A quick start circuit and method

Abstract

The invention discloses a quick starting circuit and method, which mainly solves the problem that the power consumption and starting speed of the existing starting circuit do not have both. The circuit mainly realizes the rapid establishment of the voltage of the circuit node by charging and discharging the capacitor C and the load capacitor Cload; when the circuit enable EN changes from 0 to 1, the gate terminal voltage of the transistor MP4 changes from 0 to 1, and the gate terminal voltage of MP5 The terminal voltage is 0V, MP2 is turned on, MN2 is turned off, MP5 charges C through the resistor R, the gate voltage of MN3 / MN4 increases step by step, the current flowing through MN3 and MN4 gradually increases, and the capacitor Cload is discharged. When the voltage of the lower plate of the load capacitor Cload reaches the working voltage, the transistor MP3 is turned on, and the gate voltage of the transistor MP5 is pulled up to VCC to turn off, the current flowing through MN3 and MN4 is zero, and the circuit startup is completed. After the main circuit is working, the startup part will be automatically turned off, without hard switching of the logic circuit, without increasing the static working current of the circuit, and it has a fast startup function while reducing power consumption.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a quick start circuit and method. Background technique [0002] In an integrated circuit, the startup speed of a circuit determines the settling time between the circuit's off state and normal operation. The start-up circuit needs to provide a large current after the circuit is enabled to quickly establish the circuit to the normal working voltage point. After the circuit works normally, the start-up circuit needs to be automatically shut down, and the quiescent working current of the circuit cannot be increased. [0003] In the existing start-up circuit, the fast start-up speed and low power consumption are contradictory, that is, if the start-up speed is fast, the corresponding power consumption will also increase, and if the power consumption is reduced, the start-up speed will be correspondingly slowed down. Contents of the invention [0004] The purpose of the...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a quick start circuit and method, which mainly solves the problem that the power consumption and start speed of the existing start circuit do not have both

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