METHOD OF INTERNAL VOLTAGE GENERATION CONVERTIBLE FROM PUMPING CAPACITY TO CHARGE STORAGE CAPACITY

摘要

PURPOSE: A method of internal voltage generation convertible from pumping capacity to charge storage capacity is provided to supply stable internal voltage with increased charge storage capacity by converting pumping capacity to charge storage capacity when a pumping capacitor is not used for charge pumping. CONSTITUTION: A method of internal voltage generation convertible from pumping capacity to charge storage capacity includes the followings. A comparator compares reference voltage(Vof) and internal voltage(Vo). A controller receives the output signals(OSCEN) of the comparator and generates pumping capacitor operation signal(OSC), charge storage capacitor operation signal(OSC2) and free charge voltage authorization signal(PH1). A pumping capacitor(CP) receives authorization of the pumping capacitor operation signal(OSC). The primary NMOS transistor(SW1) connects the pumping capacitor(CP) and a charge storage capacitor(Cr) by the charge storage capacitor operation signal(OSC2).