Internal voltage generation circuit that down-converts external power supply voltage and semiconductor device generating internal power supply voltage on the basis of reference voltage

摘要

An internal voltage-down power supply circuit includes a voltage-down circuit, a comparator circuit (current mirror amplifier), and a current source control circuit. The comparator circuit (current mirror amplifier) includes a current source (NMOS). When an external power supply voltage is increased, the current source control circuit reduces a control voltage applied to the gate of the current source to reduce the current from the current source. When the temperature becomes lower, the current source control circuit reduces the control voltage applied to the gate of the current source to reduce the current from the current source. Therefore, the closed loop gain of the internal voltage-down power supply circuit can be suppressed from increasing, and unnecessary oscillation of the internal power supply voltage can be prevented even when the external power supply voltage is increased and the temperature during operation is low.