Low-pressure-difference linear stabilizer

A low-dropout linear, voltage regulator technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as increasing buffer current and high power consumption, and achieve increased power consumption and low power consumption. , the effect of improving the voltage conversion rate

Active Publication Date: 2012-11-21
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the traditional low-dropout linear regulator, if you want to achieve a larger voltage

Method used

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Embodiment Construction

[0020] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0021] figure 2 A block diagram of a low dropout linear regulator according to an embodiment of the present invention is schematically shown.

[0022] like figure 2 As shown, the low dropout linear voltage regulator according to the embodiment of the present invention includes: an error amplifier EA, a buffer BF, a first bypass P-type MOS transistor Mp1, a first resistor R1, a second resistor R2, and a series resistor ESR, series capacitor CL, and voltage slew rate boosting circuit (such as figure 2 shown in the dotted box).

[0023] Wherein, the output terminal of the error amplifier EA is connected to the input terminal of the buffer BF, and the output terminal of the buffer BF is connected to the gate of the first bypass P-type MOS tran...

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Abstract

A low-pressure-difference linear stabilizer comprises an error amplifier, a buffer, a first bypass P-type MOS (metal oxide semiconductor) transistor, a first resistor, a second resistor, a series resistor, a series capacitor and a voltage conversion rate increasing circuit. An output end of the error amplifier is connected to an input end of the buffer BF, an output end of the buffer BF is connected to a grid of the first bypass P-type MOS transistor, and a drain of the first bypass P-type MOS transistor serves as an output end of the low-pressure-difference linear stabilizer. The voltage conversion rate increasing circuit comprises a second bypass P-type MOS transistor, a first attachment NMOS (n-channel metal oxide semiconductor) transistor, a second attachment PMOS (p-channel metal oxide semiconductor) transistor, a third attachment PMOS transistor, a third attachment NMOS transistor, a second attachment NMOS transistor and a second current source. By the aid of the low-pressure-difference linear stabilizer, voltage conversion rate can be effectively increased without increasing power consumption. Therefore, the low-pressure-difference linear stabilizer is particularly applicable to low-power-consumption applications with the requirement on quick current load response.

Description

technical field [0001] The invention relates to the field of semiconductor circuit design, more specifically, the invention relates to a low-dropout linear regulator. Background technique [0002] Low dropout linear regulator LDO (low dropout regulator) is a power conversion chip relative to traditional linear regulators. Traditional linear regulators require the input voltage to be higher than the output voltage by more than 2v ~ 3V, otherwise they will not work properly. However, in some cases, the requirement that the input voltage is 2v to 3v higher than the output voltage cannot be met. For example, in the case of 5v input to 3.3v output, the voltage difference between input and output is only 1.7v, which is obviously not satisfied. Conditional. Aiming at this situation, a low-dropout linear regulator LDO-like power conversion chip is proposed. [0003] figure 1 A block diagram of a low dropout linear regulator according to the prior art is schematically shown. [...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 徐光磊
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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