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TPS62800: What is the max output voltage when in PFM mode

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Replies: 6

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Part Number: TPS62800

Hi Support team, 

What is the max output voltage on the TPS62800 when the part is in PFM mode? They have the output set to 1.2 volts and are working out all of the margins and tolerances. 

Thanks

Jeff Coletti

  • Hi Jeff,

    can you confirm that TPS62800 is the correct part? This device has either a fixed Vout of 0.7-V (VSEL/MODE = GND) or Vout in the range of 0.4-V to 0.775-V in 25-mV steps according to Rvsel settings.

    PFM mode should not impact the max output voltage.

    Does this answer you question?

    Best regards,

    Britta

  • In reply to Britta Ruelander:

    Sorry, tps62801 actually

  • In reply to Jeff Coletti:

    Thanks, Jeff.

    My comment with regards to PFM still applies, of course.

    Is the concern on the Vout nominal, or ripple? Or are there other parameters that the customer is specifically looking for?

    Best regards,

    Britta

  • In reply to Britta Ruelander:

    Hi Britta

    I thought that when in PFM mode the output voltage increases a little?  They are looking for both peak and nominal max mins. 

    Cheers J

  • In reply to Jeff Coletti:

    Hi Jeff,

    I might have misunderstood.

    When transitioning from PWM to PFM there is a voltage overshoot (like shown in Figure 10, Section 8.4.4 of the datasheet), you're correct. This overshoot is kept low by the optimized transient performance of the device. Figure 35 and 36 shows typical operation in PFM mode with the according variation of Vout.

    Is VSEL/MODE pin connected to GND for the fixed 1.2-V output voltage selection or did the customer connect a resistor to ground? I currently assume the pin is continuously connected to GND.

    Best regards,

    Britta

  • In reply to Britta Ruelander:

    Hi Jeff,

    as I didn't hear back from you I assume your issue has been solved.

    Please note that I am going to close this thread now.

    Best regards,

    Britta

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