14.6 A 745pA Hybrid Asynchronous Binary-Searching and Synchronous Linear-Searching Digital LDO with 3.8×105 Dynamic Load Range, 99.99% Current Efficiency, and 2mV Output Voltage Ripple
14.6 A 745pA Hybrid Asynchronous Binary-Searching and Synchronous Linear-Searching Digital LDO with 3.8×105 Dynamic Load Range, 99.99% Current Efficiency, and 2mV Output Voltage Ripple
复制标题
14.6A 745pA 混合异步二进制搜索和同步线性搜索数字 LDO，具有 3.8×105 动态负载范围、99.99% 电流效率和 2mV 输出电压纹波
DOI：
10.1109/isscc.2019.8662533
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
B. Calhoun
中科院分区：
文献类型：
--
作者：
Shuo Li;B. Calhoun
新兴的NW到MU物联网(IoT)片上(SoC)系统的电压调节器需要超低的静态功率来延长寿命，需要大的动态负载范围来支持多个组件和应用，并且需要快速的暂态性能来支持占空比负载。开关调节器[1]、[2]可以实现亚NW工作，但存在建立时间慢和输出电压纹波大的问题，这会降低模拟和射频性能。数字低压差稳压器(DLDO)具有更快的暂态响应、低电压运行和灵活的控制方案[3]-[6]。然而，传统的使用高频时钟进行快速响应的同步DLDO功耗太高[3]，而异步DLDO可以实现较低的电流消耗和快速响应，但存在较大的稳态误差[4]。此外，以前的DLDO不以$\lt 10\mU\mathm{A}$范围内的负载电流为目标。为了实现超低功耗、高达NA负载的宽动态负载范围以及良好的暂态和稳态性能，我们提出了一种混合式异步二分搜索(ABS)和同步线性搜索(SLS)DLDO，在静态电流消耗为745pA的同时，获得了3.8倍10^{5}$的动态负载范围、99.99%的电流效率和2 mV的输出电压纹波。
Voltage regulators for emerging nW-to-$\mu \mathrm {W}$ Internet-of-Things (IoT) systems-on-chip (SoCs) require ultra-low quiescent power to enhance lifetime, a large dynamic load range to support multiple components and applications, and fast transient performance to support duty-cycled loads. Switching regulators [1], [2] can achieve sub-nW operation, but suffer from slow settling time and large output voltage ripple that deteriorate analog and RF performance. Digital low-dropout regulators (DLDOs) offer faster transient response, low-voltage operation, and flexible control schemes [3]–[6]. However, conventional synchronous DLDOs that use a high frequency clock for fast response consume too much power [3], and asynchronous DLDOs can achieve lower current consumption and fast response, but suffer from larger steady-state error [4]. Also, previous DLDOs do not target load current in the $\lt 10 \mu \mathrm {A}$ range. To achieve ultra-low-current consumption, a wide dynamic load range down to nA loads, and good transient and steady-state performance, we propose a hybrid asynchronous binary-searching (ABS) and synchronous linear-searching (SLS) DLDO that achieves $3.8 \times 10 ^{5}$ dynamic load range, 99.99% current efficiency, and 2mV output voltage ripple, while consuming 745pA quiescent current.