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DS15BR401: max pkg power capacity

[FAE] Andrew Wang
Genius 10685 points
Part Number: DS15BR401

Hi Team,

In Datasheet page4, pkg power capacity shows 1.64W for TQFP, and 4.16W for WQFN.

If we do the math MAX Vcc * MAX Icc = 3.6V * 215mA = 0.774W.

it doesn't add up, so customer would like to know what is pkg power capacity number meaning?

Thanks.

Andrew

  • 0
    TI__Mastermind 43795 points

    Hi Andrew,

    The maximum package capacity is related to the thermal performance of the package and the maximum junction temperature of the DS15BR401.

    At room temperature of 25C, a theta JC of 30 degrees C/W, and a maximum junction temperature of 150C.  The most power that the package can dissipate is 4.16 Watts.  While dissipating 4.16W at a temperature of 25C, the junction temperature will rise to 150C.

    The worst case DS15BR401 power is well below this number.  At a worst case of 0.774W and temperature of 85C, the junction temperature should rise to approximately 85C + (0.774W x 30 C/W) = 108C

    Regards,

    Lee