A linear regulator operates from a 2.5-V supply and is used to deliver 70 mA at 1.3 V. What is the efficiency of the regulator, neglecting the power consumed in the amplifier? How much current can the...

A linear regulator operates from a 2.5-V supply and is used to deliver 70 mA at 1.3 V. What is the efficiency of the regulator, neglecting the power consumed in the amplifier? How much current can the amplifier consume while maintaining an efficiency better than 50%?