Method and circuit for inhibiting overshoot of LDO output voltage

Abstract

The invention discloses a method for inhibiting the overshoot of LDO output voltage, relates to the technical field of semiconductor integrated circuits, and solves the technical problem that a largecapacitor is required to be used for inhibiting the overshoot of LDO output voltage. According to the method, the output voltage of an LDO is acquired in real time through a voltage acquisition module, and the output voltage is converted into a feedback signal which can linearly change along with the output voltage; an output voltage control module is used for generating a control signal for representing the change of the output voltage based on the feedback signal, and the control signal is used for adjusting the control end of the LDO so as to inhibit overshoot voltage when the output voltage of the LDO contains the overshoot voltage. The invention also discloses a method for inhibiting the overshoot of LDO output voltage. According to the method and the system, the overshoot phenomenonof LDO output voltage can be effectively inhibited, the whole LDO does not need to adopt a large capacitor, the chip area is saved, meanwhile, the whole power consumption of the LDO for inhibiting voltage overshoot is small, and the energy is saved.

Description

technical field [0001] The present invention relates to the technical field of semiconductor integrated circuits, more specifically, it relates to a method and circuit for suppressing LDO output voltage overshoot. Background technique [0002] Since an integrated chip contains many modules, and the working voltages required by these modules may be different from each other, we usually use power management chips to implement functions such as voltage conversion, power distribution, and detection. The full name of LDO is Low Drop-out Voltage Regulator (Low Drop-out Voltage Regulator), which is an integral part of the power management chip. The difference in output voltage can be very small. In addition, LDO itself has the characteristics of low power consumption, low noise, low quiescent current, and low cost, so it has been widely used. [0003] However, due to its own structural problems, the output voltage of the LDO will produce an instantaneous overshoot during the powe...

AI Technical Summary

Problems solved by technology

Most of the existing LDOs use larger on-chip capacitors or even off-chip capacitors to suppress the overshoot of the output voltage, which will cause a problem of large area, which does not meet the current requirements of high integration and small size of integrated circuits. Design requirements

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