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Original question:

BUF602: BUF602 as capacitive gate load driver?

BUF602: BUF602

Doug Widney
Prodigy 30 points
Part Number: BUF602

Hello Again:

Does anybody know the output overdrive recovery time of a buf602?

This is a case where its input might go to the negative rail (gnd for single supply), and the output can't reach the rail.  What then is the recovery time?

It's not quite the same, I admit, as output overdrive recovery for a regular op amp, where input voltage times gain theoretically puts the output beyond the rails--we're always at unity gain for the 602 obviously.

rgds.,

Doug Widney

  • 0
    Guru 48395 points

    Good question, not sure why I did not put that in the datasheet, normally would do that for an op amp, 

    Anyway, it does say it needs a 1.3V  output headroom - but, if your are going to 0V input on single supply input, that input stage is saturated also and may dominate recovery time - we did not try to sort out input vs output range - perhaps on oversight. 

    I would try it on the bench 

    1. should be ok, but you may need a fault limit input current limiting R (too high there will hurt BW and noise). 

    2. your output loading might influence recovery time, 

    We never spec worst case overdrive recovery as it depends on the minority carrier lifetime in saturated junctions - not usually toleranced in a PDK. It is often not modeled either, so bench is best then guardband at lest 1.5X.