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LP5907: dropout voltage

JeffYC Yang
Expert 1290 points
Part Number: LP5907

Hi Sir,

I would like to know about LP5907-3.3 dropout voltage define. In datasheet P5, it max. 250mV @ Iout = 250mA.

So, If I set I want to keep Vout can always not lower than 3.3V, I just need keep Vin = 3.3 +0.25V = 3.55V, right?

because I saw the section 6.5 as below, or it mean other spec based on this test condition?

Thanks!

Jeff

  • 0
    TI__Expert 6825 points

    Hi Jeff,

    Sorry for any confusion caused by this test condition. This is the overarching test condition for the Electrical Characteristics table. Meaning that all of the specs without other test conditions stated are tested at that condtion.

    For the dropout spec Vdo look at footnote 7, it shows that the dropout is the measured difference between the input and output when Vout is lower than Vout(nom) by 150mV.

    For your application if you keep Vin higher than Vout(nom) by 250mV the LDO should not be in dropout. However, if you operate the LDO with that little headroom the performance will be degraded specifically the PSRR.

    Best Regards,

    Mark

  • 0 in reply to Mark Sellers
    Expert 1290 points
    Hi Mark,

    Got it. thanks!!