一种基于四NOMS管升/降压DC-DC转换器的设计

Design of a Four-NOMS-Switch Buck-Boost DC-DC Converter

为提高电池能量的利用率,减小芯片体积,外围电路简易,设计了一种集成四NMOS功率管的升降压DC-DC转换器。该电路根据输入与输出电压的关系和负载大小,采用不同的工作模式,利用充电泵电路完成高端功率管驱动及延时检测实现短路保护,并在0.5BCD工艺下完成。通过仿真验证了该系统的可行性,转换效率可达、以及宽输入范围下提供稳定的输出电压。

An integrated four NMOS power switch Buck-Boost DC-DC converter was proposed to improve the uti- lization efficiency of batteries, extend life of batteries and facilitate integration in internal of chip. Then , the driver of power tube and shorted circuit protection and detection were analyzed. At last, the topology designed an Spectresimulation in 0.5μmBCD process technology. With a Spectre simulation results, this topology can get high efficiency and high power density, which is applicable to power system.