A power management integrated circuit for managing energy from an energy harvester comprising a discontinuous current mode voltage converter configured for receiving an input power (P in) from the energy harvester at an input voltage (V in) and configured for outputting an output power (P out) at an output voltage (V out), and wherein the discontinuous current mode voltage converter is operable for outputting said output power (P out) by generating current pulses wherein each current pulse comprises a charging period wherein an inducing current is increasing until a maximum peak current (I max) and a subsequent de-charging period wherein the inducing current is decreasing, characterized in that said power management integrated circuit comprises • a power control circuit configured for a) monitoring a parameter indicative of said input power (P in), b) comparing said parameter with one or more parameter reference values, and c) selecting a power operational mode from a plurality of power operational modes (PM i) based on said comparison of the parameter with the one or more parameter reference values, and wherein each of the power operational modes (PM i) of said plurality of power operational modes is characterized by a value for said maximum peak current (I max); and • a controller coupled with said power control circuit for receiving the power operational mode selected by the power control circuit, said controller comprises a) a sensing means configured for sensing an actual input voltage and an actual output voltage of respectively said input voltage (V in) and said output voltage (V out) of the discontinuous current mode voltage converter, and b) a processing means configured for generating a first configuration signal (T1 i) and a second configuration signal (T2 i) for operating said discontinuous current mode voltage converter, and wherein said first (T1 i) and second (T2 i) configuration signals are specifying respectively said charging period and said de-charging period, and wherein said generating of the first (T1 i) and second (T2 i) configuration signals is based on said actual input voltage and said actual output voltage and based on the power operational mode selected by the power control circuit, and wherein said controller is coupled with said discontinuous current mode voltage converter for transmitting said first configuration signal (T1 i) and said second configuration signal (T2 i). • a power control circuit configured for a) monitoring a parameter indicative of said input power (P in), b) comparing said parameter with one or more parameter reference values, and c) selecting a power operational mode from a plurality of power operational modes (PM i) based on said comparison of the parameter with the one or more parameter reference values, and wherein each of the power operational modes (PM i) of said plurality of power operational modes is characterized by a value for said maximum peak current (I max); and a) monitoring a parameter indicative of said input power (P in), b) comparing said parameter with one or more parameter reference values, and c) selecting a power operational mode from a plurality of power operational modes (PM i) based on said comparison of the parameter with the one or more parameter reference values, and wherein each of the power operational modes (PM i) of said plurality of power operational modes is characterized by a value for said maximum peak current (I max); and • a controller coupled with said power control circuit for receiving the power operational mode selected by the power control circuit, said controller comprises a) a sensing means configured for sensing an actual input voltage and an actual output voltage of respectively said input voltage (V in) and said output voltage (V out) of the discontinuous current mode voltage converter, and b) a processing means configured for generating a first configuration signal (T1 i) and a second configuration signal (T2 i) for operating said discontinuous current mode voltage converter, and wherein said first (T1 i) and second (T2 i) configuration signals are specifying respectively said charging period and said de-charging period, and wherein said generating of the first (T1 i) and second (T2 i) configuration signals is based on said actual input voltage and said actual output voltage and based on the power operational mode selected by the power control circuit, a) a sensing means configured for sensing an actual input voltage and an actual output voltage of respectively said input voltage (V in) and said output voltage (V out) of the discontinuous current mode voltage converter, and b) a processing means configured for generating a first configuration signal (T1 i) and a second configuration signal (T2 i) for operating said discontinuous current mode voltage converter, and wherein said first (T1 i) and second (T2 i) configuration signals are specifying respectively said charging period and said de-charging period, and wherein said generating of the first (T1 i) and second (T2 i) configuration signals is based on said actual input voltage and said actual output voltage and based on the power operational mode selected by the power control circuit,