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Original question:

TLV766-Q1: Pull up resistance of EN pin

TLV766-Q1: Power management forum

Bhavya Vira
Prodigy 10 points
Part Number: TLV766-Q1

 We are planning to use TLV766-Q1 (5V fixed version) for our project. It is written in the datasheet that the EN pin has an internal resistance. However our requirement is that initially the IC must be in OFF state, after 2 seconds the microcontroller shall pull the EN pin high to enable the device. 

My question is that since the IC has an internal resistance, a resistor of what resistance should i use to pull the EN low so that the IC remains off, despite the internal resistance.

 

  • 0
    TI__Genius 12511 points

    Hi Bhavya,

    With a 800nA En pin current, and a rough estimate of 6.25Mohms of resistance on the EN pullup it would depend upon the input condition that you have and the tolerances for quiescent current for the MCU.

    But the information is that the EN pullup resistor is ~6.25Mohms of resistance and the maximum current flowing through that when EN is grounded is 800nA. Design using these two parameters.

    Regards,

    John

  • 0 in reply to John Schneider
    Prodigy 10 points

    If i use 100kohm resistor as a pull down on EN pin, will the IC be in OFF state when i power the system?

  • 0 in reply to Bhavya Vira
    TI__Genius 12511 points

    Hi Bhavya,

    with a 100kohm resistor the resistor divider would equate the EN voltage to be ~0.016xVIN. With a Ven of 0.4 for Ven low, then a VIN of 25V or lower would have the device disabled, which means for all corners of operation VINMax of 18V, then the device will be disabled as you desire.

    Regards,

    John