A 47-nA Quiescent Current Dual-Mode Buck Converter With Fast Load Transient Response From Ultra-Light Load Mode

IF 4.6 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems II: Express Briefs Pub Date : 2026-04-01 Epub Date: 2026-02-25 DOI:10.1109/TCSII.2026.3668052

Dongxu Li;Yanqi Zheng;Xian Tang

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引用次数: 0

Abstract

This brief proposes a dual-mode ultra-low quiescent current buck converter that achieves high efficiency over a wide load range. The system employs adaptive on-time control (AOT) for heavy load and adaptive clock control (ACC) for light load. To enhance transient performance under light load, a fast clock frequency locking (FCFL) circuit is proposed to enable quick load tracking with simple digital logic. Additionally, a nA low-power load step transient enhancement (LSTE) circuit is presented, effectively reducing overshoot and undershoot during load transients. The converter is implemented in a

$0.18~\mu $

m process and operates with an input voltage of 2.4 V to 3.3 V and an output of 1.6 V. The load current ranges from 500 nA to 300 mA. The total quiescent current is 47 nA contributed to ACC digital control and it achieves 87% efficiency at

$1~\mu $

A load current, with a peak efficiency of 95.9% at 2.4V input. It achieves an undershoot voltage of 60 mV with recovery time of

$6~\mu $

s when load current switching from

$100~\mu $

A to 100 mA.

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在超轻负载模式下具有快速负载瞬态响应的47-nA静态电流双模降压变换器

本文提出了一种双模超低静态电流降压变换器，可在宽负载范围内实现高效率。系统采用自适应准时控制（AOT）对重载和自适应时钟控制（ACC）对轻负载。为了提高轻负载下的瞬态性能，提出了一种快速时钟频率锁定（FCFL）电路，通过简单的数字逻辑实现快速负载跟踪。此外，提出了一种低功耗负载阶跃瞬态增强电路，有效地降低了负载瞬态过程中的过调和欠调。该变换器实现在$0.18~ $ μ $ m工艺中，工作电压为2.4 V至3.3 V，输出电压为1.6 V。负载电流范围从500na到300ma。总静态电流为47 nA，用于ACC数字控制，在负载电流为1~\mu $ A时效率为87%，在2.4V输入时最高效率为95.9%。当负载电流从$100~\mu $ A切换到$100 mA时，其欠冲电压为60 mV，恢复时间为$6~\mu $ s。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程：电子与电气

CiteScore

7.90

自引率

20.50%

发文量

883

审稿时长

3.0 months

期刊介绍： TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.