How can i find total power consumption of the device from its datasheet?
How can I find power consumption of TPS7A7001 regulator?


Assuming that Vin = 2.5 volts and Vout = 1.8 volts with a 1A load (just me putting some numbers together), the first thing to note is that the voltage dropped across the regulator is 2.5v - 1.8v = 0.7v and this voltage multiplied by the 1 A current will produce heat directly from the device at a power of 0.7 watts.

The feedback resistors R1 and R2 (in series across the output) are, according to table 1 in the data sheet something like 100kohm and this will consume 32 micro watts (barely nothing compared to the main power dissipation above).

There is some ground pin current and this is only loosely specified as 3mA - this is drawn from the incoming power rail hence it will dissipate 2.5v x 3mA = 7.5mW (again this is trivial compared to the 700mW main dissipation.