Title:
昇圧回路及びこれを用いた携帯機器
Document Type and Number:
Japanese Patent JP4615524
Kind Code:
B2
Abstract:
According to the invention, as an input voltage of a certain step-up unit of a plurality of stages of step-up units, a stepped-up output of a step-up unit in a stage preceding the certain step-up unit is inputted. This makes it possible to increase the level of a voltage stepped up by each step-up unit, and reduce the number of units. Furthermore, according to the invention, when an output voltage of a step-up unit that performs stepping-up operation according to a reference constant current is lower than a reference voltage, a reference constant current is produced; when the output voltage thereof exceeds the reference voltage, the reference constant current is stopped. This makes it possible to provide stable output of an output voltage at a predetermined level, and reduce an inrush current during start-up to a predetermined current level.
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Inventors:
Osamu Yanagida
Imanaka Yoshinori
Imanaka Yoshinori
Application Number:
JP2006547678A
Publication Date:
January 19, 2011
Filing Date:
October 19, 2005
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02M3/07
Domestic Patent References:
| JPH0888967A | 1996-04-02 | |||
| JP2001339938A | 2001-12-07 | |||
| JP2002119098A | 2002-04-19 | |||
| JPH06351229A | 1994-12-22 | |||
| JP2000066747A | 2000-03-03 |
Attorney, Agent or Firm:
Shizuo Sano