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TUSB422: TUSB422 VCONN power connect

Part Number: TUSB422

Hi Team

My customer ask for TUSB422 VCONN connection. They want to know if it can use battery voltage(3.4~4.4V) not use boost 5V voltage?

It is a cell phone project. I saw spec 8.2.2 mention that type-C redefine VCONN from 3.3V~5.5V, but I just want to sure if this kind of connect to battery can work fine or not.

Do you have some expenience about this?

Thanks

Bruce