stay consistent during operation. 

    Where in the datasheet is it specified that the L device is capable of supplying voltages above 0.775V? Why would separate device be made for the start up voltage difference alone?

    Kind regards,

    Nicole

  • +1 in reply to Nicole Wreyford
    TI__Guru*** 147320 points

    Thank you for explaining, Nicole.  Let me check on why the samples are not showing.

    Yes, each device supports the full Vout range:

    There are different device versions for the different startup voltages, since the device can only read 16 values.  To get small enough voltage step sizes, we had to split the ranges.  See table 8-5 and following.

    Are you able to program the device with I2C before it starts?  If so, then any device can be set to 0.75V for startup.

    Chris

  • 0 in reply to Chris Glaser
    Prodigy 71 points

    Hi Chris,

    Thank you for the clarification. That makes sense.

    Kind regards,

    Nicole

  • 0 in reply to Nicole Wreyford
    TI__Guru*** 147320 points

    Hi Nicole,

    Are you able to see any sample stock now?

    Our IT people looked into this, and it looks like your email address is not associated to your company's account listing somehow.  They said to contact customer support and ask them to map your email to your company. https://www.ti.com/info/customer-support.html 

    Chris