An adaptive multi-stage boost boost chip with automatic current limiting protection function

Abstract

The invention discloses a self-adaptive multi-section voltage-boosting Boost chip with an automatic current-limiting protection function, and relates to the field of analog integrated circuits. The chip comprises a signal input detection circuit, a signal amplitude comparison circuit a voltage-boosting judgment time sequence control circuit, a current limiting time sequence control circuit, a voltage-boosting gear selection circuit and a voltage-boosting main body circuit. By detecting the amplitude of the envelope of the input signal, the voltage-boosting value is dynamically adjusted in realtime, and the most suitable voltage output in the internally set multi-section voltage value is selected, so that the working efficiency of the system is improved; in addition, during the dynamic switching process of the output voltage value of the DCDC boosted chip, the built-in automatic current-limiting protection function is added, and when it is detected that the system needs to output a voltage value which is higher than the current value, automatic current limiting process intervention is achieved, so that the risk of generating a large surge current when the output voltage is switchedis overcome.

Description

technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a Boost boost chip with self-adaptive multi-stage boost and automatic current limiting protection function. Background technique [0002] In recent years, portable devices have become more and more widely used. Most of these devices are powered by lithium batteries. The maximum voltage of a single lithium battery is 4.2V. Most of the portable devices use a DCDC boost internally to meet the needs of system power supply. Chip to raise the system power supply voltage. Most of the existing solutions are that the DCDC boost chip outputs a fixed voltage. The requirement for this voltage value is: the maximum signal amplitude that can meet the output requirements of the drive circuit in the system. However, under most working conditions, the output signal amplitude of the system drive circuit is very small, and the output voltage value of the DCDC boost chip is always at a hig...

AI Technical Summary

Problems solved by technology

However, under most working conditions, the output signal amplitude of the system drive circuit is very small, and the output voltage value of the DCDC boost chip is always at a high voltage, which will lead to low system efficiency, which does not conform to the trend of green energy saving and environmental protection, and is portable The battery life of the device will also be reduced

[0003] Therefore, those skilled in the art are committed to developing a Boost boost chip with an adaptive multi-stage boost and automatic current limiting protection function to overcome the low efficiency problem of using a DCDC boost chip to supply power to the drive circuit on current portable devices.

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