BOOSTED VOLTAGE GENERATING CIRCUIT INCLUDING A BOOSTED VOLTAGE PUMP CIRCUIT OPERATED BY AN EXTERNAL SUPPLY VOLTAGE ACCORDING TO THE REFERENCE LEVEL OF A BOOSTED VOLTAGE, AND A BOOSTED VOLTAGE GENERATING METHOD THEREOF

摘要

PURPOSE: A boosted voltage generating circuit and a boosted voltage generating method thereof are provided to prevent a VPP pumping fail by including a boosted voltage pump circuit which is operated when a boosted voltage is less than a reference level.;CONSTITUTION: A first boosted voltage pump circuit(130) is operated by a reference level of a boosted voltage and an external supply voltage. A second boosted voltage pump circuit is operated by only the external supply voltage when a boosted voltage is less than the reference level. A low level detector(140) generates a detection signal by detecting a boosted voltage which is less than a reference level. The boosted voltage generating circuit consumes the electric charge comprising the reference level of the boosted voltage. The second boosted voltage pump circuit(150) offers the reference level of the boosted voltage to the first boosted voltage pump circuit.;COPYRIGHT KIPO 2010