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TPS7A20: Abs Max Voltage - Any Issues?

Connor Connaughton
Expert 4470 points
Part Number: TPS7A20

Hi Team,

I’m using the TPS7A2028 and I really like it.  I’m currently powering the dispenser with 3 alkaline batteries (1.5VDC each, 4.5VDC total) in series.  There is a possibility that I may move to 4 alkaline batteries.  That would be a total of 6.0VDC.  However, all new alkaline batteries are overcharged to 1.6VDC, which makes the total 6.4VDC for a short time.  The absolute Vin for the TPS7A2028 is 6.0VDC.  Is there some fudge factor there?  Could it handle the overcharge?  If not, is there an LDO with similar specs that could handle 4 alkaline batteries?

Thanks!

Connor

  • 0
    TI__Mastermind 38115 points

    Hi Connor,

    The abs max rating for TPS7A20 is 6.5V, so yes it can handle 6.4V (if that is the actual max it would see). The thing to understand here is that this is an operating point that is outside of the datasheet specifications so performance is not guaranteed when using VIN > VIN (recommended max). With that said, I don't expect the performance to be very different with VIN = 6.4V; I would guess that the differences would be in the line regulation spec, but 400mV is a pretty small deviation so the effect will be very small (much less than the 0.03%VOUT line reg spec), and potentially the quiescent current draw, which I also expect to be very small (on the order of 1~2μA). 

    Regards,

    Nick