Self-adapting current multiplication circuit and low-dropout-voltage linear voltage regulator integrating same

A low-dropout linearity and current multiplication technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve the problems of reducing the robustness of low-dropout linear regulators and not improving the performance of low-dropout linear regulators. , to achieve the effect of fast response and low quiescent current
CN104460802AActive Publication Date: 2015-03-25UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2015-03-25

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Abstract

The invention discloses a self-adapting current multiplication circuit and a low-dropout-voltage linear voltage regulator integrating the circuit. Firstly, constant bias voltage of an NMOS transistor and constant bias voltage of a PMOS transistor are generated through a constant bias voltage generating circuit, and then a lagging current comparator collects small part of load current which is compared with constant current; when a load is in a light load, the lagging current comparator shuts off a self-adapting current multiplication generating circuit, self-adapting current multiplication voltage VBPA rises, the bias current of an operational amplifier of the low-dropout-voltage linear voltage regulator lowers, in this way, stability is guaranteed, and quiescent dissipation is reduced; when the load is in a heavy load from a moderate load, the lagging current comparator turns on the self-adapting current multiplication generating circuit, the self-adapting current multiplication voltage VBPA lowers, the bias current of the operational amplifier increases to the specific times the bias current of the operational amplifier during the light load, the gain bandwidth product of the low-dropout-voltage linear voltage regulator increases, and transient response performance is enhanced.
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Description

technical field

[0001] The invention belongs to the technical field of power supply management, and more specifically relates to an adaptive current multiplication circuit and a low-dropout linear voltage regulator integrating the circuit. Background technique

[0002] Low dropout linear regulator is an important part of the power management system, it has the advantages of fast transient response, low quiescent current, simple structure, etc. It provides clean and stable energy for some noise-sensitive circuits, such as medical electronic circuits, etc. .

[0003] Conventional low-dropout linear regulators require an off-chip filter capacitor with a capacitance of 0.1 to 10 μF at the output end. This capacitor makes the main pole of the low-dropout linear regulator at the output end to ensure the stability of the low-dropout linear regulator. At the same time Output voltage overshoot and undershoot during transient transitions are also absorbed. However, the existing tech...

Claims

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