LM117QML-SP: Theta-JC to the top of the CFP package

Doug Young

Part Number: LM117QML-SP

Hi,

I am thinking of using the LM117QML-SP linear to pass or limit an unregulated voltage bus, 28V ≤ VBUS ≤ 36V, to be ≤ 32V.

I estimate the maximum load on the output of the LM117QMP-SP to be around 9.15W.

I would like to use the CFP package and I can attach a heat sink to the top of the device. The theta-jc given in the datasheet is to the bottom or board side of the package.

What is the junction to case thermal resistance to the top of the CFP package?

Thank You!

Doug Young

over 1 year ago

0 Sarah Koch over 1 year ago

TI__Expert 7125 points

Hi Doug,

I'll submit a thermal modeling request for the CFP package option of this device and update you once it is completed. Typically this takes ~2 weeks.

Thanks,

Sarah

0 Doug Young over 1 year ago in reply to Sarah Koch

Intellectual 305 points

Hi Sara,

Thank you, I am looking forward to seeing the results!

Sincerely,

Doug Young

0 Sarah Koch over 1 year ago

TI__Expert 7125 points

Hi Doug,

Here are the remaining thermal values (°C/W) provided by the thermal model for the CFP package option of this device:

Theta JC, top	58.2
Theta JB	102.0
Psi JT	34.4
Psi JB	92.5

Thanks,

Sarah

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LM117QML-SP: Theta-JC to the top of the CFP package