A Fully Synchronous Digital LDO with Built-In Adaptive Frequency Modulation and Implicit Dead-Zone Control

This paper proposes a synchronous digital LDO with adaptive clocking and dead-zone control without additional reference voltages. A test chip fabricated in a commercial 65 nm CMOS general-purpose (GP) process achieves 580x frequency modulation with 99.9% maximum efficiency at 0.6V supply.