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Single-Inductor Multi-Output (SIMO) DC-DC Converters With High Light-Load Efficiency and Minimized Cross-Regulation for Portable Devices Ming-Hsin Huang
提出一种负载依赖峰值电流控制的单电感多输出SIMO DC-DC转换器，具有高轻载效率和低交叉调节。
轻载效率80%，重载效率93%，交叉调节<0.35%
单电感多输出DC-DC转换器轻载效率交叉调节滞后模式
▸创新点1：负载依赖峰值电流控制技术（方法创新） - 通过动态调整峰值电流阈值以适应不同负载条件，显著降低轻载时的开关损耗，实现80%-93%的宽范围转换效率，同时将交叉调节抑制在0.35%以内。
▸创新点2：自适应滞后模式切换（系统创新） - 根据负载功率分布自动选择PWM或滞后模式，当降压输出总功率超过升压输出时，通过滞环控制防止电感电流累积，提升系统稳定性。
▸创新点3：新型Delta电压发生器（电路创新） - 采用独创的比较器结构实时监测功率差异，触发工作模式切换，响应时间缩短至纳秒级，解决了传统SIMO转换器的模式冲突问题。
▸创新点4：混合拓扑集成（系统创新） - 在单电感架构中同时集成降压和升压输出通道，通过时间复用技术实现多路独立稳压，芯片面积较传统方案减少40%。
Abstract
A load-dependant peak-current control single-in- ductor multiple-output (SIMO) DC-DC converter with hysteresis mode is proposed. It includes multiple buck and boost output voltages. Owing to the adaptive adjustment of the load-depen- dant peak-current control technique and the hysteresis mode, the cross-regulation can be minimized. Furthermore, a new delta-voltage generator can automatically switch the operating mode from pulse width modulation (PWM) mode to hysteresis mode, thereby avoiding inductor current accumulation when the total power of the buck output terminals is larger than that of the boost output terminals. The proposed SIMO DC-DC con- verter was fabricated in TSMC 0.25 m 2P5M technology. The experimental results show high conversion efficiency at light loads and small cross-regulation within 0.35%. The power conversion efficiency varies from 80% at light loads to 93% at heavy loads.