CSD18512Q5B: different continuous drain current

Hale Tan

Part Number: CSD18512Q5B

Hi team,

What is the difference between the continuous drain current(package limited) and continuous drain current as below? Why the second one is smaller? What is the limit condition?

over 1 year ago

0 John Wallace1 over 1 year ago

TI__Mastermind 33245 points

Hello Hale,

Thanks for the inquiry. Please see the blog at the first link below for more information on MOSFET continuous current ratings. The package limit is related to the internal connections between the silicon die and the plastic package is independent of temperature. The silicon limit and smaller value of continuous current are both calculated numbers. The silicon limit assume TC = 25°C and uses RθJC in the calculation whereas the lower limit assumes TA = 25°C and uses RθJA in the calculation. I'm including a second link to an app note that includes links to all of TI's web based FET technical information including the datasheet series of blogs.

https://e2e.ti.com/blogs_/b/powerhouse/posts/understanding-mosfet-data-sheets-part-3

https://www.ti.com/lit/an/slvafg3b/slvafg3b.pdf

Let me know if you have any questions.

Best Regards,

John Wallace

TI FET Applications

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

Power management

Power management forum

CSD18512Q5B: different continuous drain current