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LM2594M-ADJ protection diode between OUTPUT and +Vin necessary?

Mark Sample
Prodigy 100 points
Other Parts Discussed in Thread: LM2594, LM2594HV

I am using the Texas Instruments LM2594M-ADJ in a new product design.  Do you know what the maximum reverse voltage is from the OUTPUT pin to the +Vin pin?  I basically just need to know if a protection diode should be placed between OUTPUT and +Vin to prevent the reverse voltage from getting too high when the input voltage goes to 0  on power-down and there is still 5V being held up by the output cap.  The circuit is set up for 5V output.

I've seen this done with other linear regulators in the past but not sure if it is really needed.

Thanks,

Mark

  • 0
    TI__Mastermind 22610 points

    LM2594/LM2594HV SIMPLE SWITCHER® Power Converter 150 kHz 0.5A Step-Down

    Mark,

    Your question is posted in the Linear Regulators Forum, not the proper place for Simple Switcher (i.e. LM2594M-ADJ) questions.

    This thread will be moved to the Simple Switcher Forum.

     

  • 0 in reply to Donald Jones
    TI__Genius 11085 points
    Mark,
    The Vout to Vin abs max is not spec'd on the datasheet. But I think it is a good idea to add a diode to prevent too much reverse voltage. Reverse voltage could generate harge current spike through the body diode of the internal FET and over-stress of the FET.
    regards,Yang