Low-voltage-difference linear voltage stabilizer circuit

A low dropout linear, voltage stabilizer technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as current compensation that cannot be suddenly increased, small capacitance, etc.

Active Publication Date: 2013-04-03
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the consideration of the process and production cost, the capacitance of the output capacitor 15 is usually small, which cannot effectively compensate the sud

Method used

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  • Low-voltage-difference linear voltage stabilizer circuit

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Embodiment Construction

[0028] When the load current suddenly increases, the output terminal of the low-dropout linear voltage regulator circuit in the prior art will generate a negative pulse, and the negative pulse will cause some devices to fail to work normally, which will seriously affect the reliability of the circuit in the load . Even if an output capacitor is connected to the output terminal of the low dropout linear regulator, the capacitance of the output capacitor is usually small due to the consideration of process and manufacturing cost, and the resulting negative pulse is still relatively large.

[0029] Therefore, an embodiment of the present invention provides a low dropout linear voltage regulator circuit, an auxiliary circuit is connected to the output end of the low dropout linear voltage regulator, and the auxiliary circuit includes a first resistor, a first capacitor and The pull-up transistor, due to the RC oscillating circuit formed by the first resistor and the first capacito...

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Abstract

The invention discloses a low-voltage-difference linear voltage stabilizer circuit. The low-voltage-difference linear voltage stabilizer circuit is characterized in that the output end of a low-voltage-difference linear voltage stabilizer is connected with an auxiliary circuit; the auxiliary circuit comprises a first resistor, a first capacitor and a pull-up transistor; and due to an RC (Resistance-Capacitance) oscillating circuit formed by the first resistor and the first capacitor, when negative pulse occurs on the voltage of the output end of the low-voltage-difference linear voltage stabilizer and the low-voltage-difference linear voltage stabilizer can not response in time, the RC oscillating circuit is utilized for opening the pull-up transistor, the pull-up transistor is utilized for pulling the voltage of the output end of the low-voltage-difference linear voltage stabilizer, so that the falling range of the voltage of the output end is less; and finally, the low-voltage-difference linear voltage stabilizer is utilized for restoring the voltage of the output end into the original output voltage. The low-voltage-difference linear voltage stabilizer circuit has the advantages that since the falling range of the voltage of the output end is less, a load device can work normally, and the reliability of the circuit in the load can not be influenced; and under the normal condition, the auxiliary circuit does not need to generate power consumption without influence on the normal working of a power supply.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a low-dropout linear regulator circuit. Background technique [0002] Low dropout regulator (Low Dropout Regulator, LDO) has the advantages of simple structure, low noise, low power consumption, small package and less peripheral application devices, etc., and is widely used in portable electronic products. The low-dropout linear voltage regulator belongs to the step-down transformer in the DC / DC converter. Under a certain load, its output voltage is within a certain range. Therefore, the low-dropout linear voltage regulator circuit system can ensure the output voltage of the power supply. The stability is conducive to improving the life of the power supply. [0003] Please refer to figure 1 , is a structural schematic diagram of an existing low-dropout linear regulator circuit. The low dropout linear regulator 10 includes: an error amplifier 11, a voltage regulating tube 12,...

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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