Output power-supply control device for mobile communication terminal and method therefor

PURPOSE: An output power-supply control device outputs the output power-supply of various steps according to a transmission power level(i.e., output level), and reduces a power-consumption. CONSTITUTION: An output power-supply control device includes a battery(10), and converter(20) for converting a DC voltage applied to a battery to a predetermined level DC voltage. Resistors(R4¯R7) are serially connected between an output terminal of the converter and a ground terminal. The switches(50,60) are connected between contact points of the resistors and an output terminal of the converter, are turned on or off by a switching signal. A controller(70) outputs a switching signal which differently divides an output DC voltage of the converter according to a transmitting/receiving mode of the terminal and a transmission power level. Thereby, the output power-supply control device outputs the output power-supply of various steps according to the output level, and reduces a power-consumption.