A mobile terminal (300, 400), in which a plurality of operative modes of a power amplifier (320, 420) module are determined by ranges (O1, O2) of a Radio Frequency, RF, signal output from the power amplifier module and the ranges are divided by abrupt changes of the current consumption without adjusting a driving voltage, the mobile terminal comprising: the power amplifier module having a plurality of the operative modes and configured to amplify a power strength of the RF signal; a modem (310, 410) comprising an RF transmitting unit (311, 411) configured to provide the RF signal to the power amplifier module, and an operative mode control unit (313, 413) configured to determine a specific one of the plurality of operative modes of the power amplifier module; a power detecting unit (330, 430) configured to detect the power strength of the RF signal output from the power amplifier module and to output a detected voltage (Vcon) according to the detected power strength of the RF signal output from the power amplifier module; a power comparing unit (350, 450) configured to: - compare the detected voltage (Vcon) to a reference voltage (Vref), and - provide a comparison result which is one of equal to or greater than the reference voltage (Vref) or less than the reference voltage (Vref); and a DC/DC converter (340, 440) comprising a first switching unit (341, 441), a driving voltage adjusting unit (342, 442), a second switching unit (343, 443) and a memory unit configured to store a plurality of driving voltages (Vout), configured to: - select, by the first switching unit, one of the driving voltages according to the comparison result of the power comparing unit (350, 450) and the operative mode of the power amplifier module, and - deliver, by the second switch unit, the selected driving voltage (Vout) to the power amplifier module, so that each of the selected driving voltage (Vout) and the detected voltage (Vcon) rises high as the RF signal output from the power amplifier module moves toward a lower range from a higher range. the power amplifier module having a plurality of the operative modes and configured to amplify a power strength of the RF signal; a modem (310, 410) comprising an RF transmitting unit (311, 411) configured to provide the RF signal to the power amplifier module, and an operative mode control unit (313, 413) configured to determine a specific one of the plurality of operative modes of the power amplifier module; a power detecting unit (330, 430) configured to detect the power strength of the RF signal output from the power amplifier module and to output a detected voltage (Vcon) according to the detected power strength of the RF signal output from the power amplifier module; a power comparing unit (350, 450) configured to: - compare the detected voltage (Vcon) to a reference voltage (Vref), and - provide a comparison result which is one of equal to or greater than the reference voltage (Vref) or less than the reference voltage (Vref); and - compare the detected voltage (Vcon) to a reference voltage (Vref), and - provide a comparison result which is one of equal to or greater than the reference voltage (Vref) or less than the reference voltage (Vref); and a DC/DC converter (340, 440) comprising a first switching unit (341, 441), a driving voltage adjusting unit (342, 442), a second switching unit (343, 443) and a memory unit configured to store a plurality of driving voltages (Vout), configured to: - select, by the first switching unit, one of the driving voltages according to the comparison result of the power comparing unit (350, 450) and the operative mode of the power amplifier module, and - deliver, by the second switch unit, the selected driving voltage (Vout) to the power amplifier module, so that each of the selected driving voltage (Vout) and the detected voltage (Vcon) rises high as the RF signal output from the power amplifier module moves toward a lower range from a higher range. - select, by the first switching unit, one of the driving voltages according to the comparison result of the power comparing unit (350, 450) and the operative mode of the power amplifier module, and - deliver, by the second switch unit, the selected driving voltage (Vout) to the power amplifier module, so that each of the selected driving voltage (Vout) and the detected voltage (Vcon) rises high as the RF signal output from the power amplifier module moves toward a lower range from a higher range.