CN-121983930-A - High-low voltage conversion circuit and integrated circuit with hot plug surge suppression function

CN121983930ACN 121983930 ACN121983930 ACN 121983930ACN-121983930-A

Abstract

The invention belongs to the technical field of integrated circuits, and provides a high-low voltage conversion circuit and an integrated circuit with a hot plug surge inhibiting function, wherein a drain electrode and a source electrode of an NMOS power tube are respectively connected with a high-voltage input end and a low-voltage circuit module; the transient response module is connected between the high-voltage input end and the grid electrode of the NMOS power tube and used for lifting the grid electrode voltage to enable the NMOS power tube to be conducted and discharge surge charges when a hot plug transient state is generated, and the steady voltage division module is connected between the high-voltage input end and the ground and is connected with the source electrode of the NMOS power tube. The invention solves the problem that the hot plug and the high-low voltage conversion structure cannot be integrated effectively due to the fact that the working conditions are opposite, simultaneously gives full play to the characteristics of the opening and closing conditions of the NMOS tube, and adopts an open loop structure to ensure the response speed, so that surge current can be released effectively in the transient process, and the function of high-low voltage conversion can be realized under the steady state condition.

Inventors

Lv Zhenxi
HUANG NIANYA
XIN ZHIMIN

Assignees

无锡靖芯科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260122

Claims (8)

1. The utility model provides a high-low voltage conversion circuit with restrain hot plug surge function which characterized in that includes: the NMOS power tube, drain electrode and source electrode are connected with the high-voltage input end and the high-voltage circuit module respectively, and are used for hot plug and core switch functions of high-low voltage conversion; The transient response module is connected between the high-voltage input end and the grid electrode of the NMOS power tube and is used for lifting the grid electrode voltage when a surge is generated in a hot plug transient state, so that the NMOS power tube is in a complete conduction state, and surge charges are discharged to the ground; The steady-state voltage dividing module is connected between the high-voltage input end and the ground and is used for providing stable divided voltage for the grid electrode of the NMOS power tube under the steady state of input voltage and defining the voltage of the rear-stage circuit module; And one end of the transient ultra-low resistance passage is connected with the source electrode of the NMOS power tube, and the other end of the transient ultra-low resistance passage is grounded and is used for providing a quick release passage for surge charges.
2. The high-low voltage conversion circuit with the function of inhibiting hot plug surge according to claim 1, wherein the transient response module comprises a capacitor C 0 and m first nano-tubes which are connected in series, m is larger than or equal to 1, and the lowest trigger voltage of the transient response module is set by adjusting the value of m.
3. The high-low voltage conversion circuit with the function of inhibiting hot plug surge according to claim 1, wherein the transient ultra-low resistance path is composed of n second zener diodes connected in parallel, and n is larger than or equal to 1.
4. The high-low voltage conversion circuit with the function of inhibiting hot plug surge according to claim 1, wherein the steady-state voltage dividing module comprises a resistor R 0 and a resistor R 2 , the resistor R 0 and the resistor R 2 are connected in series between a high-voltage input end and ground, and a voltage dividing node of the resistor R 0 and the resistor R 2 is used as an output end.
5. The high-low voltage conversion circuit with the function of inhibiting hot plug surge according to claim 1, further comprising a gate protection module connected in series between an output end of the steady-state voltage division module and a gate of the NMOS power tube for improving a highest withstand voltage of the gate of the NMOS power tube.
6. The high-low voltage conversion circuit with hot plug surge suppression function according to claim 5, wherein the gate protection module comprises a resistor R 1 , a diode D 0 and a third zener diode connected in series in order.
7. The high-low voltage conversion circuit with the function of inhibiting hot plug surge according to claim 1, wherein the steady-state voltage dividing module is calculated by adopting the following formula when defining the voltage of the later-stage voltage dividing module: V low-voltage power supply = V G - V th Wherein V low-voltage power supply is the voltage value of the low-voltage circuit module, V G is the gate voltage of the NMOS power transistor, and V th is the threshold voltage of the NMOS power transistor.
8. An integrated circuit comprising the high-low voltage conversion circuit having the function of suppressing a hot plug surge according to any one of claims 1 to 7.

Description

High-low voltage conversion circuit and integrated circuit with hot plug surge suppression function Technical Field The invention belongs to the technical field of integrated circuits, and particularly relates to a high-low voltage conversion circuit with a hot plug surge suppression function and an integrated circuit. Background Semiconductor technology has realized a striding development from the birth of the first chip to the mass production of system level integrated circuits today. Along with the continuous improvement of the intelligent degree of life, the market has put forward higher requirements on the aspects of chip integration level, response speed, cost control, use convenience and the like. In the application of a high-voltage high-power system, the efficient realization of hot plug surge suppression and high-low voltage conversion technology is always a key problem faced by the industry. In the traditional technical scheme, a large-area power tube is generally required to be adopted to realize effective discharge of hot plug surge charges, so that the cost of a chip is increased, high-low voltage conversion is realized by a high-voltage LDO structure, and the high-low voltage conversion is limited by the negative feedback characteristic of an LDO closed loop. In addition, although the hot plug and the high-low voltage conversion structure are integrated near the chip input port, the two working conditions have opposites, and the traditional scheme can only be used as an independent module design, so that the improvement of the chip integration level is severely restricted. The related patent also has obvious defects that the China patent with the publication number of CN111092546A discloses a surge suppression slow start circuit for supporting hot plug, adopts an RC network to realize hot plug anti-surge, is only suitable for a low-voltage input scene, cannot control hot plug trigger voltage, and has poor suitability. The Chinese patent with publication number CN215185854U discloses a surge protection circuit, a multistage feedback control circuit is formed by connecting a current mirror and a zener diode in series, the establishment of feedback needs a long time, and the surge current release of the circuit is formed by the multistage control circuit, so that the release speed of charges in hot plug is slowed down, and the capability of hot plug for preventing surge is reduced. The structure that the power tube is directly grounded is that the front stage of the power tube still has a path to input during steady state, so that the grid electrode of the power tube still has higher voltage during steady state, and the power tube needs larger size in addition to effectively discharging charges, so that the power tube has certain electric leakage when the hot plug surge charges are released and the chip is in steady state operation, thereby generating extra power consumption, and the structure does not have the function of high-low voltage conversion. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a high-low voltage conversion circuit and an integrated circuit with a function of inhibiting hot plug surge. In order to solve the technical problems, the invention provides the following technical scheme: A first object of the present invention is to provide a high-low voltage conversion circuit with a function of suppressing a hot plug surge, comprising: the NMOS power tube, drain electrode and source electrode are connected with the high-voltage input end and the high-voltage circuit module respectively, and are used for hot plug and core switch functions of high-low voltage conversion; The transient response module is connected between the high-voltage input end and the grid electrode of the NMOS power tube and is used for lifting the grid electrode voltage when a surge is generated in a hot plug transient state, so that the NMOS power tube is in a complete conduction state, and surge charges are discharged to the ground; The steady-state voltage dividing module is connected between the high-voltage input end and the ground and is used for providing stable divided voltage for the grid electrode of the NMOS power tube under the steady state of input voltage and defining the voltage of the rear-stage circuit module; And one end of the transient ultra-low resistance passage is connected with the source electrode of the NMOS power tube, and the other end of the transient ultra-low resistance passage is grounded and is used for providing a quick release passage for surge charges. Further, the transient response module comprises a capacitor C 0 and m first nano tubes which are connected in series, m is larger than or equal to 1, and the lowest trigger voltage of the transient response module is set by adjusting the value of m. Further, the transient ultralow-resistance passage is formed by n second zener diodes which are connected in parallel, and n is mo