Are you working with DC current? Implement this LTC1261LCMS8-4#PBF charge pump voltage doubler from Linear Technology in order to have different voltages generated. Its output produces a current of 20(Max) mA. With an output that has a voltage of -4 V, this is power management at its best. This device has a minimum operating supply voltage of 4.35 V and a maximum of 5.25 V. This inverting charge pump has a minimum operating temperature of 0 °C and a maximum of 70 °C.
