PLL-based charge control scheme for SIMO buck DC-DC converter

This paper presents a phase-locking-loop-based (PLL-based) charge control scheme to enhance the cross regulation (CR) performance of charge-controlled SIMO Buck DC-DC without freewheel period. By combining PLL structure with traditional scheme, each channel could be regulated by an independent loop. Moreover, gain-adapted pump (GACP) technique is applied for stability in multi-load condition. The multi-loop and CR expressions are derivated improve their relative performance. Experimental results show that proposed can achieve worst-case 0.052mV/mA 384mA load transient, 0.038mV/mA 150mA transient at least 43.2% improvement above existing schemes.