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Low dropout linear regulator circuit

A low-dropout linear, voltage-stabilizer technology, applied in instruments, adjusting electrical variables, control/regulating systems, etc., can solve the problems of inability to compensate for circuits, high cost of external capacitors, and easy oscillation, to increase the damping factor, avoid Gain Spikes, Effect of Guaranteed Gain Performance

Active Publication Date: 2022-03-22
JLQ TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. The disadvantage of the second compensation technology is that the stability of the circuit needs to rely on external capacitors, which has great limitations on the application of the circuit.
And in order to stabilize the circuit, a large external capacitor is required. The NMOS LDO with a maximum load of 500mA requires an external capacitor of 4.7μF-10μF, and the cost of a large external capacitor increases
When the load range is large, the circuit cannot compensate and is prone to oscillation

Method used

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Embodiment Construction

[0030] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0032] The relative arrangement of components, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. In all examples shown and discussed herein, any specific values ​​should be construed as illustrative only, and not as limiting. Therefore, other examples of the exemplary embodiment may have different values.

[0033] In addition...

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Abstract

The present invention provides a low-dropout linear voltage regulator circuit, comprising: a first power transistor with a first source, a first drain and a first gate, the first drain is connected to a voltage input terminal, the The first source is connected to the voltage output terminal; the multi-stage amplifier has a first-stage amplifier and a second-stage amplifier, the second-stage amplifier is the rear stage of the first-stage amplifier, and the output end of the second-stage amplifier connected to the first gate; the voltage stabilization compensation module includes a first compensation capacitor and a second compensation capacitor, the first end of the first compensation capacitor is connected to the first node of the first stage amplifier, the The second end of the first compensation capacitor is connected to the first gate, the first end of the second compensation capacitor is connected to the first node of the first-stage amplifier, and the second end of the second compensation capacitor connected to the first source.

Description

technical field [0001] The invention mainly relates to the field of integrated circuits, in particular to a low-dropout linear regulator circuit. Background technique [0002] During the working process of electronic equipment, when the AC mains is rectified or powered by an AC adapter, or powered by a battery pack, the power supply voltage will vary within a wide range. For example, the voltage variation range between the voltage of a single lithium battery when it is fully charged and the voltage after it is completely discharged is relatively large. The output voltage of various rectifiers is not only affected by the change of mains voltage, but also by the change of load. In order to ensure the stability of the power supply voltage, most electronic devices are powered by voltage regulators. In order to meet the working requirements of electronic equipment, it is necessary to add a linear voltage regulator circuit at the input end of the power supply to ensure a constan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 范莹莹
Owner JLQ TECH CO LTD
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