TPS25942L: TPS25942L heat generation calculation

Conor

Part Number: TPS25942L

Hi,

I'm considering using the WQFN package for TPS25942L. The current consumed by the TPS25942L is large and I am concerned about heat generation. I would like to check how to calculate the theoretical maximum heat value of TPS25942L. Am I correct in my understanding that if the P[W] of the IC exceeds 2.7W from Tj= (θja x P) + Ta = ( 38.1[℃/W] x P[W] ) + 25℃, it is difficult to use the TPS25942L from the standpoint of heat generation?

Thanks,

Conor

over 1 year ago

0 Arush Gupta over 1 year ago

TI__Mastermind 34885 points

Conor,

We will get back to you by EOD.

Best Regards,
Arush

0 Arush Gupta over 1 year ago in reply to Arush Gupta

TI__Mastermind 34885 points

Hi Conor,

This might help you regarding the thermal metrics: Semiconductor and IC Package Thermal Metrics (Rev. C) (ti.com)

For checking the feasibility of device for your application, you can use P[W] vs Time to TSD graph. Section 10.2.2.5 shows example for start-up case.

Here you can see that device can handle 2.7W Power Dissipation for very long time.

Best Regards,
Arush

0 Conor over 1 year ago in reply to Arush Gupta

Guru 11670 points

Hi Arush,

Thank you !!

Can you confirm the contents of the detailed calculations I have made? I would like to discuss this with you via private message as it contains internal information. I have sent you a friend request, can you approve it?

Thanks,

Conor

0 Arush Gupta over 1 year ago in reply to Conor

TI__Mastermind 34885 points

Conor,

Sure, I have accepted the request.

Best Regards,
Arush

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TPS25942L: TPS25942L heat generation calculation