一种PWM/PFM自动切换的同步整流DC-DC芯片的设计  

The Design of a Synchronous DC/DC Converter with PWM/PFM Switching Control

作　　者：常昌远[1] 姚建楠[1] 邹一照[1] 谭春玲[1] 魏同立[1] 

机构地区：[1]东南大学微电子中心,江苏南京210096

出　　处：《通信电源技术》2007年第2期46-48,共3页Telecom Power Technology

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0．5μmn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25C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。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. 5μm 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 lmA 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.

关 键 词：DC—DC变换器 PWM/PFM自动切换 同步整流 高效率 

分 类 号：TM46[电气工程—电器]