Patent ID: 7345932

Claim:
A voltage generator circuit comprising: a source transistor coupled between an integrated circuit substrate voltage Vbb and an output node, wherein the source transistor is selectively activated to couple the output node to the voltage Vbb to regulate an output voltage; a reference voltage circuit providing first and second reference voltages, where the first reference voltage Vref 1 is less than the second reference voltage Vref 2 ; a control circuit coupled to the source transistor to maintain the output voltage at approximately Vref 1 -Vref 2 ; and wherein the reference voltage circuit comprises a hysteresis circuit to selectively increase the second reference voltage to a third reference voltage Vref 3 such that the output voltage is selectively regulated in a range of about Vref 1 -Vref 2 to Vref 1 -Vref 3 .