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TPS22965: How does this part function when it is turned off but an ext supply is on?

user5940158
Intellectual 660 points
Part Number: TPS22965

Hello.  I'm using the TPS22965 as both a load switch and for isolation when connecting an external supply.  The external supply voltages (4 switches) will be 3.3, 2.5, 1.8, and 1.5V.  I'm concerned that this part has an internal output load resistor which will consume power (14mA for the 3.3V case).

  • 0
    TI__Genius 13760 points

    Hi,

    The QOD(Quick Output Discharge) function will only discharge the output of the load switch when the device has been disabled. When the load switch is disabled, it will still have some leakage on the VIN and VBIAS pins of the device. This leakage current is denoted as the shutdown current in the datasheet. The leakage current for VBIAS = 5V was recorded as max 2uA. For VIN = 3.3V you will see a typical leakage current at around 2nA and max 3uA across temperature. The QOD resistor will not consume any power from the input when the device is disabled.

    Best regards,

    Andy Robles

  • 0 in reply to Andy Robles
    Intellectual 660 points

    Hi,Andy

    The condition I’m asking about looks like the following.  The Load Switch is in the off state and an external 3.3V power supply is on. 

     

  • 0 in reply to user5940158
    TI__Genius 13760 points

    Hi,

    When the switch is disabled, the QOD resistor will be active and will sink current from the output. Is the QOD a feature that you would need in your application?

    If the QOD functionality is not needed you can use the TPS22965N which is the same device, but without QOD. A thing to keep in mind is that the TPS22965 does not have reverse current blocking and a voltage VOUT>VIN could potentially damage the device.

    Best regards,

    Andy Robles