Transiently-responding improved circuit for low-dropout linear regulator

Abstract

The invention discloses a transiently-responding improved circuit for a low-dropout linear regulator. The transiently-responding improved circuit comprises a first PMOS tube P1, a second PMOS tube P2,a third PMOS tube P3, a fourth PMOS tube P4, a fifth PMOS tube Mp, a first NMOS tube N1, a second NMOS tube N2, a third NMOS tube N3, a fourth NMOS tube N4, a fifth NMOS tube N5, a first resistor R1,a second resistor R2, a third resistor RL, a first capacitor CL, a first voltage Vn1, a second voltage Vn2, a third voltage Vpu, a fourth voltage Vpd, a first current I1, a second current I2, a thirdcurrent I3, a fourth current I4, a first input voltage Vin, a first output voltage Vout and a first ground GND. The transient response of the LDO is improved, and overshoot and undershoot are automatically reduced according to a circuit state. A transistor of the transiently-responding improved circuit works in a stable state in a cutoff zone, the static current can be effectively reduced, and the efficiency of a power supply can be improved. The transiently-responding improved circuit adopts common electronic devices and is simple and low in cost.

Description

technical field [0001] The invention relates to a transient response improvement circuit for a low-dropout linear voltage regulator, and belongs to the technical field of voltage regulator improvement circuits. Background technique [0002] At present, low-dropout linear regulators (LDOs) have been widely used in integrated circuits due to their advantages such as low cost, simple circuit, small quiescent current, and low noise. In practical applications, the LDO has problems such as slow transient response, large overshoot and undershoot of the output voltage, and large quiescent current, which increase power consumption and reduce efficiency. [0003] Aiming at these problems, this patent designs a transient response improvement circuit for a low dropout linear regulator (LDO), which improves the transient response of the LDO, reduces overshoot and undershoot, reduces quiescent current, and improves power supply efficiency. Contents of the invention [0004] Purpose: In...

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Problems solved by technology

In practical applications, LDO has problems such as slow transient response, large overshoot and undershoot of output voltage, and large quiescent current, which increase power consumption and reduce efficiency.

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