An ultra-low power low dropout linear regulator

Abstract

The invention relates to the technical field of power supply management, in particular to a low dropout regulator with ultra-low power consumption. The low dropout regulator with the ultra-low power consumption includes a main loop circuit, an output-voltage detection and first dynamic bias current generation circuit and a first current source, the first current source provides static bias currents Ib0 for an error amplifier of the main loop circuit, and the output-voltage detection and first dynamic bias current generation circuit is used for detecting the overvoltage and undervoltage of the output voltage of the main loop circuit and converting the overvoltage and the undervoltage into currents which are positively related to the overvoltage and the undervoltage and serve as first dynamic bias current Ib1 of the error amplifier of the main loop circuit. The low dropout regulator has the ultra-low power consumption (smaller than 300 nA), the response speed is high at the same time, the output voltage and currents are stable, the low dropout regulator has the function of over-temperature and overcurrent protection, and the safety and reliability are high.

Description

technical field [0001] The invention belongs to the technical field of power management, and in particular relates to an ultra-low power consumption low-dropout linear regulator. Background technique [0002] With the development of technology and the rapid popularization of portable electronic devices, the design of integrated circuits tends to be characterized by low power consumption, high security, high energy efficiency and high integration. [0003] The power management module is the basic unit circuit of the chip, and the low-dropout linear regulator (LDO, LowDropOutRegulator) as a power management module has been widely used in large-scale integrated circuit systems [0004] LDOs are widely used in low-power power management systems because they require fewer external components. Affected by low power consumption requirements, the structure of traditional LDO is relatively simple. When the power supply voltage or output load conditions change, because there is not e...

AI Technical Summary

Problems solved by technology

Affected by low power consumption requirements, the structure of traditional LDO is relatively simple. When the power supply voltage or output load conditions change, because there is not enough current to support the fast response of LDO, the output of LDO shows a large overvoltage or undervoltage phenomenon, and The time to return to a stable output value is also longer

In addition, because the protection function in the LDO needs to consume a certain amount of power consumption, most of the traditional low-power LDOs omit some protection functions, including over-temperature protection and over-current protection functions, such as the public patent: CN102789256B, which is not conducive to the work of the chip Safe, easy to overheat or overcurrent and lead to chip failure

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