Abstract: A system and a method is disclosed for allowing bandgap circuitry to function on a low supply voltage integrated circuit, and for using the reference voltage (Vbg) generated by the bandgap circuitry to enable a reference voltage to control system voltage. An illustrative embodiment comprises a charge pump to raise a supply voltage to a system voltage, and an open loop controller, which provides a first signal to activate the charge pump, enabling a bandgap circuit, which outputs a bandgap voltage reference. Further, the system comprises a closed loop controller, which regulates the system voltage by comparing the system voltage to the bandgap reference voltage. Upon the system voltage falling below a target voltage, the closed loop controller provides a second signal to activate the charge pump. Additionally the system comprises a switch controller, which selects the closed loop controller upon sensing the bandgap circuit is active.