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LMR36503-Q1: Efficiency of 3.3V part / DC offset in PFM mode

Oliver Peppe
Prodigy 20 points
Part Number: LMR36503-Q1

Tool/software:

Hi there,

I am interested in the efficency of the 3.3V output version of this part in light load conditions (auto / PFM mode). Is there an equivalent to figure 7.3 (efficiency of 5V output part in Auto mode) but for 3.3V output part?

Also, section 8.4.3.2.2 of the datasheet mentions the dc-offset on output when lightly loaded in auto mode. It says "output voltage must be approximately 1% high when the part is completely unloaded" - can you provide any more information on the likely maximum value of this offset, and what affects it.

Thank you.

Oliver.

  • 0
    TI__Mastermind 22280 points

    Hi Oliver,

    You will see some efficiency curves in section 9.2.3 of the datasheet. 

    For auto mode, it is hard to say, since what determines the output voltage is the number of switching pulses the device will issue when COMP necessitates (as the output voltage is slowly dropping to the regulation target at a very light load). As specified in the DS, it is around ~1%. 

    Thanks,

    Richard