A Fast Response High Speed ​​Linear Regulator

Abstract

The invention discloses a fast-response high-speed linear voltage regulator, comprising PMOS transistors P1, P2, P3, P4 and NMOS transistors N1, N2 to form a first-stage operational amplifier, NMOS transistors N3, N4, N5, resistors R2 and resistors R1 constitutes the second-stage operational amplifier, NMOS transistor Nc and capacitor Cc constitute a dynamic compensation circuit, the first and second two-stage operational amplifiers, PMOS power transistor Ppower, and resistors Rfb1 and Rfb2 constitute a feedback network, through which resistor Rfb1 and resistor Rfb2 are connected The generated feedback voltage fb is connected to the gate of P4 and compared with the reference voltage Vref connected to the gate of P3, and the PMOS power transistor Ppower is controlled to generate a stable output voltage Vout, Vout=Vref(Rfb1+Rfb2) / Rfb2.

Description

technical field [0001] The invention relates to a power management chip, in particular to a fast-response high-speed linear voltage regulator, which belongs to the technical field of integrated circuits. Background technique [0002] With the widespread use of portable electronic products in all aspects of work and life, higher requirements are placed on the performance of the power supply, especially the system's anti-interference ability, low-voltage working ability, and low power consumption. Linear regulator (LDO) power supply can provide excellent anti-power interference ability and low noise characteristics, and is widely used in circuit design, but with the development of communication technology, the on-time, switching time and off-time of electronic terminals And other performance put forward higher requirements, so the analog integrated circuit is required to have a faster response speed, and the power supply bias circuit responsible for providing the DC operating ...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of the above two prior art LDO circuits are: the increase of circuit stages and feedback capacitance will affect the loop stability of the circuit, and even deteriorate the performance of the original LDO circuit; and the fast response circuit cannot be adjusted in real time according to the load change. thus limiting the scope of application

Die area and cost have increased significantly, so it is not suitable for the current development trend of portable devices

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