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TPS2051B: Wrong VIH threshold

AGXIN
Intellectual 510 points
Part Number: TPS2051B
Other Parts Discussed in Thread: TPS2041B

Hi 

I am using this part TPS2051BDBV in one of my design (I have connected this switch through a 1.8V logic pin from processor ) but the Minimum Input voltage threshold mentioned in datasheet for this pin is 2.V 

Will this create any potential issue during long run .Currently this logic is working fine but due to temperature variation will this create any issue ?. 

What is the exact threshold above which output voltage will be switched . Board has fabricated so difficult to change logic now so please advice (let me know if a low Enable threshold part is available for this load switch which is foot print compatible  ) 

  • 0
    TI__Expert 8980 points
    Hi, AGXIN,

    I am little confused. What does the 'input voltage' that you mentioned imply? Vin or EN? From my understanding, you connect EN pin to 1.8V logic pin from processor, it that correct.

    If it's correct. I suggest you use TPS2041B which has EN logic low turn on power switch and has same package with TPS2051B. The low level EN threshold is 0.8V. Please refer to datasheet for detailed information.

    Thanks.

    Regards,
    Bob
  • 0 in reply to Bob Ma
    Intellectual 510 points

    Hi 

    Thanks for the info.

    What does the 'input voltage' that you mentioned imply? Vin or EN? 

    Enable Pin---high threshold  VIH-----2V

    yes you are correct we have used 1.8V logic for enable pin from processor 

    we have seen the logic inverted part TPS2051B. but the parts are already assembled on the board and are working fine in 1.8V logic of Enable pin when running in LAB 

    But the question is if this will be misbehaving with temperature ?

  • 0 in reply to AGXIN
    TI__Expert 8980 points
    Hi, AGXIN,

    We don't guarantee the part's behavior beyond datasheet. You will take some risk if you keep to use this way.

    Regards,
    Bob