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TPS7A37: Threshold value of EN pin high

masahiko shimizu
Guru 11235 points
Part Number: TPS7A37

Hi,

My customer has a issue.
Threshold value of EN pin high is over 1.7V from datasheet.
But my customer's IC has around 1.088V.
Could you confirm threshold value of EN pin high at your bench?
The detail of this issue shows the attached file.

Detail of issue.pptx

Best regards,
Shimizu

  • 0
    TI__Genius 10200 points
    Hi Shimizu,

    The EN pin high (enabled) characteristic specifies the minimum voltage at which all TPS7A37 LDOs are ensured to enable the output. The typical threshold will actually be below 1.7 V.

    If your application requires the TPS7A37 to enable at a specific point relative to the 5 V rail, I suggest using a voltage detector or voltage supervisor to drive the EN pin.

    Thanks,
    Gerard Copeland
  • 0 in reply to Gerard Copeland
    TI__Genius 10200 points

    Hi Shimizu,

    You can find our voltage detectors and supervisors here:

    Thanks,

    Gerard Copeland

  • 0 in reply to Gerard Copeland
    Guru 11235 points

    Hi Gerard,

    The value of EN pin high (enabled) is defined in datasheet Electrical Characteristics.


    Minimum value is 1.7V. But my customer IC's value is under against this.
    This event is quality issue.
    I request to re-check this issue.

    Best regards,
    Shimizu

  • 0 in reply to masahiko shimizu
    TI__Genius 10200 points

    Hi Shimizu,

    The EN pin is a digital input. The "EN pin high (enabled)" spec defines the input voltage range for logic high in which the TPS7A37 is ensured to enable the output. To meet this spec, the device will actually become enabled in the gray area between the two thresholds. 

    This is not a quality issue as all digital pins will display the same behavior and change state somewhere in their specified indeterminate region. The standard practice for linear regulators is to define these pins with logic high and logic low thresholds instead.

    Thanks,

    Gerard

  • 0 in reply to Gerard Copeland
    Guru 11235 points
    Hi Gerard,

    Thank you for your support.
    This answer is very helpful for me.

    Thanks.

    Best regards,
    Shimizu