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Linear voltage stabilizer with low pressure differential and Sink and Source current capabilities

A low-dropout linear and voltage stabilizer technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as transient characteristic deterioration and difficult system compensation, and achieve reasonable current bias and good transient State characteristics, the effect of novel circuit design

Active Publication Date: 2012-04-11
昌芯(西安)集成电路科技有限责任公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional design generally only includes the Source current capability, and in the case of high output current, it is difficult to compensate the system, which will deteriorate the transient characteristics of the output

Method used

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  • Linear voltage stabilizer with low pressure differential and Sink and Source current capabilities
  • Linear voltage stabilizer with low pressure differential and Sink and Source current capabilities
  • Linear voltage stabilizer with low pressure differential and Sink and Source current capabilities

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Embodiment Construction

[0030] The present invention is described in further detail below in conjunction with accompanying drawing:

[0031] Such as image 3 As shown, the low dropout linear regulator with Sink and Source current capabilities of the present invention includes a reference voltage source 101, an error amplifier 102 directly connected to the reference voltage source 101, and connected to two output terminals of the error amplifier 102 respectively The bias circuit BIAS1103 and the bias circuit BIAS2104, the N-channel MOS transistor 105 connected to the output terminal of the bias circuit BIAS1103 and its sampling current limiting circuit 107, and the N-channel MOS transistor connected to the output terminal of the bias circuit BIAS2104 Two 106 and its sampling current-limiting circuit two 108, the compensation network 109 connected with the load circuit 110 and the error amplifier 102; the reverse input terminal of the error amplifier 102 is connected with the reference point voltage so...

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Abstract

The invention discloses a linear voltage stabilizer with a low pressure differential and Sink and Source current capabilities. The voltage stabilizer comprises a reference voltage source, an error amplifier, two biasing circuits, a first N channel MOS (Metal Oxide Semiconductor) tube and a sample collecting and current limiting circuit of the first N channel MOS tube, a second N channel MOS tube and a sample collecting and current limiting circuit of the second N channel MOS tube and a compensating unit of the whole circuit. The voltage stabilizer works by the working principle that: the error amplifier detects the connecting way of the output resistor; when the output resistor is grounded, the loop controls the first N channel MOS tube to pass through the Source current; when the output resistor is connected with the power supply, the loop controls the second N channel MOS tube to pass through the Sink current. The linear voltage stabilizer disclosed by the invention is creative in designing concept, convenient to use and wider in application due to larger load capacity.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment, and relates to a low-dropout linear voltage regulator, in particular to a low-dropout linear voltage regulator with Sink and Source current capabilities. Background technique [0002] LDO (Low-Dropout Voltage Regulator) is a DC linear regulator whose input voltage is greater than the output voltage. It has the advantages of fast input and output response, low noise, and low cost, so it is widely used in Various electronic equipment powered by batteries, communication equipment, power supplies, etc. [0003] When designing an LDO, the most critical issue is to perform frequency compensation. The traditional LDO uses ESR (Equivalent Series Resistance) on the output capacitor to generate a zero point and offset the pole on the gate of the adjustment tube to make the system stable. However, the ESR It is easily affected by the environment, such as temperature, etc., and changes greatly,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 代国定杨向一杨令黄冲袁政
Owner 昌芯(西安)集成电路科技有限责任公司
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