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TPS7A4501-SP: Dropout for 5962R1222403VXC 1.5A version at 2.8V

Thibaut Gantner
Prodigy 20 points
Part Number: TPS7A4501-SP

Dear TI team,

I have some trouble in analysis with the TPS7A4501-SP (1.5A version) regarding the dropout that is mentioned in the datasheet for a vout of 19.3V. I would need a way to compute the dropout for a vout of 2.8V@100mA load.

I have the exact same issue as this post: https://e2e.ti.com/support/legacy_forums/hirel/f/space-high-reliability-forum-read-only/658334/tps7a4501-sp-dropout-for-5962r1222403vxc-1-5a-version-at-3-3v/2418553#2418553 (except i want to compute @2.8V)

But i'm unable to open a related question.

One of your expert responded via e-mail to the other guy, would it be possible to have access to those data? i have 18 of these chips in hand, and no solution to use them after our worst case analysis that use the maximum dropout voltage of 0.58V,

Thanks for your help.

  • 0
    TI__Genius 10970 points

    Hi Thibaut,

    For your stated operating conditions (VOUT=2.8V, IOUT=100mA), we would expect a nominal dropout somewhere between 50-100mV. 580mV is a conservative worst case that applies for VOUT=19.3V, but there is another section of the datasheet Electrical Characteristics table that shows VDO for VOUT=2.4V, which is closer to your operating condition. This states 130mV as a worst case for 2.4VOUT @ 100mA. 

    If you wanted or needed to further narrow your expect worst-case, you could use 1) the datasheet temperature graphs and 2) the Group C TID Radiation Report that was shipped with your order. One of those TID reports is also published to the part's webpage. The standard deviation shows part-to-part variation and the pre/post-test drift shows radiation impact. 

    Thanks,

    Sarah

  • 0 in reply to Sarah Koch
    Prodigy 20 points

    Dear Sarah,

    Thanks for your fast answer.

    Regarding the radiation report, you point me towards the page 25 that describes how the Vadj value drift over different bias condition as well as different TID value.

    I am sorry, but I don't directly get it how to transpose it to the dropout voltage..

    Anyways, thanks for your prompt help.

    I wish you a great day.

  • 0 in reply to Thibaut Gantner
    TI__Genius 10970 points

    Hi Thibaut,

    Happy to help! Page 25 should direct you to Test 200.1 for VDO with VOUT=2.4V @ IOUT=100mA.

    All the best,

    Sarah