Ldo output power-on glitch removal circuit
AssigneeSkyworks Solutions, Inc.
InventorsLynn Yun Kong, Yi Yang, Bo Zhou
Life of this patent
Estimating the term…
Abstract
A voltage regulator circuit for supplying a voltage to an input of a subsequent circuit element, the voltage regulator circuit comprising: a power supply, an output adapted to deliver a regulated output voltage, a first transistor connected between the power supply and the output for controlling the output voltage, a differential amplifier configured to provide a feedback to the first transistor, a protective circuit which is coupled to the gate of the first transistor and configured to control the first transistor, such that the turn-on of the first transistor is delayed and any overshoot output voltage is avoided at the output during an initial charging up phase after the power supply is turned on.
Claims21
(canceled)
A voltage regulator circuit for supplying a voltage to an input of a subsequent circuit element, the voltage regulator circuit comprising:
- a first transistor connected between a power supply and an output of the voltage regulator circuit;
- and
- a protective circuit which is coupled through a second transistor to the first transistor and is configured to control the first transistor, such that a turn-on of the first transistor is delayed and an overshoot output voltage is prevented at the output during an initial charging up phase after the power supply is turned on, the second transistor connected between the power supply and the first transistor, the protective circuit configured, through a third transistor, to turn on the second transistor, the third transistor coupled between a bandgap voltage reference circuit and a control input of the second transistor.
An electronic device comprising:
- a power supply;
- a voltage regulator circuit;
- and
- a subsequent circuit having an input and configured to receive a voltage at the input from the voltage regulator circuit, the voltage regulator circuit including:
- a first transistor connected between the power supply and an output of the voltage regulator circuit, and a protective circuit which is connected via a second transistor to the first transistor and is configured to control the first transistor, such that a turn-on of the first transistor is delayed and an overshoot output voltage is prevented at the output during an initial charging up phase after the power supply is turned on, the second transistor connected between the power supply and the first transistor, the protective circuit configured, through a third transistor, to turn on the second transistor, the third transistor coupled between a bandgap voltage reference circuit and a control input of the second transistor.
Dependencies are inferred from the claim text.