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 (TU Delft Electrical Engineering, Mathematics and Computer Science)

Du, S. (mentor)
van der Meijs, N.P. (graduation committee)

Delft University of Technology

Electrical Engineering

2022-07-27

Multiple voltage conversion ratio (VCR) recursive switched-capacitor (SC) DC-DC
converters, based on a number of basic 2:1 converters, are widely used for on-chip power supplies due to their flexible VCRs for higher energy efficiency. However, conventional multi-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 paper presents a new recursive DC-DC converter system, which is able to dynamically reconfigure the connection of all on-chip 2:1 converter cells so that the unused converters in conventional designs can be re-used 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 0.71mA and achieve a peak power efficiency of 93.1% with 105.3μA/mm^2 chip power density from a 2V 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.

DC-DC converters
switched-capacitor
recursive switched capacitor (RSC)
fully integrated
multiple voltage conversion ratio (VCR)

http://resolver.tudelft.nl/uuid:f109f488-539c-4448-b498-885ff5c34075

2023-01-01

Student theses

master thesis

© 2022 Qi Lu