Sub-1V Input Single-Inductor Dual-Output (SIDO) DC-DC Converter with Adaptive Load-Tracking Control (ALTC) for Single-Cell-Powered System

• Main Authors: Tsai, Yu-Nung, 蔡裕農
• Other Authors: Chen, Ke-Horng
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/17065095024071529884

碩士 === 國立交通大學 === 電機與控制工程系所 === 97 === In this paper, a sub-1V input single-inductor dual-output (SIDO) DC-DC converter with an adaptive load-tracking control (ALTC) technology is proposed for single-cell-powered portable devices. Through the minimized number of switch and the optimum current sequence, the ALTC technique adaptively and accurately adjusts storage energy in form of inductor current according to the actual load condition without wasting surplus charge and increasing cross-regulation. Moreover, a current-mode ring oscillator with a self-bias current source (SBCS) circuit is proposed to replace the conventional startup ring oscillator to produce a nearly constant system clock. Owing to the proposed current-mode ring oscillator operates in the startup process and steady-state of SIDO DC-DC converter, a simplified design efficiently addresses high switching frequency losses at startup process and reduces chip area and power consumption. The proposed sub-1V input SIDO DC-DC converter was fabricated by TSMC 0.25 μm 2.5 V/5 V BCD process and the experimental results show a high efficiency of 92 % and a good cross-cross regulation smaller than 10 mV.