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Original question:

TPS25200-Q1: EN pin Hysteresis question

TPS25200-Q1: TPS25200QDRVTQ1 || EN pin Logic

Shine Jo Tom
Prodigy 110 points
Part Number: TPS25200-Q1

Hi,

I'm using TPS25200QDRVTQ1 in my design and I need to use the ENABLE pin. It seems from datasheet that the turn ON threshold is 1.9V and also I noticed about the 330mV hysteresis but the system that gives me the EN logic voltage is only 1.8V. Would that work fine? Or does it mean I need to use a level translator?

I did check working of the ENABLE pin on a different design that uses it and provided a 1.8V and it worked fine all the way up to 1.48V but is it reliable since there's a mention of 1.9V in the datasheet? I'm in a situation where I don't have any other voltages other than the input voltage coming from host power supply and this 1.8V logic ENABLE.

Please advise

  • 0
    TI__Guru 56470 points

    Hi Shine,

    Yes it can go max upto 1.9V after considering process, voltage and temp variation. Typical value is less so you can see working at 1.48V. For robust design you can consider using level shifter. Otherwise you can check TPS25210 device. It is new generation device with EN threshold as 1.2V.

    Regards

    Kunal Goel 

  • 0 in reply to Kunal Goel
    Prodigy 110 points

    Hi Kunal,

    Thanks for the input. Does this mean it's unreliable to make the EN pin work with 1.8V logic? This is a tough situation because I need this automotive efuse and also the input to the efuse can only be 1.8V and I feel it's risky to use the input voltage (5V) itself as one of the voltage for level shifter as any overvoltage condition above absolute maximum, could mean the level transalator will be damaged. Could you advise if there are anyway of resolving this issue?

    Additionally, could your review this circuit especially the current limits that has been set (target values given in the small dashed box).

  • 0 in reply to Shine Jo Tom
    TI__Guru 56470 points

    Hi Shine,

    You can do something like below:

    Otherwise schematic looks fine.

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    Prodigy 110 points

    Hi Kunal,

    Thanks for this suggestion. It should work fine but I would like to get a non-inverting logic here with minimum components. Do you know of any non-inverting buffers, logic gates that has tolerance to a very high voltage supply values and at the same time work with an input logic level of 1.8V?

  • 0 in reply to Shine Jo Tom
    TI__Guru 56470 points

    Hi Shine,

    You can check logic gates on ti.com. 

    Regards

    Kunal Goel