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LM66100: Iout,Off at 65°C ?

Robert Finger
Genius 17367 points
Part Number: LM66100

Team,

A customer of mine is designing an application where LM66100 should be used for power ORing between a battery and an external power supply. 

They would like to know how the Iout,Off (Vout-Vin<1V, Vce>Vin+80mV) will be at 65°C. The datasheet only gives a max value for -40 to 85 °C. But my customer would like to know what to expect at 65 °C. Can we give a worst case estimate?

Thanks,
  Robert

  • 0
    TI__Mastermind 32650 points

    Hi Robert,

    At 65C the -40C to 85C value should still be used for worst case. Is the current too much for the customer?

  • 0 in reply to Shreyas Dmello
    TI__Genius 17367 points

    Hi Shreyas,

    The 0.7uA from the datasheet could be an issue, as one of the sources is a battery. If LM66100 is putting the power supply voltage onto Vout, reverse current could flow back to the battery. The battery used does accept ~0.15uA backward current, but 0.7uA would be too much and could damage the bat. 

    Therefore my customer is hoping that max reverse current is lower at 65 °C or below. 

    If not, what else could be done to avoid reverse current to the battery?

    Thanks,
      Robert

  • 0 in reply to Robert Finger
    TI__Mastermind 32650 points

    Hi Robert,

    While the reverse current may be lesser at 65C, I do not think it will be as low as 0.15uA.

    I think a workaround might be to use two low leakage load switches instead of the ideal diode to MUX sources. This means that a slightly more involved control scheme will be needed (to control the ON pins of the two devices) but I think it open you up to using low leakage devices.

    Is this an acceptable alternative?