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TPS798-Q1: EN pin differential

John Wehle
Prodigy 90 points
Part Number: TPS798-Q1

The TPS798 datasheet says:

Maximum ratings:

EN -65v to 60v
EN to IN differential 0.6v to VIN

I'm not sure I understand the differential rating of 0.6v.

If I tie EN (which enables the regulator) to IN I have a differential of zero.

Can you clarify the restrictions on the EN to IN differential? Is it along
the lines of:

EN to IN differential -IN to 0.6v

meaning that EN can be at ground (aka IN more negative than IN) and
up to a maximum of 0.6v more positive than IN.

Specifically I'm looking to confirm whether EN is allowed to be more
positive than IN or if a voltage translator is required.

  • 0
    TI__Intellectual 825 points

    Hi John,

     Thank you for bringing to our attention this EN-IN differential spec.; it is indeed unclear. After talking to our designers, it is safe to say that the EN pin can be set up to 0.6V higher than the IN pin. 

    I've asked our designers to look at the design schematic to help clarify the spec. Maybe the EN pin can indeed go higher than just 0.6V above Vin. OR Maybe it should have been written the way you mentioned above "EN to IN differential -IN to 0.6v".   I'll update the forum in a week or two for the findings.

    Regards,

    Chito

  • 0 in reply to Chito Tapia
    TI__Intellectual 825 points

    Hi John,

     Sorry for the delay, we had to dig from the archive. Our designer has verified that EN pin can only go up to 0.6V higher that IN pin. You are correct in assuming that this spec should have been written as "EN to IN differential -IN to 0.6v".  

    Regards,

    Chito