Digital LDO circuit with fast transient response

Abstract

The invention discloses a digital LDO circuit with a fast transient response. The digital LDO circuit with the fast transient response comprises a clock-controlled comparator array, a controller, a power switching array, a sampling resistor network and an on-chip capacitor, wherein the controller is used for controlling the number of on-off power switches in the power switching array and then adjusting magnitude of output voltage; and when jumping changes of a load lead to large fluctuations of output voltage, the controller quickly restores the output voltage to a stable state which tends torated output voltage of the circuit by starting dichotomy adjustment. The digital LDO circuit has a high transient state response speed when facing the jumping changes of the output voltage due to different load changes, and in the transient state response, the output voltage is restored to a rated value through a nearly fixed fast adjustment period. Compared with other LDO circuits, the digital LDO circuit adopts a circuit structure of pure digital units, can work in the sub-1V low power supply voltage environment, and has the advantages of being low in static power consumption, high in integration level and fast in transient state response.

Description

technical field [0001] The invention relates to the technical field of integrated circuit power management and analog and mixed-signal circuit and system (Analog and mixed-signal circuit and system, AMSCS), in particular to a digital LDO circuit with fast transient response. Background technique [0002] In recent years, some electronic devices such as mobile phones, electronic bracelets, and tablet computers have become thinner and thinner, and at the same time, the internal system-on-chip (SoC) has become more and more integrated, which means that the energy consumption required for these devices to operate has increased significantly. The battery capacity has not increased accordingly. In order to improve the battery life of these devices and provide a good working voltage, it is necessary to introduce a power management chip between the power supply and these modules to take on the functions of transforming, distributing, detecting, stabilizing, and reducing noise of ele...

AI Technical Summary

Problems solved by technology

However, this solution has certain limitations. When dealing with different load changes, there is a possibility of poor transient response speed optimization.

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