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TPS2113A: need additional details for derating

user5018898
Intellectual 770 points
Part Number: TPS2113A

Hi, 

I am working on some derating activity for this device, but i am not able to find all the information i need from the datasheet. 

I see there is the rdsOIN curve in figure 8 of the datasheet, but do you have one for the max rds as well? I would like to understand what the worst case rdsON would be across temperature but I cannot correlate it with the data I have available. 

Also, what is the thermal resistance of the device? I see the spec for the thermal shut down but what power dissipation will result in the device reaching the TJmax resulting in thermal shutdown?

My final questions is how do I interpret the dissipation rating table on page 2?

Thanks, 

Jose

  • 0
    TI__Genius 10652 points

    Jose,

    user5018898 said:
    I see there is the rdsOIN curve in figure 8 of the datasheet, but do you have one for the max rds as well? I would like to understand what the worst case rdsON would be across temperature but I cannot correlate it with the data I have available. 

    We do not have a rdson curve, but we do publish the worst case based on process or temp in electrical characteristics (150mOhm for TPS2113A)

    user5018898 said:

    Also, what is the thermal resistance of the device? I see the spec for the thermal shut down but what power dissipation will result in the device reaching the TJmax resulting in thermal shutdown?

    My final questions is how do I interpret the dissipation rating table on page 2?

    The table for SON-8 is actually kind of wrong. the power ratings should all be W not mW.

    For thermal resistance, the derating factor is actually the inverse of Rjtheta. So for TSSOP-8, which doesn't have a thermal pad, it is ~256C/W, and for SON-8 it is 40 C/W.

    All of these power ratings are set at a max of Tj=125C.

    lets call D as derating factor, P_dis as the power dissapted in the device.

    Tj=1/D*P_dis+T_A

    You'll notice if you set Tj to 125C (tjmax) you get the same power ratings.

    If this answers your questions, please let me know by pressing the green button.

    Best

    Dimitri