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TPS7A49: Enable Pin Threshold Tolerances

Paul Rankin
Prodigy 90 points
Part Number: TPS7A49

Is there any data I can use to determine what appropriate thresholds may be for the enable pin thresholds on the TPS7A49?  From what I see on the datasheet, it seems to indicate that an enable voltage greater than 2.1 V is sure to enable the device, and an enable voltage lower than 0.4 V is sure to disable the device.  Is there any data to indicate, for instance, what is the lowest enable pin voltage at which the device may turn on, or conversely, what is the highest enable pin voltage at which the device may be disabled?  Also, if there is any information regarding any kind of hysteresis on this pin, that would be good to know as well.

  • +1
    TI__Mastermind 37065 points

    Hi Paul,

    The following figure from the datasheet gives additional data on the enable voltage thresholds.

    I measured an EVM with a very slow enable voltage ramp to find the hysteresis.  Vin = 5V.  The green ramp is the enable voltage and the blue waveform is Vout, which is set to 3.3V. 

    I had to zoom way into the waveform.  The LDO begins turning on at Ven = 1.6954V, and it begins turning off at Ven = 1.686V.  So the hysteresis looks to be 1.6954 - 1.686 = 9.4 mV or roughly 10mV. 

    Thanks,

    - Stephen