Patent attributes
A voltage generator has a control circuit for controlling a dual-mode charge pump that has multiple control options provided by an optional pull down control signal and an optional stop control signal. The dual-mode charge pump is enabled by a high voltage enable control signal from a control circuit to provide a high-voltage output voltage level Vpp or a low-voltage output voltage level Vdd. A current sink transistor is coupled from the output of the dual-mode charge pump to a ground reference through a current sink control switch transistor that is turned on by the optional pull down control signal. A dual output op amp compares a fixed voltage reference to a voltage proportional to the output voltage of the charge pump. The op amp has a high voltage output signal terminal that turns on the current sink transistor and a low voltage output signal that is coupled to the control circuit.
