Capacitor-less low dropout regulator structure

A low-dropout voltage regulator and capacitor-free technology, which is applied in the direction of instruments, adjusting electrical variables, control/regulation systems, etc., can solve problems such as the inability to drive large capacitive load circuits, reduce influence, realize frequency compensation, and increase damping The effect of the coefficient

Active Publication Date: 2013-10-23
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the data in Table 1 that the load capacitance C of the existing capacitor-less low-dropout voltage regulator OUT The best value is only 600pF, when this non-capacitive low-dropout voltage regulator is integrated on-chip, it cannot drive large capacitive load circuits

Method used

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  • Capacitor-less low dropout regulator structure
  • Capacitor-less low dropout regulator structure
  • Capacitor-less low dropout regulator structure

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Embodiment Construction

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] image 3 The specific circuit diagram of the capacitor-free low dropout voltage stabilizer provided by the present invention.

[0034] Such as image 3 As shown, the capacitor-free low dropout voltage regulator provided in this embodiment includes: a first-stage amplifier 100, a second-stage buffer 200, a voltage divider circuit 300 and an output transistor M power .

[0035] The two input terminals of the first-stage amplifier 100 are respectively connected to the reference voltage Ref and the voltage dividing point A of the voltage divider circuit 300, and the output terminal B is connected to the input terminal of the second-stage buffer 200; the voltage dividing circuit 300 is connected to the output terminals O and Between ground; output transistor M pow...

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Abstract

The invention relates to a capacitor-less low dropout regulator, which comprises a first-stage amplifier, a second-stage buffer, a voltage division circuit and an output transistor, wherein an impedance device is introduced between an output end of a common drain amplification circuit of the second-stage buffer and the ground, the impedance device is an active resistor device or a passive resistor device which is used for increasing the output resistance of the second-stage buffer, effectively controlling the damping coefficient of the capacitor-less low dropout regulator and reducing the influence of complex poles on dominant poles. Frequency compensation of the capacitor-less low dropout regulator is realized, and under the condition that a capacitor device does not need to be increased additionally, low-dropout output voltage is ensured to be precise and stable and have low noise, and the capacitor-less low dropout regulator can be used in a circuit capable of realizing monolithic integration and driving larger capacitive load.

Description

Technical field [0001] The invention relates to a voltage stabilizer structure, in particular to a capacitor-free low-dropout voltage stabilizer structure, and belongs to the technical field of semiconductors. Background technique [0002] Almost all electronic products have regulated power supplies, and the purpose of regulation is to meet the needs of electronic devices. The voltage stabilizer is an important part of this power supply, and its role is to keep the output voltage / current within the desired range. Low Dropout Regulator (LDO, also known as low dropout voltage regulator) is a direct current (DC) linear regulator with a small input and output voltage difference. The voltage difference of the regulator determines the lowest available operating voltage (Supply Voltage). Due to the increasing requirements of current systems for efficiency and the increasingly prominent problem of power consumption, LDO regulators have become the preferred choice for linear regulators ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 段新东
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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