A wireless industrial process field device for use in controlling or monitoring a process variable of an industrial process, comprising: a process device circuitry with a process interface circuit configured to measure or control the process variable of the industrial process with a process interface element; a wireless communication circuitry configured for wireless communication; a power storage element having a voltage output; and a power supply circuitry configured to provide power to the process device circuitry from the power storage element at an output voltage, the power supply circuitry comprising: a low drop out voltage regulator configured to reduce a voltage of the power storage element when the voltage output of the power storage element is above a threshold, and provide the reduced voltage to the process device circuitry; a boost converter configured to increase the voltage of the power storage element when the voltage output of the power storage element is below the threshold, and provide the increased voltage to the process device circuitry; characterized by the power supply circuitry comprising: a comparator configured to turn the boost converter off if the voltage output from the power storage element is greater than the threshold; and an analog switch responsive to an output from the comparator to connect an output of the low drop out voltage regulator to the process device circuitry if the voltage output from the power storage element is greater than the threshold and further configured to connect an output of the boost converter to the process device circuitry if the voltage output from the power storage element is less than the threshold. a process device circuitry with a process interface circuit configured to measure or control the process variable of the industrial process with a process interface element; a wireless communication circuitry configured for wireless communication; a power storage element having a voltage output; and a power supply circuitry configured to provide power to the process device circuitry from the power storage element at an output voltage, the power supply circuitry comprising: a low drop out voltage regulator configured to reduce a voltage of the power storage element when the voltage output of the power storage element is above a threshold, and provide the reduced voltage to the process device circuitry; a boost converter configured to increase the voltage of the power storage element when the voltage output of the power storage element is below the threshold, and provide the increased voltage to the process device circuitry; a low drop out voltage regulator configured to reduce a voltage of the power storage element when the voltage output of the power storage element is above a threshold, and provide the reduced voltage to the process device circuitry; a boost converter configured to increase the voltage of the power storage element when the voltage output of the power storage element is below the threshold, and provide the increased voltage to the process device circuitry; a comparator configured to turn the boost converter off if the voltage output from the power storage element is greater than the threshold; and an analog switch responsive to an output from the comparator to connect an output of the low drop out voltage regulator to the process device circuitry if the voltage output from the power storage element is greater than the threshold and further configured to connect an output of the boost converter to the process device circuitry if the voltage output from the power storage element is less than the threshold.