LTM4620A input supply current when it use single 26A output?

LTM4620A : 5V ==> 4V@26A 

I want to know about input supply current of LTM4620A for singe 26A ouput.

In datasheet, input supply current is 

S(VIN) Input Supply Current VIN = 5V, VOUT = 1.5V, IOUT = 13A ==> 4.6A (typ)

                                             VIN = 12V, VOUT = 1.5V, IOUT = 13A  1.853A(typ) ,

when it specified as each individual output channel.