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Fast restoring low voltage drop linear voltage stabilizer

A linear voltage regulator and low dropout technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as the inability to provide fast and stable low dropout linear voltage regulators

Inactive Publication Date: 2008-07-16
SITRONIX TECH CORP
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AI Technical Summary

Problems solved by technology

[0016] It can be known from formula (3) that the damping coefficient ζ is related to the conduction of the output stage (g mp ) is inversely proportional to the bias current of the second-stage amplifier (I b2 ) is proportional to, because when the output current becomes larger (for example, from 0.1mA->150mA), the output stage conduction (gmp) also becomes larger (about 30 times), so the damping coefficient ζ will become smaller and less than 1 (even will be much smaller than 1), so that the frequency response will have a surge near the unity gain frequency, so that when the output current changes suddenly, the instantaneous response of the output voltage Vout will produce continuous waves and slow down its stable speed, so that it cannot provide A Fast and Stable Low Dropout Linear Regulator

Method used

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  • Fast restoring low voltage drop linear voltage stabilizer

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Embodiment Construction

[0026] Relevant detailed content and technical description of the present invention, now in conjunction with accompanying drawing, explain as follows:

[0027] Please refer to FIG. 3, which is a system circuit diagram of the present invention, which includes a low-dropout linear voltage regulator circuit 10 with a single Miller compensation capacitor (Miller capacitor) for gain amplification, which is supplied by a high-level supply voltage Vdd required driving voltage, the low dropout linear regulator circuit 10 has a second-stage amplifier 101 and has an output current I 10 For a load, it uses the current mirror principle to form a current detection circuit 20 with two transistors MP and MPR, and can use the amplifier 30 to form a negative feedback (feedback) mechanism to accurately detect low voltage The output current I of the step-down linear regulator circuit 10 10 , and output a corresponding comparison current I 20 , and in order to reduce the load and consumption of...

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Abstract

The present invention discloses one kind of fast restoring low voltage drop linear voltage stabilizer. The linear voltage stabilizer has one current detecting circuit to detect the output current, compares the output current with some reference current, and regulates the bias current of the second stage of amplifier dynamically. The linear voltage stabilizer has stable system damping coefficient greater than 1 in the case of high current output and fast restoring and stabilizing of the output voltage in the case of great change of output current.

Description

technical field [0001] The invention relates to a low drop-out linear regulator (LDO), in particular to a low drop-out linear regulator that can quickly return to a stable voltage output when the output current changes suddenly. Background technique [0002] As the communication market gradually matures and develops, the application of related ICs continues to mature. However, with the development of portable products such as mobile phones, the battery life is more important. How to increase the power of the battery and maintain its stability is a very challenging issue. In recent years, the low drop-out linear regulator (LDO for short) has become the mainstream of low-power step-down and voltage regulator circuits because of its improved conversion efficiency, coupled with its small size and low noise characteristics. It is widely used in various portable systems powered by batteries and communication-related electronic products. [0003] In existing products (methods), ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08
Inventor 刘深渊吕绍鸿
Owner SITRONIX TECH CORP
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