Fast transient response low-dropout linear voltage regulator

Abstract

The invention discloses a fast transient response low-dropout linear voltage regulator, relating to the integrated circuit technique. The linear voltage regulator comprises a reference circuit, an error amplifier and a CMOS conduction element and also comprises a comparator circuit, wherein the comparator circuit comprises a first comparator and a second comparator; the positive input ends of the first comparator and the second comparator are connected with a load output end; the negative input end of the first comparator is connected with a first reference level point A; the negative input end of the second comparator is connected with a second reference level point B; the level of the first reference level point A is higher than that of the second reference level point B; the output end of the first comparator is connected with a first switching tube; the output end of the second comparator is connected with a second switching tube; the input end of the first switching tube is connected with an external power supply, and the output end of the first switching tube is connected with the load output end; and the output end of the second switching tube is grounded, and the input end of the second switching tube is connected with the load output end. According to the linear voltage regulator disclosed by the invention, the static power consumption of the circuit is reduced, the circuit structure is simple, and the power consumption is low.

Description

technical field [0001] The present invention relates to integrated circuit technology. Background technique [0002] With the rapid development of electronic technology, various portable electronic products (laptops, IPADs, smart phones, etc.) have continuously increased demands for multimedia data streams, audio playback, clearer displays, and more entertainment. Efficient power management solutions appear to be It is becoming more and more important to improve the energy utilization of devices to extend battery life and chip working time. Low dropout linear regulator (LDO) has become one of the most competitive power supply solutions due to its low cost, voltage drop, small package size, less peripheral equipment, low noise, low ripple, and high power supply rejection ratio. [0003] Traditional LDOs such as figure 1 Therefore, it includes a reference voltage unit Vref, an error amplifier EA, a feedback circuit, a load capacitor CL, a load resistor RL, an output terminal...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a low-dropout linear voltage regulator capable of quick response to solve the problem that the output voltage fluctuates too much and the time from fluctuation to stabilization is too long when the load of the low-dropout linear voltage regulator suddenly jumps. long question

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