WO2020108312A1 - Fast-start chip power supply - Google Patents
Fast-start chip power supply Download PDFInfo
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- WO2020108312A1 WO2020108312A1 PCT/CN2019/118199 CN2019118199W WO2020108312A1 WO 2020108312 A1 WO2020108312 A1 WO 2020108312A1 CN 2019118199 W CN2019118199 W CN 2019118199W WO 2020108312 A1 WO2020108312 A1 WO 2020108312A1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/468—Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
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- This application relates to the field of power supplies, and in particular to a fast-start chip power supply.
- hot-plug supported When the chip is powered on, the hot-swap demand will cause the off-chip power supply to rise very quickly, usually up to 5 ⁇ s. In the traditional power management design, such a high-speed rise of the external power supply will cause the withstand voltage of the internal power output stage power tube device to be too high during the power-up process, thereby seriously reducing the service life of the device and the chip.
- the core function of a common traditional structure power management scheme is to use a 5V power supply outside the chip to generate a 3.3V power supply inside the chip.
- the functional modules are, band gap reference source, error amplifier, power output stage power tube, feedback resistor, and decoupling capacitor. Its working principle is that the bandgap reference source module is used to generate a stable reference voltage. The stable reference voltage does not change with changes in temperature and external power supply, and the accuracy can usually be within 10mV.
- a linear regulated power supply is formed by the error amplifier, power tube, feedback resistance and decoupling capacitor, etc., thereby obtaining the 3.3V power supply inside the chip.
- the external power supply can rise up to 5 ⁇ s.
- the bandgap reference module cannot be established in such a short period of time. Therefore, for the power tube, the drain-source voltage difference Vds will be as high as 5V, which is significantly higher than its safe voltage of 3.3V, thus making its withstand voltage too high and seriously shortening the The service life of the device eventually leads to a reduction in the service life of the entire chip.
- the present application provides a fast startup chip power supply to solve the problems of slow startup speed and short life of the existing startup power supply circuit.
- An embodiment of the present application provides a fast-start chip power supply, which includes a bandgap reference source, and is further characterized by a start-up path, a counter, and a multiplexer selector; the start-up path includes a first resistor and a second resistor, and the first A resistor is connected to an external power source, one end of the second resistor is connected to the first resistor, and the other end is grounded.
- the first resistor and the second resistor form a series voltage divider circuit;
- the bandgap reference source is used to generate a stable reference voltage, Connected to the counter;
- the counter after reaching the programmed delay time, generates a switching signal and outputs it to the switching path of the multiplexer selector;
- the first path of the multiplexer is connected in series with the start path Divide the voltage, the second channel is connected to the bandgap reference source voltage, and the switching switch channel selects the channel voltage according to the switching signal and outputs it to the power supply object.
- the fast start path and the multiplexer are added to generate a temporary reference voltage, which is provided to the linear regulated power supply.
- Figure 1 is a schematic diagram of the initial voltage timing of traditional chip power supply
- FIG. 2 is a schematic structural diagram of a fast-start chip power supply provided by an embodiment of the present application
- FIG. 3 is a schematic diagram of the power supply voltage sequence of the quick start chip provided by an embodiment of the present application.
- FIG. 1 is a schematic diagram of the initial voltage timing sequence of the conventional chip power supply.
- the voltage rise rate can be as high as 5 ⁇ s.
- the bandgap reference source module cannot be established in such a short period of time.
- the external voltage has risen to 5V, but the stable reference voltage cannot be established, and the power supply target voltage cannot rise. Therefore, for the power tube in the linear regulated power supply, the drain-to-source voltage difference will be as high as 5V, which is significantly higher than its safe voltage of 3.3V, which makes its withstand voltage too high (seriously shortens the service life of the device and eventually leads to the entire chip The reduction of the service life.
- FIG. 2 is a schematic structural diagram of a fast-start chip power supply according to an embodiment of the present application. It includes a bandgap reference source 1, which is characterized in that it also includes a start-up path 2, a counter 3, and a multiplexer selector 4; the start-up path 2 includes a first resistance and a second resistance, and the first resistance is connected to an external power supply. One end of the second resistor is connected to the first resistor and the other end is grounded.
- the first resistor and the second resistor form a series voltage divider circuit;
- the bandgap reference source 1 is used to generate a stable reference voltage and is connected to the counter 3
- the counter 3 after reaching the programmed delay time, generates a switching signal and outputs it to the complex selector 4 to switch the switching path;
- the complex selector 4 first path is connected to the start-up path 2 to generate a series of points Voltage, the second path is connected to the bandgap reference source voltage 1, the switching switch path selects the path voltage according to the switching signal, and outputs to the power supply object.
- the counter is embedded in a band gap reference source.
- the multiplexer is a 2-on-1 multiplexer.
- the power supply object of this embodiment is a linear regulated power supply, which requires a stable voltage of 3.3V, and the external power supply voltage is 5V.
- the bandgap reference source internally merges A stable reference voltage cannot be generated immediately, and a certain settling time is required.
- the starting path can be synchronized with an external power supply to generate a reference voltage of 1.2V after being divided according to the series voltage-dividing circuit, and then sent to the linear regulated power supply through the first path of the multiplexer to provide a temporary reference for it Voltage.
- a stable reference voltage can be output, and after the counter reaches the programmed delay time, the switching signal generated by the counter is sent to the multiplexer selector, at which time the multiplexer selector selects the second channel band
- the stable reference voltage generated by the gap reference source is output to the linear regulated power supply.
- the setting time of the counter is determined according to the time required for the bandgap reference source to establish a stable output voltage.
- the magnitude of the series voltage divider in the fast start path can be designed according to the actual voltage required by the power supply object.
- fast-start chip power supply provided by this application, as a new power management architecture, can also be used for other products that need to provide a stable voltage.
- FIG. 3 is a schematic diagram of the power supply voltage sequence of the quick start chip provided by an embodiment of the present application.
- the fast start path series voltage divider circuit shown in Figure 2 can generate a voltage of 1.2V synchronously and provide it to the linear regulated power supply for temporary use; at this time, in During the AB and BC periods, the bandgap reference source continues to generate a stable reference voltage.
- the multiplexer turns on the second channel, the bandgap reference source voltage, and provides it to the linear regulated power supply. .
- the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware, but in many cases the former is a better implementation the way.
- the technical solution of the present invention can be embodied in the form of a software product in essence or part that contributes to the existing technology.
- the computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, personal computer, server, or network device, etc.) executes the methods described in the embodiments of the present invention.
Abstract
A fast-start chip power supply, comprising a bandgap reference source (1), a startup path (2), a counter (3), and a multi-path selector (4). The startup path (2) comprises a first resistor and a second resistor, the first resistor is connected to an external power supply, one end of the second resistor is connected to the first resistor and the other end thereof is grounded, and the first resistor and the second resistor form a series voltage dividing circuit; the bandgap reference source (1) is used for generating a stable reference voltage, and is connected to the counter (3); after reaching a programmed delay time, the counter (3) generates a switching signal, and outputs same to a switching switch path of the multi-path selector (4); a first path of the multi-path selector (4) is connected to a series divided voltage generated by the startup path (2), a second path is connected to the voltage of the bandgap reference source (1), and the switching switch path selects a path voltage according to the switching signal and outputs the path voltage to a power supply object. The power supply reduces a drain-source voltage difference of a linear voltage stabilizing power supply output level power tube, prolongs the service life thereof, and improves the service life of the whole chip.
Description
本申请要求于2018年11月26日提交中国国家知识产权局、申请号为201811415759.0、发明名称为“一种快速启动芯片电源”的中国专利申请的优先权，该在先申请的全部内容通过引用结合在本申请中。This application requires the priority of the Chinese patent application submitted to the State Intellectual Property Office of China on November 26, 2018 with the application number 201811415759.0 and the invention titled "a fast-start chip power supply". The entire content of the previous application is cited by reference Incorporated in this application.
本申请涉及电源领域，尤其涉及一种快速启动芯片电源。This application relates to the field of power supplies, and in particular to a fast-start chip power supply.
现在很多电子产品都需要支持热插拔(hot-plug supported)。芯片上电时，热插拔的需求会导致芯片外电源上升速度非常快，通常可以达到5μs。在传统电源管理设计中，如此高速的外部电源上升速度，会导致上电过程中，内部电源输出级功率管器件耐压过高，从而严重减少该器件与芯片的使用寿命。Now many electronic products need to support hot plug (hot-plug supported). When the chip is powered on, the hot-swap demand will cause the off-chip power supply to rise very quickly, usually up to 5 μs. In the traditional power management design, such a high-speed rise of the external power supply will cause the withstand voltage of the internal power output stage power tube device to be too high during the power-up process, thereby seriously reducing the service life of the device and the chip.
常见的传统结构的电源管理方案，其核心功能是用芯片外部5V电源，产生芯片内部3.3V电源。功能模块有，带隙基准源，误差放大器，电源输出级功率管，反馈电阻，以及解耦电容等。其工作原理为，带隙基准源模块用于产生稳定参考电压，稳定参考电压不随温度和外部电源的变化而变化，精度通常可以做到10mV以内。接着，由误差放大器，功率管，反馈电阻和解耦电容等构成线性稳压电源，从而得到芯片内部3.3V电源。The core function of a common traditional structure power management scheme is to use a 5V power supply outside the chip to generate a 3.3V power supply inside the chip. The functional modules are, band gap reference source, error amplifier, power output stage power tube, feedback resistor, and decoupling capacitor. Its working principle is that the bandgap reference source module is used to generate a stable reference voltage. The stable reference voltage does not change with changes in temperature and external power supply, and the accuracy can usually be within 10mV. Next, a linear regulated power supply is formed by the error amplifier, power tube, feedback resistance and decoupling capacitor, etc., thereby obtaining the 3.3V power supply inside the chip.
在支持热插拔的应用中，芯片上电时，外部电源上升速度可以高达5μs。带隙基准模块无法在如此短暂的时间内完成建立，因此，对于功率管，其漏源压差Vds会高达5V，严重高于其安全电压3.3V，从而使其耐压过高，严重缩短该器件的使用寿命，最终导致整个芯片的使用寿命的减少。In applications that support hot swapping, when the chip is powered on, the external power supply can rise up to 5 μs. The bandgap reference module cannot be established in such a short period of time. Therefore, for the power tube, the drain-source voltage difference Vds will be as high as 5V, which is significantly higher than its safe voltage of 3.3V, thus making its withstand voltage too high and seriously shortening the The service life of the device eventually leads to a reduction in the service life of the entire chip.
发明内容Summary of the invention
有鉴于此，本申请提供一种快速启动芯片电源，解决现有启动电源电路启动速度慢和寿命短的问题。In view of this, the present application provides a fast startup chip power supply to solve the problems of slow startup speed and short life of the existing startup power supply circuit.
本申请实施例提供一种快速启动芯片电源，包括带隙基准源，其特征在于，还包括启动通路、计数器和复路选择器；所述启动通路包括第一电阻和第二电阻，所述第一电阻与外部电源连接，所述第二电阻一端与第一电阻连接，另一端接地，第一电阻与第二电阻组成串联分压电路；所述带隙基准源，用于产生稳定参考电压，与所述计数器连接；所述计数器，达到编程设计的延迟时间后，产生切换信号，输出至所述复路选择器切换开关通路；所述复路选择器第一通路接入启动通路产生的串联分压电压，第二通路接入所述带隙基准源电压，所述切换开关通路根据所述切换信号选择通路电压，输出至供电对象。An embodiment of the present application provides a fast-start chip power supply, which includes a bandgap reference source, and is further characterized by a start-up path, a counter, and a multiplexer selector; the start-up path includes a first resistor and a second resistor, and the first A resistor is connected to an external power source, one end of the second resistor is connected to the first resistor, and the other end is grounded. The first resistor and the second resistor form a series voltage divider circuit; the bandgap reference source is used to generate a stable reference voltage, Connected to the counter; the counter, after reaching the programmed delay time, generates a switching signal and outputs it to the switching path of the multiplexer selector; the first path of the multiplexer is connected in series with the start path Divide the voltage, the second channel is connected to the bandgap reference source voltage, and the switching switch channel selects the channel voltage according to the switching signal and outputs it to the power supply object.
本申请实施例采用的上述技术方案能够达到以下有益效果：在支持热插拔的芯片电源应用中，加入快速启动通路和复路选择器，产生临时基准电压，提供给线性稳压电源，弥补了带隙基准模块无法在短时间内提供基准电压的问题。同时，降低了线性稳压电源中输出级功率管漏源压差，延长该器件使用寿命，从而提高整个芯片的使用寿命。The above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: In the application of hot-swappable chip power supply, the fast start path and the multiplexer are added to generate a temporary reference voltage, which is provided to the linear regulated power supply. The problem that the bandgap reference module cannot provide the reference voltage in a short time. At the same time, it reduces the drain-source voltage difference of the output stage power tube in the linear regulated power supply, prolongs the service life of the device, and thus increases the service life of the entire chip.
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an undue limitation on the present application. In the drawings:
图1为传统芯片电源供电初期电压时序示意图；Figure 1 is a schematic diagram of the initial voltage timing of traditional chip power supply;
图2为本申请实施例提供的一种快速启动芯片电源结构示意图；FIG. 2 is a schematic structural diagram of a fast-start chip power supply provided by an embodiment of the present application;
图3为本申请实施例提供的快速启动芯片电源电压时序示意图。FIG. 3 is a schematic diagram of the power supply voltage sequence of the quick start chip provided by an embodiment of the present application.
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请具体实施例及相应的附图对本申请技术方案进行清楚、完整地描述。显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施 例，都属于本申请保护的范围。In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described clearly and completely in conjunction with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
以下结合附图，详细说明本申请各实施例提供的技术方案。The technical solutions provided by the embodiments of the present application will be described in detail below in conjunction with the drawings.
图1为传统芯片电源供电初期电压时序示意图。FIG. 1 is a schematic diagram of the initial voltage timing sequence of the conventional chip power supply.
在支持热插拔的应用中，芯片接通外部电源后，电压上升速度可以高达5μs。带隙基准源模块无法在如此短暂的时间内完成建立，如图2所示，在AB时间段，外部电压已经上升到5V，但由于稳定参考电压无法完成建立，供电对象电压也无法上升起来。因此，对于线性稳压电源中的功率管，其漏源压差会高达5V，严重高于其安全电压3.3V，从而使其耐压过高(严重缩短该器件的使用寿命，最终导致整个芯片的使用寿命的减少。In applications that support hot swapping, after the chip is connected to an external power supply, the voltage rise rate can be as high as 5 μs. The bandgap reference source module cannot be established in such a short period of time. As shown in Figure 2, during the AB period, the external voltage has risen to 5V, but the stable reference voltage cannot be established, and the power supply target voltage cannot rise. Therefore, for the power tube in the linear regulated power supply, the drain-to-source voltage difference will be as high as 5V, which is significantly higher than its safe voltage of 3.3V, which makes its withstand voltage too high (seriously shortens the service life of the device and eventually leads to the entire chip The reduction of the service life.
图2为本申请实施例提供的一种快速启动芯片电源结构示意图。包括带隙基准源1，其特征在于，还包括启动通路2、计数器3和复路选择器4；所述启动通路2包括第一电阻和第二电阻，所述第一电阻与外部电源连接，所述第二电阻一端与第一电阻连接，另一端接地，第一电阻与第二电阻组成串联分压电路；所述带隙基准源1，用于产生稳定参考电压，与所述计数器3连接；所述计数器3，达到编程设计的延迟时间后，产生切换信号，输出至所述复路选择器4切换开关通路；所述复路选择器4第一通路接入启动通路2产生的串联分压电压，第二通路接入所述带隙基准源电压1，所述切换开关通路根据所述切换信号选择通路电压，输出至供电对象。FIG. 2 is a schematic structural diagram of a fast-start chip power supply according to an embodiment of the present application. It includes a bandgap reference source 1, which is characterized in that it also includes a start-up path 2, a counter 3, and a multiplexer selector 4; the start-up path 2 includes a first resistance and a second resistance, and the first resistance is connected to an external power supply. One end of the second resistor is connected to the first resistor and the other end is grounded. The first resistor and the second resistor form a series voltage divider circuit; the bandgap reference source 1 is used to generate a stable reference voltage and is connected to the counter 3 The counter 3, after reaching the programmed delay time, generates a switching signal and outputs it to the complex selector 4 to switch the switching path; the complex selector 4 first path is connected to the start-up path 2 to generate a series of points Voltage, the second path is connected to the bandgap reference source voltage 1, the switching switch path selects the path voltage according to the switching signal, and outputs to the power supply object.
优选地，所述计数器嵌入带隙基准源。Preferably, the counter is embedded in a band gap reference source.
进一步地，所述复路选择器为2选1复路选择器。Further, the multiplexer is a 2-on-1 multiplexer.
例如，本实施例供电对象为线性稳压电源，需要3.3V稳定电压，外部电源电压为5V，当外部电压在极短时间内(比如5μs)上升至5V后，所述带隙基准源内部并不能立即产生稳定参考电压，需要一定建立时间。此时，所述启动通路，根据串联分压电路分压后，可以与外部电源同步产生一个基准电压1.2V，经复路选择器第一通路输送至线性稳压电源，为其提供临时的基准电压。 当带隙基准源内部电路建立完全，可以输出稳定参考电压，且计数器达到编程设计的延迟时间后，由计数器产生切换信号送达至复路选择器，此时复路选择器选择第二通路带隙基准源产生的稳定参考电压，并输出至线性稳压电源。For example, the power supply object of this embodiment is a linear regulated power supply, which requires a stable voltage of 3.3V, and the external power supply voltage is 5V. When the external voltage rises to 5V in a very short time (such as 5μs), the bandgap reference source internally merges A stable reference voltage cannot be generated immediately, and a certain settling time is required. At this time, the starting path can be synchronized with an external power supply to generate a reference voltage of 1.2V after being divided according to the series voltage-dividing circuit, and then sent to the linear regulated power supply through the first path of the multiplexer to provide a temporary reference for it Voltage. When the internal circuit of the bandgap reference source is completely established, a stable reference voltage can be output, and after the counter reaches the programmed delay time, the switching signal generated by the counter is sent to the multiplexer selector, at which time the multiplexer selector selects the second channel band The stable reference voltage generated by the gap reference source is output to the linear regulated power supply.
需要说明的是，所述计数器的设定时间，根据所述带隙基准源建立稳定输出电压所需时间确定。实际应用中，快速启动通路中的串联分压电压大小，可根据供电对象所需的实际电压大小来设计。It should be noted that the setting time of the counter is determined according to the time required for the bandgap reference source to establish a stable output voltage. In practical applications, the magnitude of the series voltage divider in the fast start path can be designed according to the actual voltage required by the power supply object.
需要说明的是，本申请实施提供的快速启动芯片电源，作为一种新的电源管理架构，也可以用于其他需要提供稳定电压的产品。It should be noted that the fast-start chip power supply provided by this application, as a new power management architecture, can also be used for other products that need to provide a stable voltage.
图3为本申请实施例提供的快速启动芯片电源电压时序示意图。FIG. 3 is a schematic diagram of the power supply voltage sequence of the quick start chip provided by an embodiment of the present application.
与图1主要区别在于，在外部电压快速上升到5V时，图2所示的快速启动通路串联分压电路，可以同步产生一个电压1.2V，提供给线性稳压电源临时使用；此时，在AB和BC时间段，带隙基准源继续产生稳定参考电压，当稳定参考电压在C时刻建立完成后，复路选择器接通第二通路，即带隙基准源电压，提供给线性稳压电源。The main difference from Figure 1 is that when the external voltage rises rapidly to 5V, the fast start path series voltage divider circuit shown in Figure 2 can generate a voltage of 1.2V synchronously and provide it to the linear regulated power supply for temporary use; at this time, in During the AB and BC periods, the bandgap reference source continues to generate a stable reference voltage. When the stable reference voltage is established at time C, the multiplexer turns on the second channel, the bandgap reference source voltage, and provides it to the linear regulated power supply. .
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到本发明可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台终端设备(可以是手机，个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述的方法。Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware, but in many cases the former is a better implementation the way. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or part that contributes to the existing technology. The computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, personal computer, server, or network device, etc.) executes the methods described in the embodiments of the present invention.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视本发明的保护范围。The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and retouches can be made. These improvements and retouches also It should be regarded as the protection scope of the present invention.
Claims (3)
- 一种快速启动芯片电源，包括带隙基准源，其特征在于，还包括启动通路、计数器和复路选择器；A fast start chip power supply, including a bandgap reference source, characterized in that it also includes a start path, a counter and a multiplex selector;所述启动通路包括第一电阻和第二电阻，所述第一电阻与外部电源连接，所述第二电阻一端与第一电阻连接，另一端接地，第一电阻与第二电阻组成串联分压电路；The starting path includes a first resistor and a second resistor, the first resistor is connected to an external power source, one end of the second resistor is connected to the first resistor, the other end is grounded, and the first resistor and the second resistor form a series voltage divider Circuit所述带隙基准源，用于产生稳定参考电压，与所述计数器连接；The bandgap reference source is used to generate a stable reference voltage and is connected to the counter;所述计数器，达到编程设计的延迟时间后，产生切换信号，输出至所述复路选择器切换开关通路；After reaching the programmed delay time, the counter generates a switching signal and outputs it to the switching path of the multiplexer selector;所述复路选择器第一通路接入所述启动通路产生的串联分压电压，第二通路接入所述带隙基准源电压，所述切换开关通路根据所述切换信号选择通路电压，输出至供电对象。The first path of the multiplexer is connected to the series divided voltage generated by the start path, and the second path is connected to the bandgap reference source voltage. The switching switch path selects the path voltage according to the switching signal and outputs To the power supply object.
- 如权利要求1所述快速启动芯片电源，其特征在于，所述计数器嵌入带隙基准源。The fast-start chip power supply according to claim 1, wherein the counter is embedded in a band gap reference source.
- 如权利要求1所述快速启动芯片电源，其特征在于，所述复路选择器为2选1复路选择器。The fast-start chip power supply according to claim 1, wherein the multiplexer is a 2-on-1 multiplexer.
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| CN115454191B (en) * | 2022-10-08 | 2023-09-29 | 武汉杰开科技有限公司 | Overshoot protection circuit, method and chip |
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