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TPS767D3: TPS767D301's power rating and thermal imformation

Seongdae Kim
Prodigy 160 points
Part Number: TPS767D3

1. Could you help me to know about the power rating mentioned at table below in the TPS767D301’s datasheets.

   Are these values the sum of power consumptions of two LDO inside of TPS767D301?

   Otherwise, are these values the power consumption of each LDO inside of TPS767D301?

 


 

 2. Could you help me to know about the thermal information below about TPS767D301.


 


  • 0
    TI__Expert 5565 points

    Hello Seongdae,

    1. This table describes the max power dissipation allowed across the LDO for a given condition. For example, for a board with no airflow, an ambient temperature of 70C and the parameters described in the footnote, the part can only dissipate up to 1.97W before the internal junction temperature reaches 125C.

    2. A RθJA value can be derived from the Dissipation Rating Table. (125C - 70C)/1.97W = 27.92C/W. For the other parameters, I will need to run a simulation. This can take up to two weeks. Is this okay?

    ~ Aaron 

  • 0 in reply to Aaron Paxton
    Prodigy 160 points

    Hello Aaron

     

    Thank you for your reply.

     

    Do you tell me that the power rating mentioned in the datasheets are the sum of power consumptions of two LDO inside of TPS767D301?

    I want that you consider the my case below and reply to me.

     

    For example, TPS767D301’s inner first LDO consumes 1.054W and second LDO consumes 1.042W.

    The first LDO: Ta_max = 125℃ - (27.92℃/W x 1.054W) = 95.6℃

    The second LDO: Ta_max = 125℃ - (27.92℃/W x 1.042W) = 95.9℃

    So that, I think that I can use TPS767D301 up to 90℃ for these each power consumptions.

    Am I wrong?

    By your answer, is right that the Ta_max is 66.48℃( = 125℃ - 27.92℃/W x 2.096W)?

     

     

    If you do so, I would like to receive the other thermal parameters after 2 weeks. Thank you.

     

    Best regards

    Seongade

  • 0 in reply to Seongdae Kim
    TI__Expert 5565 points

    Hello Seongdae,

    Yes, the dissipation is for the entire package; so it includes both LDOs.

    For your example, the second approach is correct: 66.48C would be the max ambient temperature in this case.

    I will submit a request and get back to you in two weeks.

    ~ Aaron

  • 0 in reply to Aaron Paxton
    TI__Mastermind 23361 points

    Hi Seongdae,

    Please see the complete thermal parameters for this device.

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

    27.7

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

    18.2

    Result-Theta JB (standard datasheet value):

    8.8

    Result- Psi JT (standard datasheet value):

    1.3

    Result- Psi JB (standard datasheet value):

    8.7

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

    1.8

    Regards, 

    Jason