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TPS55340: How does TPS55340PWP behave when NC pin (No.11) is left open?

Part Number: TPS55340

 Hello guys,

 One of my customers is evaluating TPS55340PWP on their own board.

 They designed the board base on Webench of the device. On the Webench report, the device NC pin (No.11) was left open.

But they found TPS55340 datasheet (Version:SLVSBD4D) says that the NC pin is reserved pin that must be connected to ground recently.

 They have the following question. Could you please give me your reply for the following question?

 Q1. How does TPS55340PWP behave when NC pin (No.11) is left open?

 Your reply would be much appreciated.

 Best regards,

 Kazuya.