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TPS54202: Quiscent Current

Naizeng Wang
Expert 5450 points
Part Number: TPS54202

Hi team,

In datasheet, the non switching quiescent current is 45uA. But in actual application, customers care more about switching quiescent current. 

I have two questions as below:

1. How to test the non switching quiescent current? In other words, what's the test condition of 45uA?

2. I think 45uA makes no sense. Why don't we test switching quiescent current and write the result on datasheet?

Best regards,

Nison

  • 0
    TI__Guru**** 191445 points

    Nison,

    I do not directly support TPS54202, but I can answer your questions:

    1.  The quiescent current is measured using the ATE in an open loop configuration.  EN is high to 5 V and the FB pin is forced to 1 V, which is above the 0.596 V reference.  Forcing VFB high causes the device not to switch and the current is measured.

    2.  The measurement you are interested in would require a closed loop test.  The switching no load current is the non switching quiescent current plus the switching current.  The switching current is application dependent.  It will vary with Vin, Vout and the output inductor value.  It is not practical to test that in ATE.