Reducing Startup-Time Inrush Current in Charge-Pump Circuits

Takao MYONO  Yoshitaka ONAYA  Kenji KASHIWASE  Haruo KOBAYASHI  Tomoaki NISHI  Kazuyuki KOBAYASHI  Tatsuya SUZUKI  Kazuo HENMI  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E87-A   No.4   pp.787-791
Publication Date: 2004/04/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Selected Papers from the 16th Workshop on Circuits and Systems in Karuizawa)
Category: 
Keyword: 
charge-pump circuit,  inrush current,  DC-DC converter,  high-voltage generator circuit,  power supply circuit,  

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Summary: 
We have developed a high-efficiency charge-pump power supply circuit with large output current capability for mobile equipment. However, during the commercialization phase, we found that the large inrush current of 270 mA at charge-pump circuit startup-time could cause problems. In this paper we analyze the mechanism that causes this inrush current, and we propose circuitry to reduce it. We show SPICE simulation and measurement results for our proposed circuitry that confirm its effectiveness. By incorporating this circuitry, startup-time inrush current was reduced to 30 mA.