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LMS3655-Q1: Confirmation of Ta (MAX)

Dice-K
Mastermind 6330 points
Part Number: LMS3655-Q1

Hi support team,

I wanna confirm Ta (MAX).
It is different between "ROC" and "PACKAGING INFORMATION".
Which one is correct?

Page-5, SNAS714C

Page-49-50, SNAS714C

・・・

Regards,
Dice-K

  • 0
    TI__Mastermind 47060 points

    Hi Dice-K,

    Let me take a look at this and get back to you when I get more details.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    TI__Mastermind 47060 points

    Hi Dice-K,

    I've reached out to the internal team and product engineer to get more insight on this.

    From initially inspection I'd suspect that the "Op Temp" is referring to junction temperature since the device can not be operated at ambient temperature of 150C without hitting thermal shutdown with the part switching. As such I think this is a typo or needs clarification, but I'll get some confirmation on this and get back to you when I get more details.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Mastermind 6330 points

    Hi Jimmy,
    Thank you for your support.

    Looking at other data sheets, "Op Temp" in "PACKAGING INFORMATION" seems to be ambient temperature (Ta).

    Example. Pages 3 and 17.
    www.ti.com/.../tps54225.pdf

    Is "PACKAGING INFORMATION" of LMS3655-Q1 a typo?

    Best regards,
    Dice-K

  • +1 in reply to Dice-K
    TI__Mastermind 47060 points

    Hi Dice-K,

    That could be the case since those numbers are automatically generated.

    Again I'd like to be clear that if the device is in 150 ambient temperature and switching, knowing that the device is not 100% efficient, there will be some power dissipation and as a result the device will increase in temperature. 

    The datasheet shows a minimum thermal shutdown of 160C so it wouldn't make much sense to operate the device at 150C ambient in any case. As such, I would suggest customers look at the electrical characteristics table for guidance since those parameter/specs have been thorough inspected and the packing information might be a typo.

    Regards,

    Jimmy