Low-voltage-difference linear voltage stabilizer circuit

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,...

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 sudden increase in current, and will still form a large negative pulse, which is pulled down by the negative pulse After the output voltage will still drop to 1.5V or even lower

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