Title:
SWITCHING REGULATOR
Document Type and Number:
Japanese Patent JP2007259599
Kind Code:
A
Abstract:
To provide a switching regulator operating with low power consumption by preventing a variation in output voltage.
The switching regulator comprises an oscillation circuit which determines on-timing in a PWM control mode, a comparison voltage source which determines an on-time in the PFM control mode, and a multiplexer outputting one of a voltage of the comparison voltage source or an output of an error-amplifying circuit. The on-timing in the PWM control mode and the on-time in the PFM control mode are determined by switching a voltage inputted to a comparison circuit by means of the multiplexer.
COPYRIGHT: (C)2008,JPO&INPIT
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Inventors:
SOMA SHOTARO
Application Number:
JP2006081520A
Publication Date:
October 04, 2007
Filing Date:
March 23, 2006
Export Citation:
Assignee:
RICOH KK
International Classes:
H02M3/00
Domestic Patent References:
| JP2003070242A | 2003-03-07 | |||
| JP2005012921A | 2005-01-13 |
Foreign References:
| US20070057658A1 | 2007-03-15 | |||
| US7061213B2 | 2006-06-13 |
Attorney, Agent or Firm:
Tadahiko Ito