Electronic device worn on the body, hearing aid instrument, and voltage supply for such a device

A voltage supply for an electronic device to be worn on the body of a user, the voltage supply comprising:

• a charge pump for converting a battery voltage by a conversion factor to an intermediate voltage, said charge pump being configured for changing over between at least two stages of the conversion factor;
• a voltage regulator for reducing the intermediate voltage to an output voltage of a predefined setpoint value;
• and
• a controller for reversibly changing over said charge pump between the at least two stages of the conversion factor, said controller being configured to actuate said charge pump in accordance with a manipulated variable of said voltage regulator
• said charge pump being configured to be changed over between a first stage with a lower value of the conversion factor and a second stage with a higher value of the conversion factor;
• said controller being configured to set the second stage of the conversion factor if the manipulated variable of said voltage regulator exceeds a first, higher reference value, and to set the first stage of the conversion factor if the manipulated variable of the voltage regulator falls below a second, lower reference value.