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TPS22860: TPS22860 has high leakage current when VON < VIN / VBIAS

user4633763
Prodigy 190 points
Part Number: TPS22860
Other Parts Discussed in Thread: TPS22917

Hi,

I am using TPS22860 as a load switch for 5V sensor, and I am controlling the VON pin with processor having a 3V VDD/IO voltage level. VIN and VBIAS are tied together to 5V.

The problem is that there is about 3-4mA leakage current to VIN or VBIAS when VON is set high (3V) even with no load at VOUT pin. The datasheet does not mention anything about this leakage and states that any VON voltage above threshold level 2.4V is ok when VBIAS is 5V! This is clearly not true.

When I lower VIN/VBIAS to around 3.5V the leakage disappears.

BR

  • 0
    TI__Genius 15740 points

    Hi user,

    The low leakage cases described in the datasheet are with VON=0V or VON=VBIAS. With varying conditions, the leakage an increased, such as the conditions you described.

    If you're looking for a low leakage switch that can be varied across different voltages and temperatures and maintain a low leakage, you can take a look at the TPS22917 load switch.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Prodigy 190 points
    Hi,

    Thanks for your reply!

    Yes this is what I understand now after debugging my circuit.. Unfortunately we lost one prototype spin because of this. I think you should mention such a behavior in the datasheet somewhere, now it seems more like you are trying to hide this weakness. After all, these load switches are very often use to switch some higher voltage load with processor GPIO (low voltage).

    I will go for TPS22917 or discrete PMOS solution next..

    BR