10.7 A 25MHz 4-phase SAW hysteretic DC-DC converter with 1-cycle APC achieving 190ns tsettle to 4A load transient and above 80% efficiency in 96.7% of the power range

Bumkil Lee, Min Kyu Song, Ashis Maity, D. Brian Ma

Research output: ResearchConference contribution

Abstract

Switching power converters with fast load transients are crucial for application processors (APs) to facilitate system-level power adaptability with high current slew rate. While current-mode hysteretic control has been popularly employed in switching converters for simple structure, robust operation and fast transient response [1], it still does not suffice for the unprecedented 1A/ns current slew rate required by modern APs [2]. Meanwhile, current slew rate can be improved by extending single-phase to multiphase operation. However, when a converter powers light load, power loss caused by added phases adversely affects the efficiency. Active phase count (APC) was thus proposed to manage the number of active phases judiciously to load by sensing average inductor current [3,4]. However, the inherent sensing delay drastically slows down the phase adding/dropping actions and degrades load transient response. On the other hand, phase current imbalance among phase sub-converters could cause hot spots, jeopardizing system reliability. Upgrading from conventional current-mode hysteretic control, we propose a simple synchronized adaptive window (SAW) hysteretic control which automatically adjusts the hysteretic window to speed up the transient response. Inherent clock synchronization makes it a natural fit to multiphase operation, where APC can be accomplished within one switching cycle through an internal current sensing mechanism in the control.

LanguageEnglish (US)
Title of host publication2017 IEEE International Solid-State Circuits Conference, ISSCC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages190-191
Number of pages2
Volume60
ISBN (Electronic)9781509037575
DOIs
StatePublished - Mar 2 2017
Event64th IEEE International Solid-State Circuits Conference, ISSCC 2017 - San Francisco, United States
Duration: Feb 5 2017Feb 9 2017

Other

Other64th IEEE International Solid-State Circuits Conference, ISSCC 2017
CountryUnited States
CitySan Francisco
Period2/5/172/9/17

Fingerprint

DC-DC converters
Transient analysis
Power converters
Clocks
Synchronization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Lee, B., Song, M. K., Maity, A., & Ma, D. B. (2017). 10.7 A 25MHz 4-phase SAW hysteretic DC-DC converter with 1-cycle APC achieving 190ns tsettle to 4A load transient and above 80% efficiency in 96.7% of the power range. In 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017 (Vol. 60, pp. 190-191). [7870325] Institute of Electrical and Electronics Engineers Inc.. DOI: 10.1109/ISSCC.2017.7870325

10.7 A 25MHz 4-phase SAW hysteretic DC-DC converter with 1-cycle APC achieving 190ns tsettle to 4A load transient and above 80% efficiency in 96.7% of the power range. / Lee, Bumkil; Song, Min Kyu; Maity, Ashis; Ma, D. Brian.

2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. Vol. 60 Institute of Electrical and Electronics Engineers Inc., 2017. p. 190-191 7870325.

Research output: ResearchConference contribution

Lee, B, Song, MK, Maity, A & Ma, DB 2017, 10.7 A 25MHz 4-phase SAW hysteretic DC-DC converter with 1-cycle APC achieving 190ns tsettle to 4A load transient and above 80% efficiency in 96.7% of the power range. in 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. vol. 60, 7870325, Institute of Electrical and Electronics Engineers Inc., pp. 190-191, 64th IEEE International Solid-State Circuits Conference, ISSCC 2017, San Francisco, United States, 2/5/17. DOI: 10.1109/ISSCC.2017.7870325
Lee B, Song MK, Maity A, Ma DB. 10.7 A 25MHz 4-phase SAW hysteretic DC-DC converter with 1-cycle APC achieving 190ns tsettle to 4A load transient and above 80% efficiency in 96.7% of the power range. In 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. Vol. 60. Institute of Electrical and Electronics Engineers Inc.2017. p. 190-191. 7870325. Available from, DOI: 10.1109/ISSCC.2017.7870325
Lee, Bumkil ; Song, Min Kyu ; Maity, Ashis ; Ma, D. Brian. / 10.7 A 25MHz 4-phase SAW hysteretic DC-DC converter with 1-cycle APC achieving 190ns tsettle to 4A load transient and above 80% efficiency in 96.7% of the power range. 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. Vol. 60 Institute of Electrical and Electronics Engineers Inc., 2017. pp. 190-191
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