一款高效率、三模式、低EMI的同步整流型Buck DC-DC转换器

doi:10.3969/j.issn.1000-5641.2026.02.008

华东师范大学学报（自然科学版） ›› 2026, Vol. 2026 ›› Issue (2): 82-94.doi: 10.3969/j.issn.1000-5641.2026.02.008

• 电源管理与数据转换器 • 上一篇下一篇

一款高效率、三模式、低EMI的同步整流型Buck DC-DC转换器

丁世翔, 郝松茂, 石春琦*()

华东师范大学微电子电路与系统研究所, 上海　200241

收稿日期:2025-08-29 接受日期:2025-12-04 出版日期:2026-03-25 发布日期:2026-04-03
通讯作者: 石春琦 E-mail:cqshi@ee.ecnu.edu.cn
基金资助:
上海市科委资助项目 (22DZ2229004); 中央高校基本科研业务费专项资助项目 (40500-20103-222178)

High-efficiency, tri-mode, low-EMI synchronized buck DC-DC converter

Shixiang DING, Songmao HAO, Chunqi SHI*()

Institute of Microelectronic Circuits and Systems, East China Normal University, Shanghai　200241, China

Received:2025-08-29 Accepted:2025-12-04 Online:2026-03-25 Published:2026-04-03
Contact: Chunqi SHI E-mail:cqshi@ee.ecnu.edu.cn

摘要/Abstract

摘要：

基于国产55 nm CMOS (Complementary Metal-Oxide-Semiconductor) 工艺, 设计了一款适合低电磁干扰 (Electromagnetic Interference, EMI) 应用, 峰值效率为92.95%的三模式Buck DC-DC转换器芯片. 在不同负载条件下, 该DC-DC芯片可以在脉冲宽度调制 (Pulse Width Modulation, PWM)、脉冲频率调制 (Pulse Frequency Modulation, PFM) 以及跳脉冲调制 (Pulse Skip Modulation, PSM) 间无缝切换, 优化了效率与纹波表现. 芯片基于扩频调制技术 (Spread-Spectrum Frequency Modulation, SSFM), 通过实现35%频率抖动的扩频调制, 使得Buck转换器的输出电压频谱峰值降低22 dB, 显著抑制了DC-DC转换器产生的电磁干扰.

关键词: Buck转换器, 低EMI, 扩频调制, 多工作模式, 高效率

Abstract:

This paper presents a tri-mode buck converter designed using the 55 nm Complementary Metal-Oxide-Semiconductor (CMOS) process, which offers a peak efficiency of 92.95% for low-EMI applications. The converter employs a seamless transition between pulse-width modulation (PWM), pulse-frequency modulation (PFM), and pulse-skip modulation (PSM) modes under various load conditions, which optimizes the efficiency and ripple performance from light to heavy loads. By implementing spread-spectrum frequency modulation with 35% frequency dithering, the converter reduces the peak of the output voltage spectrum by 22 dB, thus significantly reducing the EMI emission spectrum.

Key words: buck converter, low-EMI, spread spectrum frequency modulation (SSFM), multiple operating modes, high efficiency

中图分类号:

TN432

丁世翔, 郝松茂, 石春琦. 一款高效率、三模式、低EMI的同步整流型Buck DC-DC转换器[J]. 华东师范大学学报（自然科学版）, 2026, 2026(2): 82-94.

Shixiang DING, Songmao HAO, Chunqi SHI. High-efficiency, tri-mode, low-EMI synchronized buck DC-DC converter[J]. J* E* C* N* U* N* S*, 2026, 2026(2): 82-94.

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参考文献 19

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参数	Leoncini等^[4]	Yang等^[18]	Hu等^[19]	本文
工艺	180 nm CMOS	55 nm CMOS	180 nm CMOS	55 nm CMOS
输入电压	2.8~4.2 V	4.5~5.5 V	2.5~5.5 V	2.7~3.3 V
输出电压	1.3~2.2 V	1.8~3.3 V	0.5~4.8 V	1.8 V
工作模式	CFC PWM	PWM	PWM	PSM/PFM/PWM
扩频调制方法	固定斜率调制	真随机数伪滞后调制	固定斜率调制	固定斜率调制
扩频中心频率	9.5 MHz	1 MHz	12.2 MHz	1.2 MHz (CCM模式) 0.1 MHz (DCM模式)
最大扩频百分比	30%	43%	25%	35%
频谱峰值降低量	19 dB*	35.4 dB	20 dB*	22 dB*
支持DCM工作模式	否	否	否	是
峰值效率	88.2%	92.4%	90.5%	92.95%
轻载效率 (10 mA)	<60%	<70%	<60%	86%

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一款高效率、三模式、低EMI的同步整流型Buck DC-DC转换器

High-efficiency, tri-mode, low-EMI synchronized buck DC-DC converter

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