A Dynamically Reconfigurable Recursive Switched-Capacitor DC-DC Converter with Adaptive Load Ability Enhancement

A Dynamically Reconfigurable Recursive Switched-Capacitor DC-DC Converter with Adaptive Load Ability Enhancement

Lu, Qi (Student TU Delft)
Li, Shuangmu (Student TU Delft)
Zhao, Bo (Zhejiang University)
Jiang, Junmin (Southern University of Science and Technology of China)
Chen, Zhiyuan (Fudan University)
Du, S. (TU Delft Electronic Instrumentation)

2023

Multiple voltage conversion ratio (VCR) recursive switched-capacitor (SC) dc-dc converters, based on several basic 2:1 converters, are widely used for on-chip power supplies due to their flexible VCRs for higher energy efficiency. However, conventional multiple VCR SC converters usually have one or more 2:1 converters unused for some VCRs, which results in lower power density and chip area wastage. This article presents a new recursive dc-dc converter system, which can dynamically reconfigure the connection of all on-chip 2:1 converter cells so that the unused converters in the conventional designs can be reused in this new architecture for increasing the load-driving capacity, power density, and power efficiency. To validate the design, a 4-bit-input 15-ratio system was designed and fabricated in a 180-nm BCD process, which can support a maximum load current of \text{0.71}\,\text{mA} and achieves a peak power efficiency of 93.1% with 105.3\,\mu \text{A/mm} {2} chip power density from a 2-V input power supply. The measurement results show that the load-driving capacity can become 6.826×, 2.236×, and 2.175× larger than the conventional topology when the VCR is 1/2, 1/4, and 3/4, respectively. In addition, the power efficiency under these specific VCRs can also be improved considerably.

Capacitors
DC-DC converters
DC-DC power converters
fully integrated
Impedance
multiple voltage conversion ratios (VCRs)
recursive switched capacitor (RSC)
switched-capacitor
Switches
System-on-chip
Topology
Video recording

http://resolver.tudelft.nl/uuid:eb00c4ec-62f1-46dd-8e97-acfb6c0e8122

https://doi.org/10.1109/TPEL.2023.3235305

2023-07-10

0885-8993

IEEE Transactions on Power Electronics, 38 (4), 5032-5040

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2023 Qi Lu, Shuangmu Li, Bo Zhao, Junmin Jiang, Zhiyuan Chen, S. Du