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TPS53355: Maximum Enable threshold value consult

Stanley Dai
Expert 5810 points
Part Number: TPS53355
Other Parts Discussed in Thread: TPS53353, , TPS548D22

Hi Team,

Customer wants know the maximum enable threshold value of TPS53355/TPS53353 for testing. Pls kindly help us here. Thanks.

Best,

Stanley

  • 0
    TI__Expert 5241 points

    Hi Stanley,

    This is a common misunderstanding.  This spec in the datasheet means that as long as the customer applies >1.8V on EN pin, the part will be enabled.  It does not represent the actual EN threshold.  As a matter of fact, the actual EN threshold would have a max spec of 1.8V in the ATE program.  Same logic applies to the Disable threshold.

  • 0 in reply to Tomoya Ide
    TI__Expert 5810 points

    Hi Tomoya,

    Thanks for your explanations here. Actually customer adds bypass capacitor to slow down the Enable pin voltage slew rate for controlling the power-up time. So Enable voltage will take nearly 1.2s rising from 0V to 1.8V here. 

    They want to know what's the minimum value which may trigger on our device. Because they need this info to do system setting. Could you pls provide the minimum value may trigger on our device of TPS53355/TPS53353? Thanks.

    Best,

    Stanley

  • 0 in reply to Stanley Dai
    TI__Expert 5241 points

    Hi Stanley, 

    According to the specification, EN could transition from OFF to ON at any voltage above the maximum specified “OFF” voltage (0.6V).  While a “typical” device will likely have a much narrower EN transition threshold, TI does not test for or warranty such operation.

  • 0 in reply to Tomoya Ide
    TI__Expert 5810 points

    Hi Tomoya,

    Thanks for your comments. I find our TPS548D22 will list the min EN on threshold in D/S, but our TPS53355/53 doesn't as I show above. What's the reason for that, related w/ internal test or just test procedure here? 

    Best,

    Stanley

  • 0 in reply to Stanley Dai
    TI__Mastermind 48180 points

     

    The TPS548D22's EN_UVLO pin was designed to be able to serve as both a logic-input Enable / Disable feature and a resistor programmable under-voltage lock-out feature.  In order to serve as an accurate resistor programmable under voltage lock-out input, the EN_UVLO pin needs to have an accurate analog comparator and reference.

    The TPS53355's EN pin was not designed to be used as an under voltage lock-out feature, but only as a logic Enable / Disable input.  As such, the internal circuitry is not designed to provide an accurate part to part repeatable threshold.  It's specification, which defines the input voltage required to achieve specific logical states (Enable / Disable) is consistent with that digital logic input function.

    Here is an example from a Dual OR gate: