Low-drop voltage regulator
First Claim
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1. A low-drop voltage regulator comprising:
- a power element having an input terminal coupled to a supply voltage source, an output terminal coupled to a load, and a control terminal;
an error comparator having a first input coupled to a reference voltage source, a second input coupled to the output terminal of the power element, and a low-impedance output coupled to the control terminal; and
a feedback network, having a reactance, connected between the low-impedance output and the second input of the error comparator.
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Abstract
A low-drop voltage regulator includes a P-type power transistor having an input terminal connected to a supply source, an output terminal connected to a load, and a control terminal driven by the output of an operational amplifier having its non-inverting input connected to a reference voltage source and its inverting input connected to the output terminal of the power transistor. To improve the regulation characteristics of the regulator without jeopardizing stability, even under normally critical conditions, provision is made for a feedback network including a capacitive component between the output and inverting input of the operational amplifier.
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Citations
43 Claims
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1. A low-drop voltage regulator comprising:
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a power element having an input terminal coupled to a supply voltage source, an output terminal coupled to a load, and a control terminal; an error comparator having a first input coupled to a reference voltage source, a second input coupled to the output terminal of the power element, and a low-impedance output coupled to the control terminal; and a feedback network, having a reactance, connected between the low-impedance output and the second input of the error comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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14. A low-drop voltage regulator comprising:
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modulating means, operative in response to a drive signal, for modulating a flow of current between a voltage supply and an output terminal to generate an output signal; control means for varying the drive signal in proportion to the output signal, said control means including; means for generating a low source-impedance control signal; a drive stage that generates the drive signal in response to the control signal; and coupling means for coupling the drive stage and the means for generating; and a feedback path including a reactance coupled between the output terminal and the coupling means. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A low-drop voltage regulator comprising:
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a power element having an input terminal coupled to a supply voltage source, an output terminal coupled to a load, and a control terminal; an error comparator having at least one reference input coupled to a reference source, at least one feedback input coupled to the output terminal of the power element, and a voltage-source output; and a single drive transistor, coupled between the low-impedance voltage-source output and the control terminal. - View Dependent Claims (24, 25, 26, 27, 28)
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38. A low-drop voltage regulator comprising:
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a power element having an input terminal coupled to a supply voltage source, an output terminal coupled to a load, and a control terminal; an error comparator having a first input coupled to a reference voltage source, a second input coupled to the output terminal, and an output coupled to the control terminal; and a compensation network, including a resistor connected in series with a capacitor, coupled between the output and second input of the error comparator. - View Dependent Claims (39, 40, 41, 42, 43)
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Specification