Design concepts and preliminary implementations of dual output supercapacitor-assisted low-dropout regulators (DO-SCALDO)

Supercapacitor-assisted low dropout regulators (SCALDO) technique has been developed to improve the end-to-end efficiency of linear regulators by factor of 1.33 to 3. In this approach, a low frequency supercapacitor circulation stage is combined with a commercial LDO to achieve the overall efficiency improved design. After successful implementation of various SCALDO prototypes, practically useful further improvements for original concept were considered. Dual output (DO-SCALDO) has been suggested as an improvement to provide two output levels in a single design while maintaining the useful hallmarks of the original SCLADO approach. The new improvement: the DO-SCALDO technique, can generate dual output levels which are same or different. A circuit prototype of a 7V-to-dual-1.5 V DO-SCALDO was built and tested to prove the concept and summary of results are presented.

[1]  Nihal Kularatna,et al.  A low frequency supercapacitor circulation technique to improve the efficiency of linear regulators based on LDO ICs , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[2]  John F. Dickson,et al.  On-Chip High-Voltage Generation in Integrated Circuits Using an Improved Multiplier Technique , 1976 .

[3]  Ralph Monteiro,et al.  High Current Voltage Regulator Module Employs Novel Packaging Technology to Achieve Over 100A in a Compact Footprint to Power Next Generation Servers , 2002 .

[4]  J. F. Dickson,et al.  On-chip high-voltage generation in MNOS integrated circuits using an improved voltage multiplier technique , 1976 .

[5]  Nihal Kularatna,et al.  Laplace transform — Based theoretical foundations and experimental validation — Low frequency supercapacitor circulation technique for efficiency improvements in linear regulators , 2011 .

[6]  Hao Min,et al.  Combination method of DC-DC converter and LDO to improve efficiency and load regulation , 2011 .

[7]  Qiang Li,et al.  An Ultrafast Adaptively Biased Capacitorless LDO With Dynamic Charging Control , 2012, IEEE Transactions on Circuits and Systems II: Express Briefs.

[8]  Eby G. Friedman,et al.  Active Filter-Based Hybrid On-Chip DC–DC Converter for Point-of-Load Voltage Regulation , 2013, IEEE Transactions on Very Large Scale Integration (VLSI) Systems.

[9]  A. von Jouanne,et al.  Use of sigma-delta modulation to control EMI from switch-mode power supplies , 2001, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[10]  Nihal Kularatna,et al.  An extra-low-frequency RS-SCALDO technique: A new approach to design voltage regulator modules , 2015, 2015 IEEE Applied Power Electronics Conference and Exposition (APEC).

[11]  Nihal Kularatna,et al.  Improving the End-to-End Efficiency of DC–DC Converters Based on a Supercapacitor-Assisted Low-Dropout Regulator Technique , 2014, IEEE Transactions on Industrial Electronics.

[12]  K. Kankanmage,et al.  Supercapacitor assisted LDO (SCALDO) techniquean extra low frequency design approach to high efficiency DC-DC converters and how it compares with the classical switched capacitor converters , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).