Circuit combining a switching regulator and an overvoltage detection circuit
First Claim
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1. An electronic circuit, comprising:
- a switching regulator circuit, comprising;
a first transistor having an input node, an output node, and a control node, wherein the input node of the first transistor is coupled to receive a power supply voltage;
a second transistor having an input node, an output node, and a control node, wherein the input node of the second transistor is coupled to the output node of the first transistor, wherein the output node of the second transistor is coupled to receive a reference voltage; and
a control circuit having a first output node at which a first control signal is provided and a second output node at which a second control signal is provided, wherein the first output node of the control circuit is coupled to the control node of the first transistor, and wherein the second output node of the control circuit is coupled to the control node of the second transistor; and
an overvoltage detection circuit having an input node coupled to receive the power supply voltage and an output node at which an overvoltage signal is provided capable of an overvoltage state indicative of the power supply voltage being above a predetermined threshold voltage, wherein the control circuit is coupled to receive the overvoltage signal, and wherein the control circuit is configured, in response to the overvoltage signal being in the overvoltage state, to generate the first control signal resulting in the first transistor being in an off condition.
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Abstract
An electronic circuit combines a synchronous switching regulator circuit with an overvoltage detection circuit. The overvoltage detection circuit is configured to generate an overvoltage signal capable of an overvoltage state indicative of a power supply voltage being above a predetermined threshold voltage. The switching regulator circuit is coupled to receive the overvoltage signal. The switching regulator is also configured, in response to the overvoltage signal being in the overvoltage state, to generate a first control signal resulting in at least one of two series coupled transistors being in an off condition.
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Citations
20 Claims
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1. An electronic circuit, comprising:
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a switching regulator circuit, comprising; a first transistor having an input node, an output node, and a control node, wherein the input node of the first transistor is coupled to receive a power supply voltage; a second transistor having an input node, an output node, and a control node, wherein the input node of the second transistor is coupled to the output node of the first transistor, wherein the output node of the second transistor is coupled to receive a reference voltage; and a control circuit having a first output node at which a first control signal is provided and a second output node at which a second control signal is provided, wherein the first output node of the control circuit is coupled to the control node of the first transistor, and wherein the second output node of the control circuit is coupled to the control node of the second transistor; and an overvoltage detection circuit having an input node coupled to receive the power supply voltage and an output node at which an overvoltage signal is provided capable of an overvoltage state indicative of the power supply voltage being above a predetermined threshold voltage, wherein the control circuit is coupled to receive the overvoltage signal, and wherein the control circuit is configured, in response to the overvoltage signal being in the overvoltage state, to generate the first control signal resulting in the first transistor being in an off condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of controlling a switching regulator circuit, the switching regulator circuit comprising:
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a first transistor having an input node, an output node, and a control node, wherein the input node of the first transistor is coupled to receive a power supply voltage; a second transistor having an input node, an output node, and a control node, wherein the input node of the second transistor is coupled to the output node of the first transistor, wherein the output node of the second transistor is coupled to receive a reference voltage; and a control circuit having a first output node at which a first control signal is provided and a second output node at which a second control signal is provided, wherein the first output node of the control circuit is coupled to the control node of the first transistor and wherein the second output node of the control circuit is coupled to the control node of the second transistor, the method comprising; detecting if the power supply voltage is above a predetermined threshold voltage; and in response to the detecting, turning off the first transistor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification