Integrated on-chip surge protection circuit

Abstract

The invention provides a surge protection circuit integrated in a chip. The surge protection circuit integrated in the chip comprises a main bleeder circuit and a quick detection circuit. The main bleeder circuit comprises a first diode, a second diode, a second resistor and a first MOS (metal oxide semiconductor) tube. A cathode of the first diode is connected with a power end, an anode of the first diode is grounded through the second resistor, and a node between the first diode and the second resistor is a first node. A first connection end of the first MOS tube is connected with the power end, a second connection end of the first MOS tube is grounded, and a control end is connected with the first node. The quick detection circuit comprises a capacitor, a first resistor, a third diode and a second MOS tube. The capacitor is connected between the power end and the third diode, an anode of the third diode is grounded, and a node between the third diode and the capacitor is a second node. A first connection end of the second MOS tube is connected with the power end, a second connection end of the second MOS tube is connected with the first node, and a control end is connected with the second node. Compared with the prior art, the surge protection circuit integrated in the chip has the advantage that surge protection of an internal circuit of the chip can be realized.

Description

【Technical field】 [0001] The invention relates to the field of circuit design, in particular to a surge protection circuit which can be integrated in a chip. 【Background technique】 [0002] Surge (Electrical surge) refers to the peak value of the power supply exceeding the stable value in an instant, which includes surge voltage and surge current. When the environment of the system input power supply is harsh, the input to the IC port will generate instantaneous surge voltage and current. If it cannot be released in time, it will cause serious damage to the IC product. The traditional anti-surge protection structure mainly uses an external TVS (Transient Voltage Suppressor) diode. Due to its special manufacturing process, it cannot be integrated on the chip, occupying the area of ​​the PCB board, and the layout and wiring are cumbersome. [0003] Therefore, it is necessary to develop a surge protection structure that can be integrated on a chip to solve the above problems. ...

AI Technical Summary

Problems solved by technology

When the system input power environment is harsh, the input to the IC port will generate instantaneous surge voltage and current. If it cannot be released in time, it will cause serious damage to the IC product.

The traditional anti-surge protection structure mainly uses an external TVS (Transient Voltage Suppressor) diode. Due to its special manufacturing process, it cannot be integrated on the chip, occupying the PCB board area, and the layout and wiring are cumbersome.

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