Capacitor and power integrated circuit

Abstract

The invention, which belongs to the field of the power device structure design, provides a capacitor and a power integrated circuit. A lower polar plate of the capacitor and a drain electrode of a field effect transistor share an active region and the lower polar plate of the capacitor and the drain electrode of the field effect transistor are electrically connected. The lower polar plate of the capacitor is a partial well region containing the drain electrode and an upper polar plate of the capacitor is a top metal corresponding to the partial well region containing the drain electrode of the field effect transistor. More particularly, the drain electrode of the field effect transistor employs an E-shaped layout mode; and the top metal as the upper polar plate is distributed at the sealing port end of the E-shaped layout of the drain electrode of the field effect transistor, so that the capacitor is integrated to the field effect transistor without increasing the size of the field effect transistor. If the field effect transistor integrated with the capacitor is applied to the power integrated circuit, the size of the existing power integrated circuit integrated with the capacitor can be reduced and the production cost can be lowered, so that the product popularization and application can be realized beneficially.

Description

technical field [0001] The invention belongs to the field of power device structure design, in particular to a capacitor and a power integrated circuit. Background technique [0002] In the field of drive circuit design, in order to reduce cost and size, power integrated circuits are often used to realize constant current / constant voltage drive control of loads. A power integrated circuit refers to a special integrated circuit that integrates power devices, low-voltage control circuits, signal processing, and communication interfaces into the same chip. The power device is the core part and occupies most of the chip area. In the constant current / constant voltage drive circuit provided by the prior art, the power integrated circuit uses an N-type lateral double diffused MOS (N Type Lateral Double Diffused MOS, NLDMOS) tube as the power device, and a capacitor C0 is set inside the power integrated circuit , one end of the capacitor C0 is connected to the drain pin of the NLDM...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a capacitor, aiming to solve the problem of large volume and high production cost of the power integrated circuit in the existing power integrated circuit, because the capacitor is externally connected to the NLDMOS tube.

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