Low dropout linear regulator with fast transient response

Abstract

The invention belongs to the field of integrated circuit design, in particular to a low dropout linear regulator with fast transient response. The regulator comprises a reference voltage source, an error amplifier, a series adjustment tube MNO, and a resistor feedback network composed of a first resistor R1 and a second resistor R2, wherein the regulator further comprises a buffer connected between an output end of the error amplifier and a gate end of the series adjustment tube MNO, a load transient response enhancement circuit connected between a gate end and a source end of the series adjustment tube MNO, an adaptive compensation control circuit connected between the error amplifier and the load transient response enhancement circuit, and a bias circuit that provides an operating current. Since the adaptive zero compensation improves the loop stability of the regulator, the NMOS series adjustment tube and the load transient response enhancement circuit enhance the load transient response of the regulator, the low dropout linear regulator with fast transient response achieves an improvement in load transient response performance of the low dropout linear regulator in the case ofhaving no off-chip capacitance and no significant increase in static power consumption.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, in particular to a low-dropout linear regulator with fast transient response. Background technique [0002] Low dropout linear regulator (LDO) is widely used in SoC design because of its simple structure, low power consumption, small output ripple, and few peripheral components to supply power to different functional modules. Such as figure 1 As shown, a typical low-dropout linear regulator is generally composed of a reference voltage circuit, an error amplifier, a resistor feedback network composed of a series regulator MP0 and resistors R1 and R2, where C L is the output load capacitance, I L is the output load current. [0003] With the advancement of semiconductor manufacturing technology, the power supply voltage of digital integrated circuits has been continuously reduced, and the requirements for the transient response of the LDO power supply for it have increased accordingly. ...

AI Technical Summary

Problems solved by technology

At the same time, the level of circuit integration continues to increase and the power consumption increases, further deteriorating the load transient response of the LDO

The traditional LDO structure is difficult to meet the design requirements, especially for LDOs without external capacitors, it is more necessary to improve the technology of LDO load transient response

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