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TPS2121: Unwanted leakage current. What could be the cause?

Wolfgang Walter1
Prodigy 80 points
Part Number: TPS2121

Dear Sir or Madam,

I have a design with the "TPS2121RUX". The Power management regarding switching between battery and main supply (by a regulator) works fine. I use the inputs OV1 and OV2 to give the switch an output enable and use a high signal level by a controller.

When OV1 and OV2 are high. The supply at IN1 is disabled and on IN2 is connected a battery with 4V. I can see that there is still a current flow into IN2 with approx. 115µA. I want to reduce this current. Where/why is this flow coming from? Any ideas?

Regarding the datasheet the leakage current in this standby should be lower:

I use follow configuration. In blue to see the state where I have the 115µA:

Follow schematic I have:

Thanks beforehand for your efforts.

Best regards

Wolfgang Walter

  • 0
    TI__Genius 13260 points

    Hello Walter,

    Since IN1 is disabled/lower than IN2, IN2 will need to provide more of the quiescent current to power internal blocks. Try measuring IN2 when IN1 is prioritized and both rails are considered stable. If you're still seeing 115uA please reopen this thread.

    Regards,

    Kalin Burnside