• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 242 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS76333 and reverse current

Michal Gadaj
Prodigy 20 points


Hello,

I have the question about the regulator TPS76333. I found in the pdf such information:

"The TPS763xx pass element has a built-in back diode that safely conducts reverse currents when the input

voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the

input and is not internally limited. If extended reverse voltage is anticipated, external limiting might be

appropriate."

 

I have the question, what is the maximum reverse current that can flow through back diode ??

 

Regards

   Michal

  • 0
    TI__Expert 8890 points

    Hi Michal,

    Unfortunately the reverse current rating is not characterized - and so you won't find it in the Electrical Characteristics table as you already know.  The fact is that it is not the current that kills the part so much as "heat" due to power dissipated.  You could have a large output capacitor charged to 5V with the input connected to ground at turnoff.  A large amount of current could flow for a short time (with 5V across the part) but this may or may not heat the part to the point of damage as the output capacitor is discharged.  One can assume that this LDO can easily withstand, at minimum, the level of current  specified by the maximum current limit (1.5Amps or slightly greater) for a few milliseconds at turnoff for the case where the output capacitor is same as that suggested in the data sheet.