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A dual-phase charge pump circuit with compact size

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Abstract

In this paper, a regulated dual-phase charge pump with compact size is presented. By means of a nano-ampere switched-capacitor voltage reference (SCVR) circuit, the dual-phase charge pump regulator can reduce the quiescent current and the output ripple. Besides, a new power stage is proposed to define the stability of the overall system. Owing to the design of buffer stage, the charge pump regulator can extend bandwidth and increase phase margin. Thus, the transient response and driving capability can be improved. Beside, the proposed automatic body switching circuit can efficiently drive the bulk of the power p-type MOSFETs to avoid leakage and potential latch-up. This chip was fabricated by TSMC 0.35 μm, 3.3 V/5 V 2P4 M CMOS technology. The input voltage range varies from 2.9 to 4.9 V for the lithium battery and the output voltage is regulated at 5 V. Experimental results demonstrate the charge pump can provide 50 mA maximum load current without any oscillation problems.

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Acknowledgements

The authors wish to thank to Chunghwa Picture Tubes, LTD for their help. This research is also supported by the National Science Council, Taiwan, R.O·C. under Grant NSC 96-2221-E-009-240.

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Authors and Affiliations

  1. Department of Electrical and Control Engineering, National Chiao Tung University, Hsinchu, Taiwan

    Ming-Hsin Huang, Chun-Yu Hsieh, Po-Chin Fan & Ke-Horng Chen

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  1. Ming-Hsin Huang
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  2. Chun-Yu Hsieh
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Correspondence to Ke-Horng Chen.

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Huang, MH., Hsieh, CY., Fan, PC. et al. A dual-phase charge pump circuit with compact size. Analog Integr Circ Sig Process 64, 55–67 (2010). https://doi.org/10.1007/s10470-009-9359-x

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