Semiconductor integrated circuit with a regulator circuit provided between an input terminal and an output terminal thereof
First Claim
1. A semiconductor integrated circuit comprising:
- an output transistor connected between a first node on an input terminal side and a second node on an output terminal side;
an error amplifier that has a non-inverting input terminal, an inverting input terminal, and an output terminal, the non-inverting input terminal being connected to a third node between the second node and a standard potential, the inverting input terminal being connected to a reference voltage, the output terminal being connected to a gate of the output transistor; and
a control circuit that makes responsiveness of the error amplifier at startup slower than responsiveness of the error amplifier at steady operation,wherein the control circuit compares the voltage on the output terminal and a threshold and controls the responsiveness of the error amplifier according to a comparison result, andwherein if the voltage on the output terminal is less than or equal to the threshold, the control circuit controls the responsiveness of the error amplifier to be at first responsiveness and, if the voltage on the output terminal exceeds the threshold, controls the responsiveness of the error amplifier to be at second responsiveness faster than the first responsiveness.
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Accused Products
Abstract
According to one embodiment, there is provided a semiconductor integrated circuit including an output transistor, an error amplifier, and a control circuit. The output transistor is connected between a first node on an input terminal side and a second node on an output terminal side. The error amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal. The non-inverting input terminal is connected to a third node between the second node and a standard potential. The inverting input terminal is connected to a reference voltage. The output terminal is connected to the gate of the output transistor. The control circuit makes responsiveness of the error amplifier at startup slower than responsiveness of the error amplifier at steady operation.
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Citations
17 Claims
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1. A semiconductor integrated circuit comprising:
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an output transistor connected between a first node on an input terminal side and a second node on an output terminal side; an error amplifier that has a non-inverting input terminal, an inverting input terminal, and an output terminal, the non-inverting input terminal being connected to a third node between the second node and a standard potential, the inverting input terminal being connected to a reference voltage, the output terminal being connected to a gate of the output transistor; and a control circuit that makes responsiveness of the error amplifier at startup slower than responsiveness of the error amplifier at steady operation, wherein the control circuit compares the voltage on the output terminal and a threshold and controls the responsiveness of the error amplifier according to a comparison result, and wherein if the voltage on the output terminal is less than or equal to the threshold, the control circuit controls the responsiveness of the error amplifier to be at first responsiveness and, if the voltage on the output terminal exceeds the threshold, controls the responsiveness of the error amplifier to be at second responsiveness faster than the first responsiveness. - View Dependent Claims (2, 3, 4, 15)
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5. A semiconductor integrated circuit comprising:
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an output circuit connected between a first node on an input terminal side and a second node on an output terminal side, circuit resistance between the first node and the second node being able to be switched; an error amplifier that has a non-inverting input terminal, an inverting input terminal, and an output terminal, the non-inverting input terminal being connected to a third node between the second node and a standard potential, the inverting input terminal being connected to a reference voltage, and the output terminal being connected to the output circuit; and a control circuit that makes circuit resistance of the output circuit at startup higher than circuit resistance of the output circuit at steady operation, wherein the control circuit compares the voltage on the output terminal and a threshold and controls the circuit resistance of the output circuit according to a comparison result, and wherein if the voltage on the output terminal is less than or equal to the threshold, the control circuit controls the circuit resistance of the output circuit to be at a first value and, if the voltage on the output terminal exceeds the threshold, controls the circuit resistance of the output circuit to be at a second value lower than the first value. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16, 17)
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6. A semiconductor integrated circuit comprising:
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an output circuit connected between a first node on an input terminal side and a second node on an output terminal side, circuit resistance between the first node and the second node being able to be switched; an error amplifier that has a non-inverting input terminal, an inverting input terminal, and an output terminal, the non-inverting input terminal being connected to a third node between the second node and a standard potential, the inverting input terminal being connected to a reference voltage, and the output terminal being connected to the output circuit; and a control circuit that makes circuit resistance of the output circuit at startup higher than circuit resistance of the output circuit at steady operation, wherein the output circuit has; an output transistor connected between the first node and the second node; a first resistor connected in series to the output transistor between the first node and the second node; and a first switch connecting opposite ends of the first resistor, and wherein the control circuit compares the voltage on the output terminal and a threshold and controls the on/off of the first switch according to a comparison result. - View Dependent Claims (7, 8)
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Specification