【摘要】 设计了一种降压式PWM/PFM自动切换的同步整流DC-DC变换器芯片,对其结构原理进行了分析,并用0.5μm n阱CMOS工艺进行模拟验证。Hspice模拟结果表明在输出负载电流为1mA,输入电源电压为3.6V,温度为25℃时,纹波电压为10mV,静态电流只有56.7μA,而待机工作模式下静态电流小于0.01μA,效率高达90%。体现其具有低功耗、低纹波、高效率的优点,且该变换器可工作在2~6V电源电压范围,可应用于各种便携式电子产品中。更多还原

【Abstract】 The paper proposed a synchronous step-down DC-DC converter with PWM/PFM switching control.The structure and principles were analyzed and simulated by using 0.5 μm n-well CMOS process.The Hspice simulation results show that the typical ripple voltage is 10mV,and the typical quiescent current is only 56.7 μA,but quiescent current is less than 0.01 μA in standby mode,efficiency achieves up to 90% at 1mA when power supply is 3.6 V and temperature is 25 ℃,which imply it has an advantage of low power dissipation,low ripple voltage and high efficiency.The converter has a wide range of power supply from 2 V to 6 V,and it can be used for portable electronics.更多还原