a voltage regulator

Abstract

Disclosed is a voltage regulator (100). The voltage regulator (100) comprises: a voltage difference detection circuit (10), a power transistor (T0); and a first voltage regulation adjustment circuit (20) and a second voltage regulation adjustment circuit (30), wherein an input end (In1) of the first voltage regulation adjustment circuit (20) and an input end (In2) of the second voltage regulation adjustment circuit (30) are both electrically connected to a third end (N3) of the voltage difference detection circuit (10), and an output end (Out2) of the first voltage regulation adjustment circuit (20) and an output end (Out3) of the second voltage regulation adjustment circuit (30) are both electrically connected to a control end of the power transistor (T0); the voltage difference detection circuit (10) is used for detecting the voltage difference between a reference voltage (Vin) and an output end (Out1) of the voltage regulator (100) and outputting a detection signal; the first voltage regulation adjustment circuit (20) and the second voltage regulation adjustment circuit (30) respectively form a control loop with the power transistor (T0), and the first voltage regulation adjustment circuit (20) and the second voltage regulation adjustment circuit (30) are used for together controlling the voltage of the control end of the power transistor (T0) according to the detection signal. The output voltage of the voltage regulator (100) can quickly recover to a stable value during overshoot and undershoot.

Description

technical field [0001] The invention relates to the technical field of voltage stabilizers, in particular to a voltage stabilizer. Background technique [0002] As the application specifications of various electronic products such as mobile phones and TVs are getting higher and higher, the specifications of the regulated power supply of the internal application circuit are also relatively improved, including instantaneous stable speed and pumping capacity. Low-dropout linear regulator (Low-Dropout regulator, LDO) is the most widely used due to its advantages of low dropout voltage and high efficiency. However, as the output load current changes suddenly, the output voltage of the low dropout linear regulator also changes suddenly, that is, the output voltage appears undershoot or overshoot. Voltage fluctuations such as large voltage overshoot or voltage undershoot often take a certain amount of time to return to a stable value, which not only affects the transient response ...

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