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LP38798: Minimum Iout Required?

Duncan MacGregor
Intellectual 470 points
Part Number: LP38798
Other Parts Discussed in Thread: LP5907

Is there any minimum current output requirement for this device? I don't see this specifically addressed in the data sheet. Appreciate your help.

  • 0
    TI__Mastermind 23361 points

    Hi Duncan, 

    I have reviewed the datasheet. The datasheet does not specify a minimum load current for the part to work, but the product specification table and characteristics curves were all taken at higher than 10mA. If your load current is higher than 10mA, you should be good; if not, to achieve the datasheet performance, you will need to burn additional power to have at least 10mA of load current. 

    Regards, 

    Jason Song

  • 0 in reply to Jason Song
    Intellectual 470 points

    Jason,

    Thanks for the quick response. In normal use we will always be above the 10 mA (more like 100 mA or above) threshold so that should be OK. There are some circumstances where the external load would not be connected so we just want to make sure that's not an issue. Without the load connected we're really not too concerned about the output performance but want to make sure it's not an issue for the LP38978. Sounds like this should be OK.

    Thanks - Duncan

    PS - I like this answer better than the other one for the LP5907 input voltage headroom :)!

  • 0 in reply to Duncan MacGregor
    TI__Mastermind 23361 points

    Lol, thank you. It should be fine as your stable load condition is higher than 10mA. Thanks for your feedback on the LP5907 one; if you have any concerns or additional questions, please do not hesitate to let me know.