LOW DROP OUT VOLTAGE REGULATO
First Claim
1. A low drop out (LDO) voltage regulator, comprising:
- an error amplifier, for generating a control voltage according to a first reference voltage and a feedback voltage;
a power transistor, comprising a gate coupled to the error amplifier and a source coupled to a supply voltage, for generating an output voltage at a drain of the power transistor according to the control voltage;
a first voltage division unit, coupled between the drain of the power transistor and a ground, for dividing the output voltage to generate the feedback voltage;
a compensation control unit, coupled between the gate and the drain of the power transistor, for generating a compensation control signal according to the control voltage, the output voltage, and a compensation bias, wherein the compensation bias is inversely proportional to the supply voltage and ambient temperature; and
a compensation bias current source, coupled to the error amplifier, for supplying a compensation bias current to the LDO voltage regulator according to the compensation control signal.
1 Assignment
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Accused Products
Abstract
A low drop out (LDO) voltage regulator having an error amplifier, a power transistor, a first voltage division unit, a compensation control unit and a compensation bias current source is provided. The error amplifier generates a control voltage according to a first reference voltage and a feedback voltage. The power transistor generates an output voltage at a drain of the power transistor according to the control voltage. The first voltage division unit divides the output voltage to generate the feedback voltage. The compensation control unit generates a compensation control signal to the compensation bias current source according to the control voltage, the output voltage and a compensation bias, so as to make the compensation bias current source generate a compensation bias current, in which the compensation bias is inversely proportional to a supply voltage and ambient temperature.
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Citations
13 Claims
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1. A low drop out (LDO) voltage regulator, comprising:
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an error amplifier, for generating a control voltage according to a first reference voltage and a feedback voltage; a power transistor, comprising a gate coupled to the error amplifier and a source coupled to a supply voltage, for generating an output voltage at a drain of the power transistor according to the control voltage; a first voltage division unit, coupled between the drain of the power transistor and a ground, for dividing the output voltage to generate the feedback voltage; a compensation control unit, coupled between the gate and the drain of the power transistor, for generating a compensation control signal according to the control voltage, the output voltage, and a compensation bias, wherein the compensation bias is inversely proportional to the supply voltage and ambient temperature; and a compensation bias current source, coupled to the error amplifier, for supplying a compensation bias current to the LDO voltage regulator according to the compensation control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification