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.

TPS74401: Maximum allowable current estimation

Part Number: TPS74401


My customer wants to use TPS74401 with the conditions below.

 - VIN = 5V / VOUT = 1.5V / Room temperature

What is the maximum current available? How can they calculate it?

Thank you.


  • Hey JH, 

    It is very dependent on the layout of the PCB. 

    You can calculate it by solving backwards from the PD and TJ equations.


    TJ = TA + PD(Theta-JA)

    (TJ - TA)/((VIN-VOUT)(Theta-JA)) = IOUT

    Ensure that TJ does not exceed abs max.