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本文提出了一种基于事件驱动控制的数字低压差稳压器（LDO），实现了完全集成的100pF输出电容，在0.5V输入电压下提供1.44mA级别的负载电流。该设计通过事件驱动方案大幅降低了输出电容需求，避免了传统高频数字LDO的功率效率问题。
SK hynix, Icheon, Korea 1 2 In today’s system-on-chip designs, a low-drop-out voltage regulator (LDO) is one of the most popular choices to create a distinct voltage domain owing to its high power density. Many LDOs, however, need a large output capacitor (COUT) to compensate a fast load current (ILOAD) change, increasing the number of pins and off-chip components. In synchronous digital LDO designs, high frequency can miniaturize COUT, but it inevitably causes power inefficiency [2]. A recent work has instead employed an event-driven (ED) control scheme to alleviate the COUT requirement, demonstrating a 400μA-class digital LDO with a COUT of 400pF [1]. The ED scheme is promising, but it is still desirable to develop an LDO which can support a larger ILOAD with a smaller COUT. This is indeed a daunting challenge since a substantial reduction in feedback latency (TLAT) is necessary to retain the same
Doyun Kim1, Jonghwan Kim2, Hyunju Ham2, Mingoo Seok1
Columbia University, New York, NY