ACTIVE INTERNAL VOLTAGE GENERATING CIRCUIT

摘要

PURPOSE: An active internal voltage generating circuit is provided to prevent overshooting of internal voltage by making gate-to-source voltage of a driving transistor maintained constantly irrespective of variation of external voltage. CONSTITUTION: A comparator(10) compares internal voltage(VINTA) with reference voltage(VREFA) in response to a control signal(PVINTAEB), and outputs a drive control signal(VINTAEB) as a comparison result. A driving transistor(20) supplies external voltage to an internal voltage output node in response to the drive control signal. A pull-down circuit(32) is connected between an output node of the comparator and ground voltage, and holds the drive control signal of a low level in response to a control signal and the internal voltage. A clamping circuit(40) is connected between the output node of the comparator and the external power supply(EVCC), and makes a level of the drive control signal follow an external power supply voltage level when the external power supply voltage is higher than a predetermined voltage.