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TPS732xx dropout

Other Parts Discussed in Thread: TPS732

Dear Linear regulator team,

I have a new request from customer about the TPS73230 (3V fixed output version).

More precisely, my customer would have the distribution of the dropout over process and temp .

TPS732  datasheet specify Vdo=40mV typ and Vdo = 150mV max over temp and process variation @ 250mA

Gap between these two values - typ and max - is quite significant and customer will need to reduce the dropout as much as possible.

he would determine which value is more realistic in production.

Then he will adapt test in production to reject tps732 with Vdo too high for his application.

Thanks

Paul 

  • Hi Paul,

    The Electrical Characteristic specification covers the entire family of devices.  Temperature accounts for the majority of the delta.  Please see Figure 3 of the datasheet (copied below for your convenience).  The dropout for the 3V output will be similar to the dropout of the 2.5V output over temperature.

    Very Respectfully,

    Ryan

  • Hi Ryan,

    Actually, customer and I were able to find fig3 on datasheet but it doesn't not answer the question.

    If I read the figure you've copied, Vdo=60mV @ 250mA & 125degC but the max value in datasheet page6 §6.5 is Vdo=150mV.

    And so customer would know the distribution of Vdo in production. Is it a Gaussian curve? we may have such data available from factory.

    At the end, customer doesn't want to design his equipment with our device considering max values (worst case) if this case only happen on 1part per 1000 (for example). He is open to setup test in production to discriminate tps732 devices that are not ideal for his use case.

    Thanks

    Paul

  • Hi Paul,

    We do not share this type of information over the forums. We encourage customers to design to the specified worst case conditions in the electrical characteristics table and provide typcial characteristic curves to show how other factors such as current and temperature affect a given attribute.

    Very Respectfully,
    Ryan