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LMV358: output response with VCC going gradually to zero with unipolar configuration.

Vishal Kulkarni
Prodigy 40 points
Part Number: LMV358
Other Parts Discussed in Thread: TLV9002, TLV810E

What will be the output voltage of the LMV358 if VCC is varying in non-inverting voltage follower with in loop-compensation? The VCC level is coming from 3.3V to zero gradually decreasing to zero. Also the input to non-inverting amplifier is given through same VCC which is further connected to shunt reference and voltage divider to obtain 1.5V of output when input is 3.3V. 

  • 0
    Guru 274540 points

    Below the minimum recommended supply voltage of 2.7 V, correct operation is not guaranteed. You could do your own tests to see what happens. But there might be temperature dependencies, and again, there are no guarantees.

    If you must ensure that your circuit does nothing wrong at low voltage, it might make sense to use a voltage supervisor like the TLV810E and opamps with shutdown like the TLV9002‍S.

  • 0
    TI__Guru*** 146886 points

    Hello Vishal; welcome to the e2e forums.

    A rail to rail input op amp that has a low minimum supply voltage will be more predictable.

    LMV358 is neither RRI nor runs at low voltage. Below 2.5V isn't good, see figure 11 for insight.