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TPS54821 thermal information

Mac Chen
Intellectual 590 points

Hi Sir, 

Is the thermal information correct on the datasheet ?

I saw the RthetaJctop is higher, and the thetaJB is lower than Jctop 50 degree. 

RthetaJctop is 64.8, and it means this thermal issue should be concerned with this package. 

Could you give some comments?

thanks 

  • 0
    TI__Guru**** 191445 points

    For a thermal pad package it is assumed that almost all of the heat is transferred to the PCB by the thermal pad. So the Theta JC top number may be quite large. It is included for completeness but has little practical usage.  see this document for details:

    http://www.ti.com/lit/an/spra953b/spra953b.pdf