REGULATOR CIRCUIT

To provide a regulator circuit which protects over-current while reducing the increase of power consumption and circuit scale.SOLUTION: A regulator circuit 200 includes: an operational amplifier OP1 which generates a difference voltage VQ indicating a difference between a feedback voltage VF resulting from dividing an output voltage VOUT and a reference voltage VREF; a first current path HV_MN0 and MN3 which causes a first current I1 corresponding to the difference voltage to flow; a current mirror circuit which is connected to the first current path and sends a current obtained by copying the first current to an output terminal t3 as an output current Iout; and an over-current protection circuit 202 which limits a current value of the output current to a prescribed value or lower. The over-current protection circuit includes a first transistor MN1 which is connected to the first current path and receives a current Ilimit corresponding to the prescribed value as an upper limit current by a gate thereof and causes the first current to flow between a source thereof and a drain thereof.SELECTED DRAWING: Figure 3 【課題】消費電力及び回路規模の増大を抑えて、過電流保護を行うレギュレータ回路を提供する。【解決手段】レギュレータ回路２００は、出力電圧ＶＯＵＴを分圧した帰還電圧ＶＦと基準電圧ＶＲＥＦとの差分を表す差分電圧ＶＱを生成するオペアンプＯＰ１と、差分電圧に対応した第１の電流Ｉ１を流す第１の電流路ＨＶ＿ＭＮ０、ＭＮ３と、第１の電流路に接続されており、第１の電流をコピーした電流を出力電流Ｉｏｕｔとして出力端子ｔ３に送出するカレントミラー回路と、出力電流の電流値を所定の所定値以下に制限する過電流保護回路２０２と、を含む。過電流保護回路は、第１の電流路に接続されており、所定値に対応した電流Ｉｌｉｍｉｔを上限電流として自身のゲートで受けると共に第１の電流を自身のソースドレイン間に流す第１のトランジスタＭＮ１を含む。【選択図】図３