JSSC 2020第3期Power ManagementLDO

A Dynamically High-Impedance Charge-Pump-Based LDO With Digital-LDO-Like Propert

提出一种基于动态高阻抗电荷泵的LDO，具有数字LDO特性，响应速度快且功耗低。

6.9ns响应时间/65ns稳定时间，4.9µA静态电流，<15mV输出纹波，1µA–105mA负载范围

电荷泵LDO高阻抗反馈事件驱动低功耗快速响应

▸创新点1：采用交流耦合高阻抗反馈环路（ACHZ），通过电容耦合实现高频信号的高阻抗传输，显著提升环路增益和相位裕度，使LDO在4.9µA静态电流下实现6.9ns的超快瞬态响应，属于电路创新。

▸创新点2：连续时间死区检测技术，通过实时监测误差信号幅值动态调整死区范围，避免传统数字LDO的量化误差问题，将稳定时间缩短至65ns，属于方法创新。

▸创新点3：事件驱动机制结合电荷泵架构，仅在负载瞬变时触发调节动作，相比传统时钟驱动方案降低动态功耗，同时支持1µA-105mA（105000倍）的超宽负载范围，属于系统级创新。

▸创新点4：融合数字LDO特性（工艺可移植性、低工作电压）与模拟LDO性能（低纹波<15mV），实现亚4-fs FoM的顶尖能效指标，属于跨域协同创新。

Abstract

This article presents an event-driven charge-pump- based low-dropout (LDO) regulator with an ac-coupled high- impedance (ACHZ) feedback loop. By using the ACHZ loop and continuous-time dead-zone detection, the proposed LDO responds in less than a clock cycle during load transients, achieving the response and settling times of 6.9 and 65 ns, respectively, all at a 4.9-µA quiescent current for a sub-4-fs FoM. The output ripple is measured to have a stable amplitude and is <15 mV over the LDO’s 105