LP2998-Q1 Thermal Dissipation

Takao Yamamoto

Genius 4135 points

Other Parts Discussed in Thread: LP2998-Q1

Dear all,

I would like to know how to calculate theta-ja.

Is there formula to calculate theta-ja according to different situation?

Best regards,

0 Tim Reyes over 9 years ago

Hi,

The Rtheta-ja value for LP2998-Q1 is shown in the datasheet: http://www.ti.com/lit/ds/symlink/lp2998-q1.pdf

The test conditions used to get this number are desicribed in this document: http://www.ti.com/lit/an/spra953b/spra953b.pdf

Regards,

Tim

0 Donald Jones over 9 years ago

I don't see any mention of the package type, SOIC or SOPowerPad.

If this is SOPowerPad you can check the TI Thermal Web Page for suggestions.

TI Thermal Web Page www.ti.com/thermal

Possible resources are:

Using Thermal Calculation Tools for Analog Components

Semiconductor and IC Package Thermal Metrics (Rev. B)

AN-2020 Thermal Design By Insight, Not Hindsight

Thermal Characteristics of Linear and Logic Packages Using JEDEC PCB Designs
http://www.ti.com/lit/an/szza017a/szza017a.pdf

0 Takao Yamamoto over 9 years ago in reply to Donald Jones

Genius 4135 points

Dear Tim & Donald,

Thank you for your reply.

But TI Thermal Web Page don't support LP2998-Q1.

And I cannot find the way to calculate value of theta-ja.

I would like to reflect theta-ja in the design of layout of 8 layer PCB board.

Is there the way to understand IC's development of fever?

Best regards,

Power management forum