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LP2992: Differences new-chip legacy chip

Paolo Mattachini
Intellectual 260 points
Part Number: LP2992

Tool/software:

Hello,

my customer is experiencing some malfunctions on a product that is based on LP2992, SOT23-5 package.
I noticed today that it has been introduced a new version with a significantly lower threshold on the ON/OFF pin and this could actually be the root problem.

I have several questions in regards:

  • when was this new product launched? the malfunctioning products have been assembled in the early 2024, is it possible that the already mount the new chip?
  • How could I tell if there is mount the legacy or new chip? is there a different marking?
  • Our operating conditions are Vin: 9Vdc, Vout: 5Vdc, Iload 50mA and the applicable temperature range is -10 +60 degrees, in these conditions is it safe to assume the ON threshold is 0.85V?

Thank you for your help

Paolo

  • 0
    TI__Expert 6320 points

    Hi Paolo

    I have inquired about when these newer devices were shipped out and will get back to you as soon as I hear back. Devices can ship with the legacy chip or the new chip. The reel packaging label provides CSO information to distinguish which chip is being used. 

    There is a date code on the top-side of the devices from which we can deduce if it is new or legacy. I will share here once I have details about those dates.

    Could you have the customer send pictures of any labels on the reels? These usually show the CSO and will help us figure out if there are newer or legacy devices.

    For the operating conditions you mentioned, the typical ON threshold during testing was 0.85V. However, the max value across temperature was 1.6V. So the devices can turn on anywhere within that range with most devices turning on closer to the typ value.

    Best Regards

    Ishaan