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DAC5688: theta jc top resistance

Jonathan Navor
Genius 9105 points
Part Number: DAC5688
Other Parts Discussed in Thread: DAC3484

Hi Team,

Good day! Kindly help to provide the complete thermal information for this part DAC5688IRGCR. Can it be top cooled and if yes what is the value of theta JC top resistance?

The customer's main concern is the theta jc top which is used for top cooling the part.

In addition to that, I have checked this e2e E2E thread and it does mention that DAC5688 has a similar package as the DAC3484. can we consider the thermal information provided from the DAC3484.

Thank you so much. 

Best regards,

Jonathan

  • 0
    TI__Guru 67904 points

    Hi Jonathan,

    We will need to look for packaging team to help/confirm this. We will update you

  • 0 in reply to Kang Hsia
    TI__Guru 67904 points

    Hi Jonathan,

    I had dug up a message from former packaging engineer working on this project before. Please see the following while we check with the packaging team on the thermal:

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~ (from Gerry Balanon)~~~~~~~~~~~~~~~~~~~~~~~~~~~~

     We have seen customer placing external heat sink on top of the QFN packages using a thermal interface material. Key considerations doing this are as follows.

    • Thermal conductivity of the thermal interface material
    • Heat sink mounting to the PCB board – make sure that this is not putting a lot of pressure on the TI part since this can impact the package performance/integrity

     

      If the customer can increase the Cu thickness / % coverage on the PCB board that would be best. Another is if they can move the TI part towards the center of the PCB that can help dissipate heat as compared if this is located on the corner of the board.  

  • 0 in reply to Kang Hsia
    TI__Genius 9105 points

    Hi Kang,

    Thank you for sharing this information on the thermal conductivity of the thermal interface material. We will be waiting for your update from the packaging team on the thermal.

    Best regards,

    Jonathan

  • 0 in reply to Jonathan Navor
    TI__Guru 67904 points

    Hi Jonathan,

    the packaging team (Travis Blake) is working on the parameter and will update you sometime next week. Thank you.

    -Kang

  • 0 in reply to Kang Hsia
    TI__Guru 67904 points

    Hi Jonathan,

    I noticed Travis is out of office until the 27th. I will need to ping him again after he returns to office. Thank you.

    -Kang

  • 0 in reply to Kang Hsia
    TI__Genius 9105 points

    Hi Kang, 

    Thank you. We will be waiting for your update. 

    Best regards,

    Jonathan

  • +1 in reply to Jonathan Navor
    TI__Guru 67904 points

    Hi,

    Here are the updates:

    Result- Theta JA-High K (standard datasheet value):

    20.7

    Result-Theta JC, top (standard datasheet value):

    7.7

    Result-Theta JB (standard datasheet value):

    5.8

    Result- Psi JT (standard datasheet value):

    0.1

    Result- Psi JB (standard datasheet value):

    5.7

    Result-Theta JC, bottom (standard datasheet value):

    0.9