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Original question:

LP2989: For the LP2989IMM-5.0/NOPB, what is the actual minimum input voltage for 200 ma output?

LP2989: Dropout Characteristics for 5V

Stefan Lintner
Expert 5185 points
Part Number: LP2989

Hi team,

my customer would like to know the dropout characteristics of the LP2989-5V variant.
Ideally, he would like to see the plot below for the 5V version.

If this is not possible, can someone comment on whether supplying the LP2989-5V with 5V will produce something about 4.75V under 50mA or not?

BR,
Stefan

  • 0
    TI__Mastermind 23361 points

    Hi Stefan, 

    LP2989-5V is the fixed 5 V option, and with Vin =5V and Iload <50mA, the LDO is in dropout, so the Vout = Vin - Vdropout@Iload. 

    At IOUT = 200 mA, the maximum dropout is 200mV, so yes, with 5V and less than <50mA, the output voltage will be higher than 4.75V. But if you use the LDO in dropout, the LDO is not able to provide the filtering on the input noise. 

    If your designed output is 4.75V, I would suggest you go with the adjustable option, and yes, you could provide 5V to drive the output to 4.75 and the LDO is then in regulation. 

    Regards, 
    Jason Song