TPS22966: TPS22966

Naveen kumar

Prodigy 10 points

Part Number: TPS22966
Other Parts Discussed in Thread: TPS22960

Hi,

I would like to use two different voltage levels at Vin1 and Vin2. Can Vbias be constant irrespective of Vin?

over 3 years ago

0 Dhanyasree Prem Sankar over 3 years ago

TI__Expert 4260 points

Hi Naveen,

You can have two different Vin voltages for the same Vbias voltage. Make sure that your Vbias voltage is set to your highest Vin voltage or above.

Regards,

Dhanya

0 Naveen kumar over 3 years ago in reply to Dhanyasree Prem Sankar

Prodigy 10 points

Hi Dhanya,

Thanks for your reply.

In my case Vin1 will be of variable between 4.2 to 3.1 (Battery supply) and Vin2 is fixed at 5V. Vin2 will come in to picture, whenever the device is under charging.

Can I tie Vbias to Vin1 or it should be with a constant power supply?

Since Vin2 is not a continuous supply, I couldn't tie it to Vbias though it's the highest Vin.

Please suggest what can be done.

0 Dhanyasree Prem Sankar over 3 years ago in reply to Naveen kumar

TI__Expert 4260 points

Hi Naveen,

I would suggest that you connect the Vbias to a separate constant power supply/power rail of 5V or higher that has no association with either Vin1 or Vin2.

Thanks,

Dhanya

0 Naveen kumar over 3 years ago in reply to Dhanyasree Prem Sankar

Prodigy 10 points

Can the Vbias pin be left floating?

0 Dhanyasree Prem Sankar over 3 years ago in reply to Naveen kumar

TI__Expert 4260 points

Hi Naveen,

No, you cannot leave the Vbias floating. During operation, VBias must be equal to or greater than Vin.

Thanks,

Dhanya

0 Naveen kumar over 3 years ago

Prodigy 10 points

Hi Dhanya,

Could you please suggest an alternate part without Vbias. In my application, Vin2 is not always available which is the highest input voltage and Vbias cannot be switched between Vin1 and Vin2.

Can i short Vin1, Vin2 and Vbias? So that whatever voltage level is tied to Vin, Vbias can be tied to the same level.

0 Dhanyasree Prem Sankar over 3 years ago in reply to Naveen kumar

TI__Expert 4260 points

Hi Naveen,

The only dual channel load switch we have that does not have a VBias is the TPS22960. Additionally, if you short Vin1, Vin2, and VBias together, then you can have reverse current event toward your supply that is not powered.

Thanks,

Dhanya

0 Naveen kumar over 3 years ago in reply to Dhanyasree Prem Sankar

Prodigy 10 points

What happens if any one of the voltage is greater than Vbias during operation.

0 Dhanyasree Prem Sankar over 3 years ago in reply to Naveen kumar

TI__Expert 4260 points

Hi Naveen,

VBias should not be greater than the Vin voltages because the gate of the FET will not be biased properly and we cannot guarantee any values on the datasheet.

Thanks,

Dhanya

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TPS22966: TPS22966