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发明公开
CN1719706A 半导体装置、DC/DC变换器和电源系统 有权 转让 复审申请

半导体装置、DC/DC变换器和电源系统
摘要：
提供一种半导体装置、DC/DC变换器和电源系统，该半导体装置可防止自导通并能大幅度地提高电源变换效率。在把高端开关、低端开关、两个驱动器单封装化了的电源用封装中系统中，由于通过把辅助开关内装在低端开关的栅－源间，并在同一个芯片上构成该低端开关的低端MOSFET 3和辅助开关的辅助MOSFET 4，能够防止自导通，所以可以安装阈值电压低的低端MOSFET 3，电源变换效率大幅度地提高。而且，关于辅助MOSFET 4的栅驱动，通过利用高端MOSFET 2的驱动器，也不需要设置新的驱动电路，而且能够以与现有制品相同的管脚配置来实现，置换是容易的。
摘要（英）：

A semiconductor device in which the self-turn-on phenomenon is prevented that can significantly improve power conversion efficiency. The semiconductor device is a system-in-package for power supply applications in which a high-side switch, a low-side switch, and two drivers are included in a single package. The device includes an auxiliary switch disposed between the gate and source of said low-side switch, and a low-side MOSFET 3 for the low-side switch and an auxiliary MOSFET 4 for the auxiliary switch are disposed on the same chip. In this way, the self-turn-on phenomenon can be prevented, allowing the mounting of a low-side MOSFET 3 with a low threshold voltage and thereby significantly improving power conversion efficiency. The gate of the auxiliary MOSFET 4 is driven by the driver for the high-side MOSFET 2, thereby eliminating the need for a new drive circuit and realizing the same pin configuration as existing products, which facilitates easy replacement.

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