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LSF0108 application operating condition

Jacky Chen29
Genius 4735 points
Other Parts Discussed in Thread: LSF0108

Hola,

By LSF0108 datasheet, the operating condition as below：

But it's Vref_A=2.85 and Vref_B=3.3 in our design, so we can not meet the condition, I want to know that if we can’t meet this specification, what issue will be happened？

  • 0
    TI__Guru* 96591 points
    Just out of curiosity -- why are you using voltage translation for two signals that are so close together? It should not be required.

    As for what will happen -- the LSF0108 is usually biased using a 200kohm resistor which limits the bias current to approximately 1 to 10 uA through the bias FET. If there is not enough voltage differential here, the gate voltage will not be high enough to turn that FET on, and thus the entire device will be turned off (ie all i/o pins will be high impedance).