Low-dropout voltage regulator having temperature proctive circuit

Abstract

The invention discloses a low-dropout voltage regulator with a temperature protection circuit, which comprises a band-gap reference circuit, an error amplifier, an output buffer stage, a PMOS power tube P1, feedback divider resistances R1, R2, the temperature protection circuit and a PMOS switch tube P2. The band-gap reference circuit passes through the error amplifier and the output buffer stage and then is connected with the PMOS power tube P1; one end of the temperature protection circuit is connected with an input end of the error amplifier, and the other end is connected with the PMOS switch tube P2; the drain of the PMOS switch tube P2 is connected with the gate of the PMOS power tube P1; one end of the feedback divider resistance R1 is connected with the drain of the PMOS power tube P1, and the other end is connected with the input end of the error amplifier. The invention directly utilizes the simple temperature protection circuit of band-gas reference voltage, which improves the sensitivity of temperature protection circuit and the setting performance of temperature scope for stopping working and recovering working of the regulator.

Description

technical field [0001] The invention relates to a linear voltage regulator, in particular to a low dropout linear voltage regulator with a temperature protection circuit. Background technique [0002] Low dropout linear regulators are used to generate a low, regulated output voltage from a high, noisy voltage source. The advantages of low-dropout linear regulators are: high efficiency, low output voltage noise, simple circuit structure, small size, and low price. It occupies a large proportion in power management chips and is widely used in portable products, especially in the field of consumer electronics. a wide range of applications. [0003] With the continuous improvement of the scale of integrated circuits and the integration of some high-power devices, the power consumption of the entire integrated circuit system has increased sharply, so that the integrated circuit has to consider dealing with circuit damage when the circuit temperature is too high. In the applicat...

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Problems solved by technology

[0003] With the continuous improvement of the scale of integrated circuits and the integration of some high-power devices, the power consumption of the entire integrated circuit system has increased sharply, so that the integrated circuit has to consider avoiding circuit damage when the circuit temperature is too high

In the application of low-dropout linear regulators, if the regulator does not have a temperature protection circuit, it is very easy to be damaged after the operation reaches a certain high temperature.

The traditional process is generally realized by using a bipolar temperature protection circuit. Since it is not easy to integrate bipolar devices in the CMOS process, this method is not suitable for low dropout linear regulators under the CMOS process.

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