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US 8,797,008 B2Granted
Low-dropout regulator overshoot control
AssigneeInfineon Technologies AG
InventorSachin Devegowda
Life of this patent
Estimating the term…
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.
Claims22
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.
2 more elements
A system, comprising:
- 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.
4 more elements
A method of controlling a voltage output of a voltage regulator, comprising:
- 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.
2 more elements
A low dropout voltage regulator, comprising:
- 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.
2 more elements
Dependencies are inferred from the claim text.