A system and a method are disclosed for providing a highly efficient wide bandwidth power supply for a power amplifier. A power supply control circuit of the invention comprises a wide bandwidth low drop out (LDO) circuit and a highly efficient switcher circuit. The switcher circuit comprises a switcher control circuit that receives an I.sub.LDO current signal from the low drop out (LDO) circuit and an I.sub.SWITCHER current signal from the switcher circuit. The switcher control circuit uses the I.sub.LDO value and the I.sub.SWITCHER value to control an amount of current that is provided by the switcher circuit. The I.sub.LDO current from the low drop out (LDO) circuit and the I.sub.SWITCHER current from the switcher circuit are used to control a supply voltage V.sub.CC that is provided to a power amplifier.