The power consumption of the device varies depending upon the operating conditions and the load current. There is no specfication in the datasheet that addresses the power consumption of the device however, there is a specification of Supply Current (Ground Current) with typical and maximum values of 96uA and 136uA (at 300mA output) respectively at page 2 of the datasheet. These current values should be used as a guidance to calculate the power consumption of the device. There are also two graphs on page 4 of the datasheet named GROUND CURRENT vs. INPUT VOLTAGE for no load and 300mA load.