Series regulator on electronic control unit for automotive vehicle

A series regulator on an electronic control unit for an automotive vehicle which is connected to an in-vehicle power supply for supplying a voltage to a microcomputer, the series regulator comprising:

• a first capacitor that has one end connected to a positive electrode of the in-vehicle power supply and the other end connected to a negative electrode of the in-vehicle power supply;
• a second capacitor that has one end connected to an input terminal of the microcomputer and the other end connected to the negative electrode of the in-vehicle power supply;
• a transistor that has an input terminal connected to the one end of the first capacitor and an output terminal connected to the input terminal of the microcomputer;
• a resistive element that has one end connected to an output control terminal of the transistor;
• a third capacitor that has one end connected to the other end of the resistive element and the other end connected to the negative electrode of the in-vehicle power supply;
• and
• an output control circuit that has an output connected between the output control terminal of the transistor and the resistive element, and controls driving of the transistor, wherein:
• the microcomputer includes a stop processor that stores information required for a subsequent start when a voltage applied between both ends of the first capacitor falls below a given voltage,
• wherein the transistor is a field-effect transistor (FET), and
• the third capacitor is connected in series to agate of the transistor.