Method of forming a low power dissipation regulator and structure therefor
First Claim
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1. A method of forming a series pass regulator comprising:
- configuring an input of the series pass regulator to receive an input voltage;
configuring the series pass regulator to form an output voltage on an output of the series pass regulator;
coupling a MOS transistor of the series pass regulator in series between the input and the output wherein the MOS transistor receives the input voltage from the input on a drain of the MOS transistor and conducts a current to the output from a source of the MOS transistor; and
configuring an output biasing network to form a gate-to-source voltage that is greater than a gate-to-source saturation voltage of the MOS transistor for conditions of the input voltage that are less than a threshold voltage of the series pass regulator.
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Abstract
In one embodiment, a method of forming a conditioning circuit includes configuring an output biasing network to provide a biasing voltage to an MOS transistor to enable the MOS transistor to operate in a saturated operating mode for input voltages that are less than a threshold voltage.
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Citations
20 Claims
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1. A method of forming a series pass regulator comprising:
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configuring an input of the series pass regulator to receive an input voltage;
configuring the series pass regulator to form an output voltage on an output of the series pass regulator;coupling a MOS transistor of the series pass regulator in series between the input and the output wherein the MOS transistor receives the input voltage from the input on a drain of the MOS transistor and conducts a current to the output from a source of the MOS transistor; and configuring an output biasing network to form a gate-to-source voltage that is greater than a gate-to-source saturation voltage of the MOS transistor for conditions of the input voltage that are less than a threshold voltage of the series pass regulator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A conditioning circuit for a power supply controller comprising:
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a MOS transistor having a gate, a drain coupled to receive an input voltage, and a source coupled to form an output voltage; a threshold detection circuit coupled to the gate of the MOS transistor, the threshold detection circuit having a threshold voltage; and an output bias network coupled to the gate of the MOS transistor, the output bias network configured to receive the output voltage and provide a bias voltage to the gate of the MOS transistor for input voltages that are less than the threshold voltage. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of forming a conditioning circuit comprising:
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coupling an MOS transistor in series between an input and an output of the conditioning circuit wherein the MOS transistor receives an input voltage from the input on a drain of the MOS transistor and forms an output voltage on a source of the MOS transistor; configuring a threshold circuit with a threshold voltage and configuring the threshold circuit to cause the MOS transistor to operate in a linear operating mode for input voltages that are greater than the threshold voltage; and configuring an output biasing network to provide a biasing voltage to the MOS transistor to enable the MOS transistor to operate in a saturated operating mode for input voltages that are less than the threshold voltage. - View Dependent Claims (18, 19, 20)
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Specification