Low-dropout voltage regulator with a voltage slew rate efficient transient response boost circuit
First Claim
1. A voltage regulator for generating an output voltage comprising:
- (a) an amplifier having an amplifier output;
(b) a pass device having a first node which is coupled to the amplifier output, the pass device generating the output voltage via a second node of the pass device; and
(c) a voltage control circuit which applies a voltage to the first node of the pass device to accelerate the response time of the amplifier in enabling the voltage regulator to reach its final regulated output voltage.
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Accused Products
Abstract
A low-dropout (LDO) voltage regulator for generating an output voltage is disclosed. The voltage regulator includes a startup circuit, a curvature corrected bandgap circuit, an error amplifier, a metal oxide semiconductor (MOS) pass device and a voltage slew rate efficient transient response boost circuit. The MOS pass device has a gate node which is coupled to the output of the error amplifier, and a drain node for generating the output voltage. The voltage slew rate efficient transient response boost circuit applies a voltage to the gate node of the MOS pass device to accelerate the response time of the error amplifier in enabling the LDO voltage regulator to reach its final regulated output voltage when an output voltage drop occurs in the LDO voltage regulator.
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Citations
20 Claims
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1. A voltage regulator for generating an output voltage comprising:
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(a) an amplifier having an amplifier output; (b) a pass device having a first node which is coupled to the amplifier output, the pass device generating the output voltage via a second node of the pass device; and (c) a voltage control circuit which applies a voltage to the first node of the pass device to accelerate the response time of the amplifier in enabling the voltage regulator to reach its final regulated output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A voltage regulator for generating an output voltage comprising:
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(a) a pass device having an output node for generating the output voltage of the voltage regulator; (b) an amplifier having an amplifier output coupled to an input node of the pass device; and (c) a voltage control circuit coupled to the amplifier output of the amplifier and the input node of the pass device, wherein the voltage control circuit is configured to apply a voltage to the input node of the pass device to accelerate the response time of the amplifier in enabling the voltage regulator to reach its final regulated output voltage. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of regulating an output voltage comprising:
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(a) generating a first control signal to adjust the output voltage to a full load regulated value; (b) generating a transient response boost voltage; and (c) selectively applying the transient response boost voltage to the first control signal to accelerate the rate at which the output voltage is adjusted to the full load regulated value. - View Dependent Claims (18, 19, 20)
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Specification