Quick starting circuit and method

Abstract

The invention discloses a quick starting circuit and method, which mainly solve the problem that the existing starting circuit does not have both power consumption and starting speed. According to thecircuit, rapid establishment of voltage of a circuit node is realized mainly by charging and discharging a capacitor C and a load capacitor Cload. When the circuit enable EN is changed from 0 to 1, the gate end voltage of the transistor MP4 is changed from 0 to 1, the gate end voltage of the MP5 is 0V, MP2 is turned on, MN2 is turned off, the MP5 charges the C through the resistor R, the voltageat the grid end of the MN3 / MN4 is increased step by step, the current flowing through the MN3 and the MN4 is gradually increased, and the capacitor Cload is discharged. When the voltage of the lower pole plate of the load capacitor Cload reaches the working voltage, the transistor MP3 is switched on, the grid voltage of the transistor MP5 is pulled up to VCC so as to be switched off, the current flowing through the MN3 and the MN4 is zero, and the starting of the circuit is completed. Therefore, the starting part can be automatically closed after the main circuit works, hard switching of a logic circuit is not needed, the quiescent working current of the circuit is not increased, and a quick starting function is achieved while power consumption is reduced.

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...

AI Technical Summary

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

Images