Vertical type constant-current device with protective functions on three terminals and manufacturing method therefor

Abstract

The invention provides a vertical type constant-current device with protective functions on three terminals and a manufacturing method therefor. The vertical type constant-current device comprises a constant-current device structure and a bidirectional transient voltage suppressor diode structure which are integrated on the same silicon substrate; an N type doped substrate, a third P type heavily-doped region, a positive electrode and an N type doped epitaxial layer are shared by the constant-current device structure and the bidirectional transient voltage suppressor diode structure; the constant-current device structure also comprises a first diffusion P type well region, an N type heavily-doped region, a first P type heavily-doped region, an N type channel region, a first oxide layer and a first metal negative electrode; and the bidirectional transient voltage suppressor diode structure also comprises a second P type heavily-doped region, a second oxide layer and a second metal negative electrode. According to the vertical type constant-current device, the bidirectional transient voltage suppressor diode and the constant-current device are integrated together, so that the constant-current device is endowed with certain surge handling capability, thereby improving the reliability of the constant-current device and a system formed by the constant-current device, and greatly reducing the area.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, and in particular relates to a vertical constant current device with three terminals with built-in protection functions and a manufacturing method thereof. Background technique [0002] The constant current source is a commonly used electronic equipment and device, and it is widely used in electronic circuits. The constant current source is used to protect the entire circuit, even if the voltage is unstable or the load resistance changes greatly, it can ensure the stability of the supply current. A constant current diode (CRD, Current Regulative Diode) is a semiconductor constant current device, which uses a two-terminal junction field effect transistor as a constant current source instead of an ordinary constant current composed of multiple components such as transistors, voltage regulator tubes, and resistors. The source can maintain a constant current value within a certain working ran...

AI Technical Summary

Problems solved by technology

However, the current constant-current devices cannot cope with the harsh external environment. It is easy to burn out in the case of lightning strikes or large voltages and high currents generated by grid fluctuations, which makes it difficult to guarantee the safety of subsequent drive circuits. In constant-current devices After the peripheral integrated transient voltage suppressor diode (TVS, Transient Voltage Suppressor), the anti-surge capability of the constant current device and the entire drive system can be enhanced, and the reliability is greatly improved

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