A voltage booster circuit (10, 40, 50), having an output terminal, wherein the output terminal is configured to provide an output voltage (V OUT) and a load current (I LOAD) to a high-voltage circuit external and connectable to the voltage booster circuit (10, 40, 50), characterized in that the voltage booster circuit (10, 40, 50) comprises: a first charge pump, configured to be coupled to a first supply voltage and to provide a first bias current and a second bias current; a second charge pump, configured to be coupled to a second supply voltage and to provide the load current (I LOAD): an output voltage fixing circuit, coupled between the first charge pump and the output terminal of the voltage booster circuit (10, 40, 50) and configured to draw the first bias current of a fixed value from the first charge pump to the output terminal of the voltage booster circuit (10, 40, 50); a control circuit, coupled between the output voltage fixing circuit and a load current generation circuit, configured to draw the second bias current of a fixed value from the first charge pump, and to control the load current generation circuit based on the output voltage (V OUT) to adjust a value of the load current (I LOAD), wherein a first charge pump voltage (V PUMP1) of the first charge pump is fixed via the first bias current (IB 1) of the fixed value and the second bias current of the fixed value, so as to further fix the output voltage (V OUT) of the output terminal of the voltage booster circuit (10, 40, 50) based on the fixed first charge pump voltage (V PUMP1); and the load current generation circuit, coupled between the second charge pump and the output terminal of the voltage booster circuit (10, 40, 50) and configured to draw the load current (I LOAD) from the second charge pump to the output terminal of the voltage booster circuit (10, 40, 50). a first charge pump, configured to be coupled to a first supply voltage and to provide a first bias current and a second bias current; a second charge pump, configured to be coupled to a second supply voltage and to provide the load current (I LOAD): an output voltage fixing circuit, coupled between the first charge pump and the output terminal of the voltage booster circuit (10, 40, 50) and configured to draw the first bias current of a fixed value from the first charge pump to the output terminal of the voltage booster circuit (10, 40, 50); a control circuit, coupled between the output voltage fixing circuit and a load current generation circuit, configured to draw the second bias current of a fixed value from the first charge pump, and to control the load current generation circuit based on the output voltage (V OUT) to adjust a value of the load current (I LOAD), wherein a first charge pump voltage (V PUMP1) of the first charge pump is fixed via the first bias current (IB 1) of the fixed value and the second bias current of the fixed value, so as to further fix the output voltage (V OUT) of the output terminal of the voltage booster circuit (10, 40, 50) based on the fixed first charge pump voltage (V PUMP1); and the load current generation circuit, coupled between the second charge pump and the output terminal of the voltage booster circuit (10, 40, 50) and configured to draw the load current (I LOAD) from the second charge pump to the output terminal of the voltage booster circuit (10, 40, 50). an output voltage fixing circuit, coupled between the first charge pump and the output terminal of the voltage booster circuit (10, 40, 50) and configured to draw the first bias current of a fixed value from the first charge pump to the output terminal of the voltage booster circuit (10, 40, 50); a control circuit, coupled between the output voltage fixing circuit and a load current generation circuit, configured to draw the second bias current of a fixed value from the first charge pump, and to control the load current generation circuit based on the output voltage (V OUT) to adjust a value of the load current (I LOAD), wherein a first charge pump voltage (V PUMP1) of the first charge pump is fixed via the first bias current (IB 1) of the fixed value and the second bias current of the fixed value, so as to further fix the output voltage (V OUT) of the output terminal of the voltage booster circuit (10, 40, 50) based on the fixed first charge pump voltage (V PUMP1); and the load current generation circuit, coupled between the second charge pump and the output terminal of the voltage booster circuit (10, 40, 50) and configured to draw the load current (I LOAD) from the second charge pump to the output terminal of the voltage booster circuit (10, 40, 50).