【摘要】 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。更多还原

【Abstract】 An integrated four NMOS power switch Buck-Boost DC-DC converter was proposed to improve the utilization 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 0.5μm BCD process technology. With a Spectre simulation results,this topology can get high efficiency and high power density,which is applicable to power system.更多还原