• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 304 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.

TPS53319: LDO operation when Vin is 5V

Viktorija Cecil
Mastermind 18491 points
Part Number: TPS53319

My customer is using TPS53319 on a number of our boards, and is starting to see issues. 

Vin is 5V with a 1V output..

TPS53319 has an LDO internal but I can’t see the LDO working reliably with 5V input when it wants to output 5V? The datasheet talks about 4.5V input minimum. In that case I really struggle to see how an LDO would work.

I need to confirm if a 5V input to this part is a problem.

Any guidance would be appreciated. 

Thanks

Viktorija

  • 0
    TI__Genius 14455 points

    Hi Viktorija,

         When the VDD is greater than 5V+Drop-out-voltage, the LDO will be able to regulate its output to 5V nominal. Using a drop of 250mV as per datasheet, if VDD is greater than 5.25V, then LDO output will be 5V. When the VDD voltage gets lower than that, then the LDO will operate in drop-out mode and its output will be VDD-Dropout voltage. So when VDD is 5V, then LDO output will be 4.75V. The internal circuitry will still operate with the LDO output, however the LDO output will be lower than 5V.

    You can look into the Eelectrical Characteristics table in the datasheet.

    Regards,

    Gerold