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TPS737: Pls. give some advice about the datasheet of TPS73701? Is there some contradictory information?

Lian Wu
Genius 5250 points
Part Number: TPS737

Dears:

Customer is evaluating TPS73701 in his new project, but we find there are some question about the PN.

1. Why the formula is Vin=Vout -0.1V? Is the general formula Vout=Vin- const?

2. From the before Table the Vdo is 500mV, and from the below Picture the Vdo is 180mV, why is not the same parameter?

Pls. give some advice, many thanks a lot!

  • 0
    TI__Guru 55940 points

    Hi Lian,

    In order to measure the dropout condition we must first force the LDO into dropout.  One common method is to set Vin below the set regulated output of the LDO.

    The Electrical Characteristics table state the maximum specification for dropout to be 500mV over the given conditions.  Another way to view the maximum specification of 500mV is that it is the worst case dropout that you should see for this device over the operating conditions.  The Typical Characteristics curve shows a visual representation of how the LDO the typically behaves over the given conditions.

    Very Respectfully,

    Ryan

  • 0 in reply to Ryan Eslinger
    Genius 5250 points

    Hi Ryan:

    Thanks for  your reply.

    However, customer said that he could not find any information about 'over the given conditions' from datasheet.

    And this parameter is so important that whether he use the part in this project.

    Pls. kindly help to give us more advice about the dropout parameter.

    Thanks a lot!

  • 0 in reply to Lian Wu
    TI__Guru 55940 points

    Hi Lian,

    The general conditions that for the Electrical Characteristic specification are given at the top of the table.  Next to each specification conditions specific to that specification are given.

    Similarly the general conditions for a Typical Characteristics curve are given at the top of the page while specific conditions to the curve are given below or within the curve.

    Very Respectfully,

    Ryan