All Digitally controlled boost dc-dc converter with digitally delay lock loop based calibration

• Main Authors: Jen Hou Wu, 吳仁豪
• Other Authors: S. K. Kao
• Format: Others
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/00526682974182760397

碩士 === 長庚大學 === 電機工程學系 === 101 === The supply voltage of most electronic products is origin by Li-on battery or Ni-Mh battery in portable electronic product. But for some specific circuits, their supply voltage must be higher than normal supply voltage such as digital camera, LED driver, and USB OTG, etc. But if we cascade several Li-on batteries, it will conflict our original design concept. Therefore, a boost DC-DC converter is adopted here for produce higher supply voltage. This thesis presents the high accuracy all digital controlled boost converter with phase calibration. We propose some novel circuits: ramp generator realizes in digital approach for coarse tuning and DPWM with build-in delay-locked loop (DLL) for phase calibration to enhance the resolution. This circuit is designed in 0.35 m CMOS process. Expected specifications: the input voltage range is from 3.3V to 4.2V with output voltage of 5V. The maximum loading current is 500 mA for 5V. The peak efficiency of the switching converter is up to 99%.