Low Dropout Linear Regulators
A low-dropout linear and voltage regulator technology, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, can solve problems such as reducing the stability of the LDO circuit loop, limiting the output voltage of the LDO circuit, and failing to output the LDO circuit. Achieve high degree of freedom, reduce output impedance, and improve precision
Active Publication Date: 2020-11-27
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology
[0003] The inventors have found that there are at least the following problems in the prior art: the output voltage of an existing conventional low-power consumption voltage follower (flipped voltage follower, FVF) structure LDO circuit is greatly affected by the process and temperature, and the LDO When the load capacitance at the output of the circuit changes in a large range, it will reduce the loop stability of the LDO circuit
In addition, if a conventional low-power LDO circuit is used, although it can solve the stability problem caused by large changes in load capacitance, the LDO circuit cannot output a voltage close to the power supply voltage, and the output voltage of the LDO circuit is limited.
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[0016] In order to make the object, technical solution and advantages of the present invention clearer, some embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0017] The first embodiment of the present application relates to a low-dropout linear regulator, which is used to provide an output voltage independent of power supply and ambient temperature, has a certain load capacity, and can be connected with an external capacitor. In this example, please refer to figure 1 , the low-dropout linear regulator includes an operational amplifier A1, a source follower M2, a power adjustment transistor M4, a common-gate amplifier M3, a pull-up transistor M5, and a tail current source M1; wherein, VBP is the bias voltage of the pull-up transistor ...
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Abstract
A low-dropout linear voltage regulator, comprising: an operational amplifier (A1), a source follower (M2), a power regulator tube (M4), a common-gate amplifier (M3), a pull-up tube (M5), and a tail current source (M1); a source electrode of the source follower (M2) is connected to a drain electrode of the power regulator tube (M4) and a reversed phase input end of the operational amplifier (A1), while a drain electrode of the source follower (M2) is grounded by means of the tail current source (M1), and a gate electrode of the source follower (M2) is connected to an output end of the operational amplifier (A1); a drain electrode of the common-gate amplifier (M3) is connected to a drain electrode of the pull-up tube (M5) and a gate electrode of the power regulator tube (M4), while a source electrode of the common-gate amplifier (M3) is grounded by means of the tail current source (M1); a source electrode of the power regulator tube (M4) and a source electrode of the pull-up tube (M5) are both connected to a voltage source; a positive phase input end of the operational amplifier (A1) is used for inputting a reference voltage, and the source electrode of the source follower (M2) is used for outputting a regulating voltage. By using the low-dropout linear voltage regulator, a high-accuracy output voltage may be obtained, and the output voltage has a high degree of freedom.
Description
technical field [0001] The present application relates to the technical field of circuit design, in particular to a low-dropout linear voltage regulator. Background technique [0002] A low dropout regulator (LDO for short) can provide an output voltage independent of power supply and ambient temperature, has a certain load capacity, and has been widely used in various power chips. Compared with traditional linear regulators, LDOs allow a smaller voltage difference between the input and output; for example, the LDO input voltage can be only 1.7V higher than the output voltage, or less. [0003] The inventors have found that there are at least the following problems in the prior art: the output voltage of an existing conventional low-power consumption voltage follower (flipped voltage follower, FVF) structure LDO circuit is greatly affected by the process and temperature, and the LDO When the load capacitance at the output of the circuit changes in a large range, it will red...
Claims
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Login to View More IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 李经珊陈科詹昶
Owner SHENZHEN GOODIX TECH CO LTD