Semiconductor integrated circuit device

A semiconductor integrated circuit device comprising:

• a differential amplification circuit having a non-inverting input terminal and an inverting input terminal, the non-inverting input terminal being input with a reference voltage and the inverting input terminal being connected to an output load;
• and
• an output circuit comprising a first MOS transistor having a gate connected to an output terminal of the differential amplification circuit, a source, and a drain connected to the inverting input terminal of the differential amplification circuit such that the first MOS transistor is ON in an operation state and OFF in a non-operation state, and a second MOS transistor connected in series between a power source and the source of the first MOS transistor, with a gate width/gate length ratio of the second MOS transistor smaller than a gate width/gate length ratio of the first MOS transistor, such that the second MOS transistor is ON in the operation state and OFF in the non-operation state.