半导体学报2012，Vol.33Issue(1)：86-92,7.DOI:10.1088/1674-4926/33/1/015002
A 1500 mA, 10 MHz on-time controlled buck converter with ripple corapensation and efficiency optimization
A 1500 mA, 10 MHz on-time controlled buck converter with ripple corapensation and efficiency optimization
Yu Jiale 1Lü Danzhu 1Hong Zhiliang1
作者信息
- 1. State Key Laboratory ofASIC & System, Fudan University, Shanghai 201203, China
- 折叠
摘要
Abstract
A 1500 mA,10 MHz self-adaptive on-time (SOT) controlled buck DC-DC converter is presented.Both a low-cost ripple compensation scheme (RCS) and a self-adaptive on-time generator (SAOTG) are proposed to solve the system stability and frequency variation problem.Meanwhile a self-adaptive power transistor sizing (SAPTS)technique is used to optimize the efficiency especially with a heavy load.The circuit is implemented in a 2P4M 0.35 μm CMOS process.A small external inductor of 0.47 μH and a capacitor of 4.7 μF are used to lower the cost of the converter and keep the output ripple to less than 10 mV.The measurement results show that the overshoot of the load transient response is 8 mV @ 200 mA step and the dynamic voltage scaling (DVS) performance is a rise of 16 μs/V and a fall of 20μs/V.With a SAPTS technique and PFM control,the efficiency is maintained at more than 81% for a load range of 20 to 1 500 mA and the peak efficiency reaches 88.43%.关键词
buck converter/high frequency/large current load/efficiency/on-time controlKey words
buck converter/high frequency/large current load/efficiency/on-time control引用本文复制引用
Yu Jiale,Lü Danzhu,Hong Zhiliang..A 1500 mA, 10 MHz on-time controlled buck converter with ripple corapensation and efficiency optimization[J].半导体学报,2012,33(1):86-92,7.
