Low-differential-pressure voltage stabilizer circuit with auxiliary circuit

Abstract

The invention discloses a low-differential-pressure voltage stabilizer circuit with an auxiliary circuit. The low-differential-pressure voltage stabilizer circuit with the auxiliary circuit comprises a low-differential-pressure voltage stabilizer, a source electrode follower PMOS (P-channel metal oxide semiconductor) transistor and a biasing circuit, wherein the output end of the low-differential-pressure voltage stabilizer outputs a voltage signal; the source electrode of the source electrode follower PMOS transistor is connected with the output end of the low-differential-pressure voltage stabilizer for reducing voltage overshoot amount when the voltage signal is overshot; the output end of the biasing circuit is connected with the grid electrode of the source electrode follower PMOS transistor for providing bias voltage to the source electrode follower PMOS transistor; and the bias voltage is similar to the threshold voltage of the source electrode follower PMOS transistor. The low-differential-pressure voltage stabilizer circuit with the auxiliary circuit, which is disclosed by the invention, has a small voltage overshoot amount when the load current is reduced.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a low-drop voltage regulator circuit with an auxiliary circuit. Background technique [0002] In electronic equipment, the power supply voltage may usually vary within a large range. For example, a lithium-ion battery in a portable device can provide a voltage of 4.2 volts when it is fully charged, and can only provide a voltage of 2.3 volts after discharge. The range of variation is very large. big. The working circuit of electronic equipment usually requires a stable power supply voltage, so at present, a low dropout regulator (LDO: Low Dropout Regulator) is usually added to the input end of the power supply. Since the low dropout regulator has a set voltage regulation, its First, the actual power supply voltage is converted to the set regulated voltage, and then the converted regulated voltage is provided to the working circuit, thus ensuring that when the power supply volt...

AI Technical Summary

Problems solved by technology

When the output of the low dropout voltage regulator has a large overshoot voltage, it is easy to break down the gate oxide layer of the MOS, causing the device to fail

Therefore, the low dropout voltage regulator in the prior art needs to solve the problem of large overshoot voltage when the load current suddenly decreases

Images