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TPS62420: wider temperature range

Howard Zou
Genius 12365 points
Part Number: TPS62420

Hi,

my customer is using TPS62420 and they would like to extend the operating ambient temperature range to 105C.

So I find TPS62420-Q1, but the only difference is:

We only specify TPS62420-Q1's operating junction temperature to -40-125C. We don't specify its operating ambient temperature.

We specify TPS62420's operating junction temperature to -40-125C, and operating ambient temperature to -40-85C.

My question is:

Is TPS62420-Q1 operating temperature wider than non-Q1 version?

My understanding is: as long as the operating junction temp is less than 125C, the device would be okay(Q or non-Q version), then why we specify the ambient temp range?

In this specific case, any device could be recommended to upgrade TPS62420?

  • 0
    TI__Mastermind 19230 points

    Hi Howard,

    TPS62420 & TPS62420-Q1 datasheets were released at different times and by different people. Hence we find some small discrepancies. But we are working on the standardization of the datasheets and this will be applicable only for our newer releases.  

    In the datasheet of TPS62420, both Ta & Tj are specified under 'Recommended Operating Conditions'.

    In the datasheet of TPS62420-Q1, only Tj is specified under 'Recommended Operating Conditions' but we can see that the 'ELECTRICAL CHARACTERISTICS' have been specified for Tj= Ta = –40°C to 125°C (unless otherwise noted). I hope this answers your question.

    You can have a look at our portfolio from the website for our newer devices or if you provide the application requirements, I can help you as well!

    Regards,

    Febin

  • 0 in reply to Febin
    TI__Genius 12365 points

    Febin,

    then why could we achieve Tj=Ta? In real application, Tj is always higher than Ta from my knowledge.

    So in your opinion, both TPS62420 and TPS62420-Q1 have the same operating Ta & Tj range?

  • 0 in reply to Howard Zou
    TI__Mastermind 19230 points

    Hi Howard,

    My understanding is, from the device perspective we are interested in Tj. The ambient depends on the application itself.

    Ta temp range at which the device electrical parameters are characterized is normally mentioned before the 'ELECTRICAL CHARACTERISTICS' table.

    For eg: if we mention  Tj= Ta = –40°C to 125°C (unless otherwise noted), it means that the electrical parameters of the device is characterized for the whole range. So the application's ambient shall be within this range. But typical values in the table are always measured at Ta= 25°C

    Regards,

    Febin

  • 0 in reply to Febin
    TI__Mastermind 19230 points

    Hi Howard,

    I hope my answer helped you. I would like to go ahead and close this thread.

    Please reach out to us for any further support.

    Regards,

    Febin