Pseudo digital low-pressure-difference linear voltage stabilizer and power management chip

Abstract

The invention discloses a pseudo digital low-pressure-difference linear voltage stabilizer and a power management chip. The pseudo digital low-pressure-difference linear voltage stabilizer comprises an NMOS transistor, a digital comparator, a charge pump and a grid level adjuster. A first input end of the digital comparator is electrically connected with an output end of the pseudo digital low-pressure-difference linear voltage stabilizer. A second input end of the digital comparator is electrically connected with a reference voltage signal line. A first gating end of the charge pump is electrically connected with an output end of the digital comparator. A power input end of the charge pump is electrically connected with a power voltage signal line. An input end of the grid level adjusteris electrically connected with an output end of the charge pump. A control end of the grid level adjuster is electrically connected with an output end of the digital comparator. An output end of the grid level adjuster is electrically connected with a grid of the NMOS transistor. The transient response performance and the working performance under low power voltages of the pseudo digital low-pressure-difference linear voltage stabilizer are improved, the circuit structure is simplified, and the chip area is reduced.

Description

technical field [0001] The embodiment of the present invention relates to electronic technology, in particular to a pseudo-digital low-dropout linear regulator and a power management chip. Background technique [0002] As users have higher and higher requirements for portable electronic products, power management chips are developing in the direction of low power supply voltage, low power consumption and fast transient response. [0003] Low-dropout linear regulators have stable output voltage and small voltage ripple, and play a vital role in power management chips. However, the existing low dropout linear regulator has the problem of poor transient response performance. Contents of the invention [0004] The invention provides a pseudo-digital low-dropout linear voltage regulator and a power management chip to improve the transient response performance of the low-dropout linear voltage regulator. [0005] In the first aspect, an embodiment of the present invention prov...

AI Technical Summary

Problems solved by technology

However, the existing low-dropout linear regulators have poor transient response performance.

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