Title :
Design of hysteretic buck converter with a low output ripple voltage and a fixed switching frequency in CCM
Author :
Tae-Jin Jeong ; Woo-Seong Kang ; Ji-San Choi ; Goang-Seob Yoon
Author_Institution :
Coll. of Electron. Eng., INHA Univ., Incheon, South Korea
Abstract :
An efficient fast response hysteretic buck converter suitable for mobile application is proposed. The problems of large output ripple and difficulty in using of small power inductor that conventional hysteretic converter has is improved by adding PLL (Phase Locked Loop) structure. The circuits are implemented by using Dongbu 0.35um BCDMOS process. The settling time of charge pump output is less than 6us and output voltage overshoot is 21mV when load current changes from 50mA to 500mA. The efficiency is 90~95% under 50~500mA load condition and output voltage is 1.2mV with 5.5mV ripple voltage.
Keywords :
BIMOS integrated circuits; charge pump circuits; integrated circuit design; phase locked loops; power convertors; power inductors; CCM; Dongbu BCDMOS process; PLL; charge pump; current 50 mA to 500 mA; efficiency 90 percent to 95 percent; fixed switching frequency; hysteretic buck converter; low output ripple voltage; mobile application; phase locked loop; power inductor; size 0.35 mum; voltage 1.2 mV; voltage 21 mV; voltage 5.5 mV; Capacitors; Frequency control; Inductors; Mobile communication; Transient analysis; Voltage control; delay time control circuit; hysteretic buck converter; ramp generator; switching frequency;
Conference_Titel :
SoC Design Conference (ISOCC), 2014 International
DOI :
10.1109/ISOCC.2014.7087624
