TPS22975: Beahavior with and without Vbias

TISL

Part Number: TPS22975

Dear E2E Community,

Could you tell us what's the behavior of the load switchs such as the TPS22975 when Vbias is not present, while a voltage is applied on Vin?

My main concern is the leakage current on Vin when the chip is not powered.

Regards,

over 7 years ago

0 Aleksandras_Kaknevicius over 7 years ago

TI__Genius 15710 points

Hi TSIL,

When VIN is applied and VBIAS is not present, is the ON pin pulled low or high?

In general, the device will not be able to turn on without the VBIAS voltage present.

Thanks,

Alek Kaknevicius

0 TISL over 7 years ago in reply to Aleksandras_Kaknevicius

TI__Expert 3795 points

Hi Alek,

In this configuration, the ON pin would be connected to Vbias.

So the goal is to get a very low leakage current on Vin when Vbias is not present (i.e. when load switch is OFF).

Can we consider the numbers in the datasheet in that case (2nAtyp for Vin=3.3V) ?

Regards,

0 Aleksandras_Kaknevicius over 7 years ago in reply to TISL

TI__Genius 15710 points

Hi TISL,

I just checked it out in the lab, and when VBIAS and ON are pulled low, the VIN leakage at 3.3V is indeed ~2nA. Also, the output did not come up at any point when VBIAS was not present.

Thanks,

Alek Kaknevicius

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TPS22975: Beahavior with and without Vbias