Dual-output direct current voltage converter
First Claim
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1. A dual-output direct current (DC) voltage converter for converting an input DC voltage to at least two different output DC voltages, comprising:
- an input terminal for receiving the input DC voltage from a power voltage source;
a step-down voltage regulator circuit connected to the input terminal for providing a regulated output DC voltage lower than the input DC voltage; and
a charge pump circuit connected to the input terminal and coupled to the step-down voltage regulator circuit, for providing an auxiliary output DC voltage higher than the input DC voltage;
wherein the step-down voltage regulator circuit includes first and second switches coupled in series between the input terminal and a ground potential, and an output filter connected at a junction between the first and second switches; and
the charge pump circuit is further coupled to the step-down voltage regulator circuit at the junction between the first and second switches of the step-down voltage regulator circuit.
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Abstract
A step-down switching voltage regulator with a push-pull output stage is adapted to provide a voltage converter with an auxiliary voltage rail that supplies an auxiliary voltage that is higher than the input supply voltage. The push-pull output stage of the step-down voltage regulator is used to drive a charge pump voltage-doubler circuit. In this way, a single integrated topology provides a regulated low voltage output as well as an auxiliary high voltage output. The circuit topology enables a low component count resulting in lower component cost and smaller physical size.
82 Citations
16 Claims
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1. A dual-output direct current (DC) voltage converter for converting an input DC voltage to at least two different output DC voltages, comprising:
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an input terminal for receiving the input DC voltage from a power voltage source;
a step-down voltage regulator circuit connected to the input terminal for providing a regulated output DC voltage lower than the input DC voltage; and
a charge pump circuit connected to the input terminal and coupled to the step-down voltage regulator circuit, for providing an auxiliary output DC voltage higher than the input DC voltage;
wherein the step-down voltage regulator circuit includes first and second switches coupled in series between the input terminal and a ground potential, and an output filter connected at a junction between the first and second switches; and
the charge pump circuit is further coupled to the step-down voltage regulator circuit at the junction between the first and second switches of the step-down voltage regulator circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A dual-output DC voltage converter for converting an input DC voltage to at least two different DC output voltages, comprising:
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an input terminal for receiving the input DC voltage from a power voltage source;
a step-down voltage regulator circuit that includes controlled switches connected in series between the input terminal and a ground potential;
an output filter connected between a low-voltage output terminal and a junction between the switches; and
a multi-stage charge pump circuit connected to the input terminal and coupled to the junction between the switches, for providing an auxiliary output DC voltage higher than the input DC voltage. - View Dependent Claims (14, 15, 16)
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Specification