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A low dropout linear regulator

A low-dropout linear and voltage regulator technology, which is applied in the direction of instruments, electrical variable adjustment, control/regulation systems, etc., can solve the problems of long transient response time, large floor space, and inability to gain, etc., and achieves simplification of complexity, Effects of reducing power consumption and improving transient response speed

Inactive Publication Date: 2017-04-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But advanced integrated circuit fabrication techniques require low supply voltages that cannot maintain sufficient gain for op amps in analog-controlled LDOs
Another disadvantage of the analog-controlled LDO is that it occupies a large area, which is not easy to realize the integration of nanoscale SOC
However, the number of traditional digitally controlled LDO power MOS tubes is large, resulting in a long transient response time

Method used

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  • A low dropout linear regulator
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Embodiment Construction

[0012] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0013] Such as figure 1 As shown, a low dropout linear voltage regulator of the present invention includes control logic, ADC, power MOS array, first capacitor C1, second capacitor C2, inductor L, first resistor R1, second resistor R2, third Resistor R3, fourth resistor R4, first constant voltage source V1, second constant voltage source V2, third constant voltage source V3 and load current source I1; the power supply terminal of the control logic, the power supply terminal of the ADC and the power MOS array The power supply terminals of each are connected to the positive pole of the first constant voltage source V1, and the negative pole of the first constant voltage source is grounded; the first voltage input terminal of the control logic is connected to its second voltage input terminal through the first capacitor C1, and the second voltage of the control l...

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Abstract

The invention belongs to the technical field of integrated circuits and relates to a low-dropout linear regulator. The main technical scheme of the present invention is that the control logic is formed by a full differential structure, a low-pass filter, and a high-pass filter; an ADC is formed by a bias circuit, a differential common-source circuit, and a comparator; the buffer and the The PMOS tube constitutes the power tube, and 124 power tubes are symmetrically arranged according to certain rules to form a power tube array. The beneficial effect of the invention is that the circuit structure is novel, the complexity of the control logic is simplified, the transient response speed is improved, and the power consumption is reduced at the same time, so that the circuit is more suitable for nanometer SOC integration.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to a low-dropout linear regulator. Background technique [0002] In power supply design, voltage regulation is the most basic and common function of power management circuits. LDO is the most commonly used circuit in voltage regulation power management chips, and widely exists in communications, electronics and some independent SOC systems. At present, the research of LDO is mainly concentrated in the field of analog control. The traditional analog control LDO is mainly composed of four parts, the reference voltage circuit, the error amplifier, the adjustment tube and the resistance feedback network. But advanced IC fabrication techniques require low supply voltages that cannot maintain sufficient gain for op amps in analog-controlled LDOs. Another disadvantage of the analog-controlled LDO is that it occupies a large area, which is not easy to realize the integration of na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 甄少伟包晴晴李韫伊罗萍贺雅娟张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA