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TPS62913: how to improve EMI radiation

Part Number: TPS62913


In my board I use 3 devices from TPS62913 types.

How should I connect them to prevent as much as I can EMI issues?
First DCDC:
VIN = 9V; VOUT = 1V @ 1.5A

Second DCDC:
VIN = 9V; VOUT = 3.6V @1.3A

Third DCDC:
VIN = 9V; VOUT =5V@ 1A.

The first and second DCDC always on and the third selected with EN.

Can I sync them without external clock?