LDO (low dropout regulator) circuit and LDO implementing method

A circuit and compensation circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as failure to follow, LDO circuit stability decline, etc.
CN107688366AActive Publication Date: 2018-02-13GUANGZHOU HUIZHI MICROELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU HUIZHI MICROELECTRONICS
Publication Date
2018-02-13

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Abstract

The invention discloses an LDO (low dropout regulator) circuit, comprising an LDO main circuit, a detection circuit and a compensation circuit, wherein the LDO main circuit is used for reducing an input voltage according to a reference voltage to obtain a reduced voltage and performing feedback processing to keep the reduced voltage constant so as to obtain an output voltage; the detection circuitis used for acquiring compensation current information based on output current of the LDO main circuit, wherein the compensation current information is used for characterizing changes in the output current; the compensation circuit is used for regulating frequency of a zero point of the LDO main circuit according to the compensation current information so that during operating of the LDO main circuit, the frequency of the zero point is kept matched with that of an extreme point of the LDO main circuit at an output node, and the constant output voltage is maintained. The invention also discloses an LDO implementing method.
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Description

technical field

[0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a low dropout linear regulator (LDO, Low Dropout Regulator) circuit and a method for realizing the LDO. Background technique

[0002] Traditional linear regulators generally require the input voltage to be at least 2V higher than the output voltage, otherwise the linear regulator cannot work properly. However, in some cases, such conditions are relatively harsh. For example, in an application environment where the input voltage is 5V and the output voltage is 3.3V, the voltage difference between the input voltage and the output voltage is only 1.7V. Obviously, the voltage difference of 1.7V It does not meet the working conditions of traditional linear regulators. Therefore, in response to this situation, chip manufacturers have developed LDO-like voltage conversion chips. Moreover, because the LDO has outstanding advantages such as simple structure, lo...

Claims

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