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Buck regulator with 0.3V output

Bendik Kleveland
Prodigy 50 points
Other Parts Discussed in Thread: TPS53679, TPS53647, TPS53667

I could only find a regulator with output voltage as low as 0.35V  i.e. http://www.ti.com/lit/ds/symlink/tps546c23.pdf

I would like to operate below this. Do you have any solution for that either now or in the works?  Maybe with some adjustments with external components

  • 0
    TI__Guru**** 150770 points
    What is your input voltage and required output current? Do you need PMBus, like that device?
  • 0 in reply to Chris Glaser
    Prodigy 50 points
    It is at an early stage for us, so at this point we are flexible with input voltage requirements. Output current as high as possible - ideally gang devices together so we can reach 150A+ No specific bus requirement - PMBUs/i2c or other. THanks for the quick reply.
  • 0 in reply to Bendik Kleveland
    TI__Expert 4060 points

    Hi Bendik,

    The TPS53679 can deliver 0.3V at 150A on the 6 phase output. The lowest its output can go is 0.25V. However, at such extreme duty cycles the efficiency of the regulator will not be very high and stability issues may creep up during operation, especially in corner scenarios. I'd recommend thoroughly testing your design before going to production.

    If I can be of more help please let me know.

    Thanks,

    Carmen 

  • 0 in reply to Carmen Parisi
    Prodigy 50 points
    Thank you very much, Carmen!
    This is what I was looking for. I searched on the net for this (the link above wasn't valid anymore).
    I could not find detailed datasheet. Only a few pages: www.ti.com/.../tps53679.pdf
    It did say that it was: Fully Compatible with TI NextFET™ Power Stage for High-Density Solutions
    Does this mean that you could have more of these in parallel?
    Thanks,
    Bendik
  • 0 in reply to Bendik Kleveland
    TI__Expert 4060 points

    Hey Bendik,

    To access the full TPS53679 datasheet you would have to fill out the request form and get an NDA in place with TI first.

    The Smart Power Stage comment just means it's compatible with parts like the CSD95738 that have the built in current sensing circuitry in place of using DCR Sensing or Resistor Sensing for the phase currents. There's also some built in temperature monitoring features as well.

    Only one stage per phase is allowed so 6 phases and 6 power stages at once. The TPS53679 can't be stacked for >6 phase applications.

    Thanks,

    Carmen

  • 0 in reply to Carmen Parisi
    Prodigy 50 points
    Thanks. Could you point me to the request form. Although this will be clear when I get the details, does the 6 phase stacking assume 6X of this part or is the phase setting something internal to the part.
  • 0 in reply to Bendik Kleveland
    Prodigy 50 points
    Would this be an equivalent eval module? Just 4 phases instead of 6?
    www.digikey.com/.../55991
  • 0 in reply to Bendik Kleveland
    TI__Expert 4060 points

    Morning Bendik,

    Yes, the TPS53647 would be a 4 phase, D-CAP+ regulator that's compatible with the smart power stages. There's also the TPS53667 which has 6 phases and the full datasheet available online since there is no Intel proprietary SVID bus on the part.

    I'm looking into how to have you request a full datasheet for the NDA parts and will link it to you when I hear back.

    For the multiphase operation, using the TPS53679 as an example, you can have 6 phase with one controller as there are 6 PWM outputs that can be assigned to one rail. Each of those outputs goes to a smart power stage. Stacking, which is combining two or more controllers, for >6 phases is not supported on the TPS53679, TPS53647, or TPS53667.

    Thanks,

    Carmen