摘要
本文提出并实现了一种面向电流模式单片开关DC/DC转换器的低压高效片上电流采样电路.该电路利用功率管等效电阻电流检测技术和无需OP放大器的源极输入差分电压放大技术,使电路的应用范围可低达2.3V;-3dB带宽12MHz;在最大负载电流情况下的静态电流峰值仅19μA,比常规采用功率管镜像电流检测技术的静态电流峰值低1.5个量级左右.转换器基于0.5μm 2P3M Mixed Signal CMOS工艺设计制作.测试结果表明,电流检测电路的最大检测电流1.1A,转换器的输入最低电压2.3V,重负载转换效率高于93%.
In this paper, A kind of low-voltage high-efficient on-chip current sensing circuit for monolithic current- mode switch DC/DC converter is proposed. The circuit makes use of power transistor equivalent resistor current sensing technique and source-input differential voltage amplification technique. As a result, the power supply range can be as low as 2. 3V, -- 3dB bandwidth is up to 12 MHz and the quiescent current peak is only 19~A under maximum load current, which is about I. 5 orders lower than the quiescent current peak using traditional power transistor mirror-current sensing. The converter is designed and fabricated in 0.5~tm 2P3M Mixed Signal CMOS process. The test results show that the maximum sensing current of 1.1A, minimum power supply voltage of the converter is 2.3V, the conversion efficiency is higher than 93% under heavy load.
出处
《微电子学与计算机》
CSCD
北大核心
2012年第10期55-59,共5页
Microelectronics & Computer
