A method achieving high power conversion efficiency of ground-centered charge pumps and reducing output impedance on both outputs by requiring two switching states only hence improving load regulation, wherein both positive (VPOS) and negative (VNEG) output voltages have an equally divided output voltage compared to an input voltage VDD of the charge pump, wherein the equally divided output voltages comprise +/- VDD/2 and +/- VDD/3 voltages, the method comprising the steps of: providing a ground-centered charge pump, a switching network, a port for positive output voltage, a port for negative output voltage, and not more than two flying capacitors (CA, CB); Using only" two switching states of the switching network by suitably arranging the switching network and adapting switching sequences (state 1, state 2) of switches of the switching network; and maintaining constant flying capacitor voltages in all switching states; characterized in that, in step 2 of the method, in order to achieve the positive output voltage = +VDD/3 and the negative output voltage = - VDD/3, in the first switching state (state 1) the switching network switches in a way that the positive output voltage is set to +VDD/3 and the flying capacitor voltage on the first flying capacitor is 2 x VDD/3 and on the second flying capacitor is VDD/3 and where in the second switching state (state 2) the switching network switches in a way that the negative output voltage is set to -VDD/3 and the flying capacitor voltage on the first flying capacitor is 2 x VDD/3 and on the second flying capacitor is VDD/3 and where in the second switching state (state 2) the positive terminal of the first flying capacitor is connected to the port for positive output voltage and the negative terminal of the first flying capacitor is connected to the port for negative output voltage, the positive terminal of the second flying capacitor is connected to ground and the negative terminal of the second flying capacitor is connected to the port for negative output voltage and wherein the input voltage is divided by 2 by the switching network together with two flying capacitors (CA, CB) to achieve the positive output voltage = +VDD/2 and the negative output voltage = -VDD/2. providing a ground-centered charge pump, a switching network, a port for positive output voltage, a port for negative output voltage, and not more than two flying capacitors (CA, CB); Using only" two switching states of the switching network by suitably arranging the switching network and adapting switching sequences (state 1, state 2) of switches of the switching network; and maintaining constant flying capacitor voltages in all switching states; characterized in that, in step 2 of the method, in order to achieve the positive output voltage = +VDD/3 and the negative output voltage = - VDD/3, in the first switching state (state 1) the switching network switches in a way that the positive output voltage is set to +VDD/3 and the flying capacitor voltage on the first flying capacitor is 2 x VDD/3 and on the second flying capacitor is VDD/3 and where in the second switching state (state 2) the switching network switches in a way that the negative output voltage is set to -VDD/3 and the flying capacitor voltage on the first flying capacitor is 2 x VDD/3 and on the second flying capacitor is VDD/3 and where in the second switching state (state 2) the positive terminal of the first flying capacitor is connected to the port for positive output voltage and the negative terminal of the first flying capacitor is connected to the port for negative output voltage, the positive terminal of the second flying capacitor is connected to ground and the negative terminal of the second flying capacitor is connected to the port for negative output voltage and wherein the input voltage is divided by 2 by the switching network together with two flying capacitors (CA, CB) to achieve the positive output voltage = +VDD/2 and the negative output voltage = -VDD/2.