Abstract: A power management device is provided that includes a voltage converter, a power point tracker for determining an operational voltage for extracting power and a controller. The device has a sensing device configured for: monitoring an energy harvesting signal, comparing the energy harvesting signal with a first threshold value, and based on the values sometimes generating a trigger signal. The controller performs energy harvesting until a trigger signal is generated by cyclically operating the power point tracker for determining a first and second target voltages performing energy harvesting conditionally based on sensing device signals else operating the voltage converter. The sensing device has a signal output of the first trigger signal and the signal output is electrically connected with a signal input of the power point tracker. The power point tracker is configured for starting a determination of the second target voltage when receiving the first trigger signal.