DYNAMIC CURRENT SINK FOR STABILIZING LOW DROPOUT LINEAR REGULATOR
First Claim
1. A dynamic current sink for stabilizing an output voltage at an output node of an LDO (Low Dropout Linear Regulator), comprising:
- a comparator, for comparing a first reference signal with a signal obtained from the LDO to generate a comparison result, wherein the comparison result indicates whether an overshoot output voltage related to the LDO occurs;
a control circuit, coupled to the comparator, for generating a first control signal according to the comparison result; and
a first transistor, coupled to the output node of the LDO, a reference voltage and the first control signal, for selectively connecting or disconnecting the output node of the LDO to the reference voltage according to the first control signal.
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Abstract
A dynamic current sink includes the following elements. A voltage comparator compares a reference voltage with a second control signal from an LDO (Low Dropout Linear Regulator) to generate a first control signal. A first transistor selectively pulls down a voltage at a first node according to the first control signal. The inverter is coupled between the first node and a second node. An NAND gate has a first input terminal coupled to a second transistor and a third node, a second input terminal coupled to the second node, and an output terminal coupled to a fourth node. A capacitor is coupled between the fourth node and a fifth node. A resistor is coupled between the fifth node and a ground voltage. A third transistor has a control terminal coupled to the fifth node, and selectively draws a discharge current from an output node of the LDO.
30 Citations
20 Claims
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1. A dynamic current sink for stabilizing an output voltage at an output node of an LDO (Low Dropout Linear Regulator), comprising:
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a comparator, for comparing a first reference signal with a signal obtained from the LDO to generate a comparison result, wherein the comparison result indicates whether an overshoot output voltage related to the LDO occurs; a control circuit, coupled to the comparator, for generating a first control signal according to the comparison result; and a first transistor, coupled to the output node of the LDO, a reference voltage and the first control signal, for selectively connecting or disconnecting the output node of the LDO to the reference voltage according to the first control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An LDO (Low Dropout Linear Regulator), comprising:
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a first comparator, for comparing a feedback voltage with a first reference signal to generate a first control signal; a first transistor, coupled to a supply voltage, an output node of the LDO and the first control signal, for selectively connecting or disconnecting the supply voltage to the output node of the LDO; a dynamic current sink, coupled to the output node of the LDO, for determining whether an overshoot output voltage relates to the LDO occurs to selectively provide a discharge current to the output node of the LDO. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification