Adaptive LDO regulator system and method
First Claim
Patent Images
1. An adaptive low dropout voltage regulator circuit having low power dissipation, including:
- (a) a pass transistor having a control gate, a voltage input, and a voltage output; and
(b) an adaptive control circuit, electrically coupled to the control gate of the pass transistor, the voltage input, and the voltage output, for determining a difference Δ
V between the voltage input to the pass transistor and the voltage output of the pass transistor, and causing an error signal to be applied to the control gate of the pass transistor to keep Δ
V essentially constant as the voltage input varies, wherein the adaptive control circuit includes;
(a) at least one analog to digital converter for digitizing the value of the voltage input and the voltage output;
(b) a signal processor, coupled to the at least one analog to digital converter, for computing Δ
V; and
(c) a digital to analog converter, coupled to the signal processor, for converting Δ
V to the error signal.
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Abstract
An adaptive low dropout voltage regulator (LDO) circuit having low power dissipation, and a method of regulating voltage while maintaining low power dissipation. Power dissipation in an LDO circuit is controlled and held to a low value using an LDO circuit that maintains a constant voltage difference between Vin and Vout; that is, ΔV=Vin−Vout is approximately constant rather than linearly variable as a function of Vin. The output voltage Vout essentially tracks the input voltage Vin with an offset equal to ΔV; Vout increases as Vin, but is kept between minimum and maximum voltage output specification limits.
4 Citations
11 Claims
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1. An adaptive low dropout voltage regulator circuit having low power dissipation, including:
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(a) a pass transistor having a control gate, a voltage input, and a voltage output; and (b) an adaptive control circuit, electrically coupled to the control gate of the pass transistor, the voltage input, and the voltage output, for determining a difference Δ
V between the voltage input to the pass transistor and the voltage output of the pass transistor, and causing an error signal to be applied to the control gate of the pass transistor to keep Δ
V essentially constant as the voltage input varies, wherein the adaptive control circuit includes;(a) at least one analog to digital converter for digitizing the value of the voltage input and the voltage output; (b) a signal processor, coupled to the at least one analog to digital converter, for computing Δ
V; and(c) a digital to analog converter, coupled to the signal processor, for converting Δ
V to the error signal. - View Dependent Claims (2)
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3. An adaptive low dropout voltage regulator circuit having low power dissipation, including:
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(a) means for determining a difference Δ
V between a voltage input to a pass transistor and a voltage output of the pass transistor; and(b) means for controlling the power dissipation of the pass transistor as a function of Δ
V so as to maintain such power dissipation approximately constant as the voltage input varies, wherein the adaptive control circuit includes;(a) at least one analog to digital converter for digitizing the value of the voltage input and the voltage output; (b) a signal processor, coupled to the at least one analog to digital converter, for computing Δ
V; and(c) a digital to analog converter, coupled to the signal processor, for converting Δ
V to the error signal. - View Dependent Claims (4, 5)
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6. A method of regulating voltage with an adaptive low dropout voltage regulator circuit having a pass transistor while maintaining low power dissipation in the pass transistor, including:
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(a) determining a difference Δ
V between a voltage input to the pass transistor and a voltage output of the pass transistor utilizing an adaptive control circuit coupled to a control gate of the pass transistor; and(b) controlling the power dissipation of the pass transistor as a function of Δ
V utilizing the adaptive control circuit by applying an error signal to the control gate of the pass transistor so as to maintain such power dissipation approximately constant as the voltage input varies, wherein the adaptive control circuit includes;(a) at least one analog to digital converter for digitizing the value of the voltage input and the voltage output; (b) a signal processor, coupled to the at least one analog to digital converter, for computing Δ
V; and(c) a digital to analog converter, coupled to the signal processor, for converting Δ
V to the error signal. - View Dependent Claims (7, 8, 9)
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10. A method of regulating voltage in an adaptive low dropout voltage regulator circuit while maintaining low power dissipation, including:
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(a) providing a pass transistor having a control gate, a voltage input, and a voltage output; (b) providing adaptive control circuitry, electrically coupled to the control gate of the pass transistor, the voltage input, and the voltage output, for determining a difference Δ
V between the voltage input to the pass transistor and the voltage output of the pass transistor; and(c) applying an error signal derived from the adaptive control circuitry to the control gate of the pass transistor to keep Δ
V essentially constant as the voltage input varies, wherein the adaptive control circuitry includes;(a) at least one analog to digital converter for digitizing the value of the voltage input and the voltage output; (b) a signal processor, coupled to the at least one analog to digital converter, for computing Δ
V; and(c) a digital to analog converter, coupled to the signal processor, for converting Δ
V to the error signal. - View Dependent Claims (11)
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Specification