Patent ID: 7786713

Claim:
A series regulator circuit comprising: a first transistor connected to a constant current source, which is connected to an input voltage line, and a reference voltage line; a second transistor connected to the input voltage line and an output terminal; a first switch element connected to the input voltage line; a third transistor connected to the first switch element and the output terminal; a first resistor and a second resistor connected in series between the output terminal and the reference voltage line; a third resistor connected to the output terminal; and a second switch element connected to the third resistor and the reference voltage line; wherein the first transistor includes a control terminal connected between the first resistor and the second resistor; the second transistor and the third transistor each include a control terminal connected between the constant current source and the first transistor; and when in a high current mode in which current consumption at the output terminal is high, the first switch element is activated to supply current via the third transistor, and the second switch element is activated so that current flows through the third resistor.