A 95.43%-Peak-Efficiency Buck Converter with Seamless PWM/PFM Transition and 12.3-μA Quiescent Current for Wide-Load Applications | Zendy

Xiao-Hui Hu | Zendy; Wan-Yuan Qu | Zendy; Yong Ding | Zendy

Open Access

A 95.43%-Peak-Efficiency Buck Converter with Seamless PWM/PFM Transition and 12.3-μA Quiescent Current for Wide-Load Applications

Author(s) -

Xiao-Hui Hu,

Wan-Yuan Qu,

Yong Ding

Publication year - 2025

Publication title -

ieee access

Language(s) - English

Resource type - Magazines

SCImago Journal Rank - 0.587

H-Index - 127

eISSN - 2169-3536

DOI - 10.1109/access.2025.3612097

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

This study presents a high-efficiency synchronous buck converter IC featuring wide load-range capability and ultra-low power consumption. The design employs an integrated PWM/PFM control scheme where a clamp circuit integrated into the PWM control loop and a clamp-current-dependent frequency-reduction module enable PFM operation under light-load conditions. This architecture achieves seamless PWM-to-PFM transition with minimized output voltage ripple, enhances light-load efficiency, and significantly reduces circuit complexity. Implementation of peak/valley current detection modules elevates sensing accuracy and control precision, thereby improving dynamic response characteristics. A time-division module activation strategy further reduces the controller's quiescent current, optimizing ultra-light-load efficiency. The power-enable control module establishes dual-stability mechanisms for power rails and reference voltages, ensuring controlled module activation only after stable initialization to guarantee proper power sequencing and operational reliability. Fabricated in 0.18μm BCD technology, measurement results demonstrate stable startup characteristics, smooth PWM/PFM transitions, 95.43% peak efficiency at 8V-to-5V conversion, >90% efficiency across the 5mA-6A load range, and 12.3μA no-load ground current.

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