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TPS25981: TPS25981 thermal prediction

Randy Chen
Intellectual 1970 points
Part Number: TPS25981
Other Parts Discussed in Thread: TPS25982,

Hi, 

Customer is wondering why that small package chip (TPS25981) ΨJT is lower than the bigger package chip (TPS25982)? 2.1 C/W vs. 3 C/W : 2x2mm vs. 4x4mm.

How to predict that thermal result if 9A(Vin 12V) current pass thru, 8layer PCB, 50'C.

TPS25981 thermal information:

TPS25982 thermal information:

Best regards,

Randy 

  • 0
    TI__Guru 68935 points

    Hi Randy,

    To predict rise in junction temp RQJA is important. TJ= TA+ (PD*RQJA). RQJA for 8 layer pcb with vias and good amount of copper should be close to the datasheet value for custom pcb.

    PD-> power dissipation across eFuse

    Regards

    Kunal Goel