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Wide-input low-dropout linear voltage stabilizing circuit

A low-dropout linear, voltage-stabilizing circuit technology, applied in the field of voltage regulators and wide-input low-dropout linear voltage-stabilizing circuits, can solve problems such as difficult work, achieve low-voltage design, optimize transient characteristics, and wide operating voltage range Effect

Pending Publication Date: 2020-08-11
博流智能科技(南京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the minimum input voltage of this voltage buffer stage is limited, although this buffer stage has a lower requirement for Vdd_min than a source follower, it is still difficult to work in scenarios where the power supply voltage is lower than 1.5V

Method used

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  • Wide-input low-dropout linear voltage stabilizing circuit
  • Wide-input low-dropout linear voltage stabilizing circuit

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Embodiment Construction

[0052] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0054] The description in this part is only for several typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. The mutual replacement of the same or similar prior art means and some technical features in the embodiments is also within the scope of the description and protection of the present invention.

[0055] The invention discloses a wide-input low-dropout linear voltage regulator circuit, image 3 It is a schematic diagram of ...

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Abstract

The invention discloses a wide-input low-dropout linear voltage stabilizing circuit, which comprises a comparison circuit, a dynamic bias circuit, a wide-input buffer stage circuit, a power tube, a detection feedback circuit, a frequency compensation circuit and an off-chip capacitor, wherein the comparison circuit compares the feedback voltage with the reference voltage and adjusts the power tubeaccording to a comparison result to ensure the stability of the output voltage; the dynamic bias circuit dynamically adjusts the current of the wide-input buffer stage circuit according to the magnitude of the load current, so that the LDO circuit drives a large load with a small quiescent current; the wide-input buffer stage circuit drives a grid capacitor of the power tube to play an isolationrole; the detection feedback circuit is used for sampling output voltage and feeding back a sampling result to the input end of the comparison circuit; and the frequency compensation circuit is used for compensating the frequency of the LDO circuit to ensure the stability of the LDO circuit in the whole load range. According to the LDO circuit provided by the invention, an off-chip large capacitorcan be driven, and the low-voltage design of the LDO circuit is realized.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to a voltage stabilizer, in particular to a wide-input low-dropout linear voltage-stabilizing circuit. Background technique [0002] Low-dropout (Low-Dropout) linear regulator, referred to as LDO, is widely used in electronic systems. LDO is a linear regulator, and its characteristic is that the noise of the circuit itself is low and the output voltage ripple is small. The disadvantage of LDO is also obvious, the energy efficiency of the power supply is not high, and the efficiency is related to the input and output voltage difference. Switching power converter is another type of power management. Its biggest advantage is high energy efficiency, but the output voltage ripple is large. A common application is to place the LDO after the switching power supply, while taking into account the energy efficiency of the power supply, and at the same time suppress the power suppl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 田缝吴俊韩洪征李冉施子韬宋永华
Owner 博流智能科技(南京)有限公司
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