TPS74401: Maximum allowable current estimation

JH Shin

Guru 10110 points

Part Number: TPS74401

Hello,

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.

0 Juliette over 1 year ago

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.

PD = (VIN-VOUT)(IOUT)

TJ = TA + PD(Theta-JA)

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

Ensure that TJ does not exceed abs max.

Best,

Juliette

Power management forum