Digital analog double-loop low-dropout linear voltage stabilizer

Abstract

The invention relates to a digital analog double-loop low-dropout linear voltage stabilizer. The voltage stabilizer comprises an operational amplifier comparison unit, a control unit and a modulationgroup unit, wherein the operational amplifier comparison unit is used for comparing an output voltage of the voltage stabilizer with a target voltage of the voltage stabilizer, and outputting a firstcomparison result and an operational amplifier amplification error value; the control unit is connected with the output ends of the operational amplifier comparison unit and the voltage stabilizer, and is used for obtaining a jump detection result according to the first comparison result and obtaining a second comparison result according to the output voltage of the voltage stabilizer; and the modulation group unit is connected with the operational amplifier comparison unit and the control unit, and modulating the output voltage of the voltage stabilizer according to the first comparison result, the operational amplifier amplification error value, the jump detection result and the second comparison result. The modulation group unit is adopted to modulate the output voltage of the voltage stabilizer, and voltage stabilization can be rapidly completed when the voltage change is relatively great, so that the transient response speed of the voltage stabilizer is increased, and the problemsof overshoot and undershoot of the output voltage of the voltage stabilizer are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to a digital-analog double-loop low-dropout linear regulator. Background technique [0002] At present, a low dropout regulator (LDO for short), as an important module of power management, has been widely used in various fields of microelectronic technology. [0003] In an LDO circuit, the way the transistor current is controlled determines the structural classification of the LDO. The analog LDO controls the voltage from the gate to the source of the power transistor, and then controls the magnitude of the outflow current to stabilize the output voltage; while the digital LDO controls the magnitude of the outflow current by controlling the number of on and off of the power transistor to stabilize the output voltage. Analog LDOs usually consist of an error amplifier and a power transistor, while digital LDOs consist of a digital controller and an array o...

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Problems solved by technology

[0004] However, when the traditional digital LDO load jumps, it can only turn on or off the transistors in the controlled transistor array sequentially. The output voltage recovery time of the regulator is slow, and it lacks a good transient response. When the voltage is large, the voltage stabilization work is completed quickly, and the output voltage of the regulator is prone to overshoot or undershoot problems

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