Other Parts Discussed in Thread: TPS53681, TPS53647
How to use 2 x TPS40322 as Master and Slave (4 channels)?
These 2 pictures below are from datasheet. Apart from SYNC pin, what pin that I must connect between 2 x TPS40322.
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The sync picture in your post just shows how to sync achieve 90 degree phase shift between all four phases. The purpose is to reduce the input voltage ripple and noise.
This circuit can not achieve current sharing between four phases. That's why 2xTPS40322 can not be used for 4phase, one output design.