Fast-start chip power supply
A fast startup and chip technology, applied in the power supply field, can solve the problems of slow startup speed and short life of the startup power supply circuit, and achieve the effects of improving the service life, prolonging the service life, and reducing the drain-source voltage difference.
Inactive Publication Date: 2019-03-26
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology
[0005] In view of this, the present application provides a quick-start chip power supply, which solves the problems of slow start-up speed and short life of the existing start-up power supply circuit
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[0012] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0013] The technical solutions provided by various embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.
[0014] figure 1 Schematic diagram of the initial voltage sequence for the traditional chip power supply.
[0015] In applications that support hot swapping, after the chip is con...
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The invention discloses a fast-start chip power supply including a bandgap reference source, a startup path, a counter, and a reset selector. The startup path includes 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, the other end of the second resistor is grounded, and the firstresistor and the second resistor form a series voltage dividing circuit. The bandgap reference source is used for generating a stable reference voltage and is connected to the counter. After reachinga programmed delay time, the counter generates a switching signal and outputs the switching signal to a multiple-path selector to switch a switching path. A first path of the multiple-path selector isconnected to a series divided voltage generated by the startup path, a second path is connected to a bandgap reference source voltage, the switching switch path selects a path voltage according to the switching signal and outputs the path voltage to a power supply object. According to the invention, the drain and source voltage difference of a linear voltage stabilizing power supply output levelpower tube is reduced, the service life is prolonged, and the service life of the whole chip is improved.
Description
technical field [0001] This application relates to the field of power supplies, in particular to a quick-start chip power supply. Background technique [0002] Now many electronic products need to support hot-plug (hot-plug supported). When the chip is powered on, the demand for hot swap will cause the power supply outside the chip to rise very fast, usually up to 5μs. In the traditional power management design, such a high-speed external power supply rise rate will cause the internal power output stage power tube device to withstand a high voltage during power-on, which will seriously reduce the service life of the device and chip. [0003] The core function of the common power management scheme with traditional structure is to use the external 5V power supply of the chip to generate the internal 3.3V power supply of the chip. Functional modules include bandgap reference source, error amplifier, power supply output stage power tube, feedback resistor, and decoupling capac...
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Login to View More IPC IPC(8): G05F1/46
CPCG05F1/462G05F1/468
Inventor 王旭杨帆倪娜马玉林甄玉龙陈涛王悦张亮任居胜
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT