Low-dropout regulator overshoot control
First Claim
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1. A circuit arranged to control a voltage overshoot at a voltage regulator, comprising:
- a power source arranged to produce an offset signal;
a switch arranged to combine the offset signal from the power source to a signal at an input of the voltage regulator in response to an enable signal;
a timing component arranged to send the enable signal to the switch during a start-up of the voltage regulator; and
a voltage regulation loop having a loop gain, a duration for the loop gain to reach a preset threshold being less than a time duration for an output of the voltage regulator to reach a nominal operating voltage.
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Abstract
Representative implementations of devices and techniques control regulator output overshoot. An offset signal is provided to a component of the regulator during at least a portion of the regulator start-up.
12 Citations
22 Claims
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1. A circuit arranged to control a voltage overshoot at a voltage regulator, comprising:
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a power source arranged to produce an offset signal; a switch arranged to combine the offset signal from the power source to a signal at an input of the voltage regulator in response to an enable signal; a timing component arranged to send the enable signal to the switch during a start-up of the voltage regulator; and a voltage regulation loop having a loop gain, a duration for the loop gain to reach a preset threshold being less than a time duration for an output of the voltage regulator to reach a nominal operating voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system, comprising:
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a low drop out voltage regulator, including; an error amplifier having a first input connected to a reference voltage and a second input connected to a feedback voltage, an output of the voltage regulator being based on the reference voltage and the feedback voltage; and a voltage regulation loop coupled to the second input of the error amplifier and arranged to provide the feedback voltage; and an offset circuit arranged to add an offset voltage to the feedback voltage during at least a portion of a start-up of the voltage regulator, wherein a time duration for a loop gain of the voltage regulation loop to reach a preset threshold is less than a time duration for an output of the voltage regulator to reach a nominal operating voltage. - View Dependent Claims (8, 9, 10)
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11. A method of controlling a voltage output of a voltage regulator, comprising:
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charging a voltage regulation loop during a start-up of the voltage regulator; adding an offset to a voltage at the voltage regulation loop during charging of the voltage regulation loop; removing the offset when the voltage regulation loop reaches a preset threshold loop gain; and reducing a time duration for the voltage regulation loop to reach a preset minimum loop gain based on adding the offset to the voltage at the voltage regulation loop. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A low dropout voltage regulator, comprising:
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an error amplifier having at least a first input and a second input; a voltage regulation loop coupled to the first input of the error amplifier; and an offset circuit arranged to provide an offset value to at least one of the first input and the second input of the error amplifier during at least a portion of a start-up of the voltage regulator, wherein the voltage regulation loop includes a loop gain, a duration for the loop gain to reach a preset threshold being less than a time duration for an output of the voltage regulator to reach a nominal operating voltage. - View Dependent Claims (20, 21, 22)
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Specification