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US 10,768,646 B2Granted
Low dropout regulating device and operating method thereof
AssigneeMacronix International Co., Ltd.
InventorYih-Shan Yang
Life of this patent
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Abstract
A low dropout (LDO) regulating device includes a regulator and a pre-charger. The regulator is configured to adjust an output voltage provided to an output node in accordance with a voltage difference between a first reference voltage and a feedback voltage on a feedback node, wherein the feedback node is coupled to the output node. The pre-charger is electrically connected to the regulator, and is electrically connected to the feedback node for charge sharing.
Claims18
A low dropout (LDO) regulating device, comprising:
- a regulator, configured to adjust an output voltage provided to an output node in accordance with a voltage difference between a first reference voltage and a feedback voltage on a feedback node, wherein the feedback node is coupled to the output node, and the regulator comprises:
- a comparing circuit, configured to receive the first reference voltage and the feedback voltage, and generate a control voltage on a control node in accordance with the voltage difference between the first reference voltage and the feedback voltage;
- and
- an output transistor including a control terminal coupling to the control node, a first terminal coupling to a supply voltage and a second terminal coupling to the output node, wherein the output transistor responds to the control voltage to generate the output voltage at the second terminal;
- and
- a pre-charger, electrically connected to the regulator, the pre-charger being electrically connected to the feedback node for charge sharing,
- wherein the pre-charger comprises:
- a pre-charge capacitor;
- a pre-charge power supply, configured to provide a second reference voltage;
- and
- a sampling switch, coupled between the pre-charge capacitor and the pre-charge power supply, allowing the pre-charge power supply to charge the pre-charge capacitor.
8 more elements
An operating method of a low dropout (LDO) regulating device, comprising:
- configuring a regulator to adjust an output voltage provided to an output node in accordance with a voltage difference between a first reference voltage and a feedback voltage on a feedback node;
- configuring a pre-charger to electrically disconnect from the feedback node to accumulate charges in an OFF state of the regulator;
- and
- electrically connecting the pre-charger to the feedback node for charge sharing,
- wherein said step of configuring the regulator further comprises:
- configuring a comparing circuit to receive the first reference voltage and the feedback voltage, and generate a control voltage on a control node in accordance with the voltage difference between the first reference voltage and the feedback voltage;
- configuring an output transistor including a control terminal coupling to the control node, a first terminal coupling to a supply voltage and a second terminal coupling to the output node, wherein when the regulator is in an ON state, transferring the supply voltage to the output node via the output transistor;
- and
- configuring a feedback circuit coupled between the output node and the comparing circuit, to provide a voltage division path to form the feedback node, and to provide the feedback voltage on the feedback node to the comparing circuit,
- wherein said step of configuring the pre-charger further comprises:
- configuring a pre-charge power supply to provide a second reference voltage;
- configuring a pre-charge capacitor selectively couples to the pre-charge power supply;
- charging the pre-charge capacitor with the second reference voltage when the regulator is in the OFF state.
10 more elements
Dependencies are inferred from the claim text.