Active hot plug input protection circuit
A protection circuit, hot-swap technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve the unfavorable development trend of integrated circuit miniaturization and large chip area. , peripheral complexity and other issues, to simplify the peripheral protection circuit, miniaturize the package, achieve the effect of safety and cost
Inactive Publication Date: 2021-12-28
江苏长晶科技股份有限公司
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Benefits of technology
The technical effects are that this new protective circuit has several benefits compared to previous designs such as being able to effectively prevent damage from external sources like lightning or electrostatic discharge (ESD). It also allows for efficient cool down during testing due to its low resistance values at both ends. This makes it suitable for smaller packages and reduces costs associated therewith.
Problems solved by technology
This patented technical problem addressed in this patents relates to improving the performance of semiconductor devices during operation without causing harm due to overheated conditions caused by repeated thermal loading (hot-spik). Existing solutions such as adding extra components like thermally stable materials have limitations because they may increase resistance while also reducing efficiency when trying to protect against these types of heat events.
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[0019] Such as Figure 4 , the protection object is the hot-swappable input protection circuit of the low-voltage circuit, including the low-voltage electrostatic protection module ESD1, the low-voltage PMOS transistor LP, the low-voltage NMOS transistor LN, the resistors R1 and R2, and the low-voltage capacitor C1; the negative terminal of the low-voltage electrostatic protection module ESD1, the resistor R1 One end of the low-voltage PMOS transistor LP, the source and the substrate of the low-voltage NMOS transistor LN, and the power supply end of the low-voltage circuit of the protected object are all connected to the input power supply VIN, the positive end of the low-voltage electrostatic protection module ESD1, and the lower pole of the low-voltage capacitor C1 The plate, one end of resistor R2, the source and substrate of low-voltage NMOS transistor LN, and the grounding terminal of the low-voltage circuit of the protected object are all grounded, and the upper plate of ...
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The invention discloses an active hot plug input protection circuit which comprises a hot plug input protection circuit with a protection object being a low-voltage circuit and a hot plug input protection circuit with a protection object being a high-voltage circuit, the two protection circuits are the same in principle, only low-voltage components are adopted in one protection circuit, high-voltage components are adopted in the other protection circuit, and each of the two protection circuits comprises an RC time delay circuit and a power switch. By reasonably setting the control time of RC delay and matching with a switch tube with a dozens of ohms of on-resistance, when an input pin is powered on and the input end is hot-plugged, the RC delay circuit controls the protection circuit to be turned on within dozens of microseconds, the power-on peak is effectively discharged to the ground, and the situation that the potential of the input power pin exceeds a rated value is avoided.
Description
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