: A Direct Current to Direct Current, DC-DC, converter for converting a low-voltage input to a higher-voltage output according to a conversion factor for powering a load such as wireless sensor node, said converter comprising: - a first DC-DC converter circuit arrangement configured to convert said low-voltage input to a first higher-voltage output during a start-up mode of said load; - a second DC-DC converter circuit arrangement configured to convert said low voltage input to a second higher-voltage output during a normal operational mode of said load; - a control circuit for control of said conversion factor; wherein each of said first and second converter circuit arrangement comprises: - an input stage (11, 21, 31) for receiving said low-voltage input; - an intermediate stage (12, 22, 32a, 32b, 32c) in series with said input stage for converting said low-voltage input to said first higher-voltage or said second higher-voltage output circuit at a conversion factor being defined by the ratio between said input and output; - a final stage (13, 23, 33) in series with said intermediate stage for outputting said first higher-voltage or said second higher-voltage output; wherein each of said stages comprises: - a capacitor shared between the stages of said first and second DC/DC converter circuit arrangements and wherein the control circuit and the shared capacitors of all stages together are configured for boosting voltage of said low-voltage input to said first higher-voltage output of said first converter during a start-up and to said second higher-voltage output of said second converter during normal operation, - wherein said first DC-DC converter circuit arrangement comprises a Dickson charge pump layout, and - wherein said second DC-DC converter circuit arrangement comprise a Makowski charge pump layout. - a first DC-DC converter circuit arrangement configured to convert said low-voltage input to a first higher-voltage output during a start-up mode of said load; - a second DC-DC converter circuit arrangement configured to convert said low voltage input to a second higher-voltage output during a normal operational mode of said load; - a control circuit for control of said conversion factor; wherein each of said first and second converter circuit arrangement comprises: - an input stage (11, 21, 31) for receiving said low-voltage input; - an intermediate stage (12, 22, 32a, 32b, 32c) in series with said input stage for converting said low-voltage input to said first higher-voltage or said second higher-voltage output circuit at a conversion factor being defined by the ratio between said input and output; - a final stage (13, 23, 33) in series with said intermediate stage for outputting said first higher-voltage or said second higher-voltage output; wherein each of said stages comprises: - a capacitor shared between the stages of said first and second DC/DC converter circuit arrangements and wherein the control circuit and the shared capacitors of all stages together are configured for boosting voltage of said low-voltage input to said first higher-voltage output of said first converter during a start-up and to said second higher-voltage output of said second converter during normal operation, - wherein said first DC-DC converter circuit arrangement comprises a Dickson charge pump layout, and - wherein said second DC-DC converter circuit arrangement comprise a Makowski charge pump layout. - an input stage (11, 21, 31) for receiving said low-voltage input; - an intermediate stage (12, 22, 32a, 32b, 32c) in series with said input stage for converting said low-voltage input to said first higher-voltage or said second higher-voltage output circuit at a conversion factor being defined by the ratio between said input and output; - a final stage (13, 23, 33) in series with said intermediate stage for outputting said first higher-voltage or said second higher-voltage output; wherein each of said stages comprises: - a capacitor shared between the stages of said first and second DC/DC converter circuit arrangements and wherein the control circuit and the shared capacitors of all stages together are configured for boosting voltage of said low-voltage input to said first higher-voltage output of said first converter during a start-up and to said second higher-voltage output of said second converter during normal operation, - wherein said first DC-DC converter circuit arrangement comprises a Dickson charge pump layout, and - wherein said second DC-DC converter circuit arrangement comprise a Makowski charge pump layout. - a capacitor shared between the stages of said first and second DC/DC converter circuit arrangements and wherein the control circuit and the shared capacitors of all stages together are configured for boosting voltage of said low-voltage input to said first higher-voltage output of said first converter during a start-up and to said second higher-voltage output of said second converter during normal operation, - wherein said first DC-DC converter circuit arrangement comprises a Dickson charge pump layout, and - wherein said second DC-DC converter circuit arrangement comprise a Makowski charge pump layout.