Low-voltage difference voltage adjuster

A voltage regulator, low dropout technology, applied in the direction of regulating electrical variables, control/regulation systems, instruments, etc., can solve the problems of low dropout voltage regulators that cannot be integrated on-chip, unstable, etc., to achieve good power supply rejection ratio performance, reduce number, the effect of simplifying the compensation circuit

Active Publication Date: 2010-03-10
灿芯创智微电子技术(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention is proposed in view of the problem that the low dropout voltage regulator in the related art cannot be integrated on-chip and is unstable. Therefore, the main purpose of the present invention is to provide a low dropout voltage regulator to solve at least one of the above problems

Method used

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Embodiment Construction

[0018] In an embodiment of the present invention, a low dropout voltage regulator solution is provided. In this implementation solution, an error amplifier with a one-stage amplifier structure, and a corresponding output amplifier and frequency compensation circuit are used to form a low-complexity low-to-moderate voltage regulator. for low dropout voltage regulators integrated into a single chip.

[0019] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0020] image 3 It is a structural block diagram of the low dropout voltage regulator of the present invention. like image 3 As shown, the low dropout voltage regulator of the present invention includes:

[0021] An error amplifier 10, the error amplifier 10 is a one-stage folded cascode amplif...

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Abstract

The invention discloses a low-voltage difference voltage adjuster, belonging to the technical field of an electronic circuit. The low-voltage difference voltage adjuster comprises an error amplifier,an output amplifier and a frequency compensating circuit, wherein the error amplifier is a first-class folding cascode amplifier, the output amplifier is coupled with the error amplifier, receives control voltage and comprises a transistor and two divider resistors which are connected in series; the frequency compensating circuit is respectively coupled with the error amplifier and the output amplifier; and the frequency compensating circuit comprises a voltage-controlling current source circuit consisting of at least one transistor and at least one compensating capacitor coupled with the voltage-controlling current source circuit. The low-voltage difference voltage adjuster can solves the problems that the current voltage adjuster has larger compensating capacitance and can not carry outon-chip integration, can provide complete chip integration, has good voltage-suppression specific characteristic, reduce the number of the compensating capacitance and simplify the compensating circuit.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a low-dropout voltage regulator. Background technique [0002] Low Dropout Regulator (Low DropOut Regulator, referred to as LDO) is widely used in the power supply of portable electronic equipment, the structure of conventional low dropout voltage regulator is as follows: figure 1 As shown, its core circuit is composed of an error amplifier, an output amplifier circuit and a frequency compensation circuit, where the frequency compensation circuit consists of an off-chip compensation capacitor C 0 and series resistor R ESR composition. figure 1 The working principle of the low-dropout voltage regulator shown is: if the load RL changes to reduce the output voltage Vout, the output voltage Vout is divided by the resistors R1 and R2 and the voltage fed back to the positive terminal of the error amplifier is also reduced, because the reference voltage Vref Remains uncha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56H03F3/16H03H11/02
Inventor 高雷声周玉梅蒋见花
Owner 灿芯创智微电子技术(北京)有限公司
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