TPS22960EVM: TPS22960

Hello Chaitanya,
There are two main parts to this issue:

"But when I am disabling all the voltage sources and connecting external pullup the TPST switch is taking current."
1. The TPS22960 is a Quick Output Discharge device, when the switch is disabled the output is connected to ground through a resistor.
2. To remedy this you will need a device without Quick Output Discharge.

"The TPST switch should not allow the current to pass through it."
1. By this, do you mean that the current is flowing from the output to the input of the TPS22960?
2. If so, you would need a device that also has reverse current protection

The TPS22963C is a similar device to the TPS22960, except it does not have Quick Output Discharge and it does have Reverse Current Protection. Would this device work for your application?

Best,
Nick

TPS22960 is connecting output to ground when we give enable as logic zero. I don't want that to happen because  when I connect external pullup the current is flowing to ground through the output pin of spst switch. I want a switch which will isolate the output and input pin. It should not allow the current to flow through it when it is turned off.

"  "The TPST switch should not allow the current to pass through it."
1. By this, do you mean that the current is flowing from the output to the input of the TPS22960?
2. If so, you would need a device that also has reverse current protection"

The current is flowing from output to ground when the switch is disabled. I also have a  doubt what if I have a voltage source at the output side and output voltage is greater than input. 

Thank you for the clarification.

The TPS22963C has the correct feature set to solve for the issues you are having with the TPS22960.

Best,

Nick

I will be connecting all the sources at one point as shown in the schematic and enabling only one source. Is it confirm that it will not sink through other switches using TPS 22963C, Because when I am going to simulate I am getting convergence error.

Connecting the outputs together at one point and only turning on one at a time is fine.

Current will not sink from the output to ground through the TPS22963C because the TPS22963C does not have Quick Output Discharge.

The convergence error is best answered by the modeling forum, I see your other post has already been moved there:
e2e.ti.com/.../580204

Best,
Nick

But when I am trying to simulate it is showing convergence error. Also my current rating is at max 500-600mA, But the switch rating is 3A. Is it fine to use that in this application. I am attaching the simulation model can you verify that. (Enable each and every voltage 3.3,5,1.8) Also enable pullup switchTPS22963C.TSC

Assume that the device is turned disabled. I have connected a voltage source at the output whose voltage is more than input voltage. Will the switch conducts ( enable pin is grounded)?

Hi Chaitanya,

To add to Nick's previous points, current can flow from VOUT to VIN through the body diode.

Regards,

Daniel Foncannon

Chaitanya,

What Daniel mentioned is correct, for the TPS22960; in situations where Vout is higher than Vin, current will flow through the body diode of the pass FET.

But, the TPS22963C, that was suggested and that you have switched to, has reverse current protection which will stop this current from flowing from Vout to Vin.

Best,

Nick