Title:
充電回路およびそれを用いた電子機器
Document Type and Number:
Japanese Patent JP4658855
Kind Code:
B2
Abstract:
In a charging circuit charging a battery based on a power supply voltage from an external power supply, a charging transistor is provided on a path from the external power supply to the battery. A charging control circuit is integrated on a semiconductor substrate, and adjusts an ON state of the charging transistor to control a charging current supplied to the battery. The voltage adjusting circuit provided on an electric power supply path from the external power supply to a power supply terminal of the charging control circuit generates a necessary voltage drop. The current adjusting circuit adjusts the ON state of the charging transistor such that a voltage of the battery is brought close to a predetermined voltage value. The clamp circuit clamps a voltage at the power supply terminal of the charging control circuit below a predetermined clamp voltage.
Inventors:
Master Satoshi
Isamu Yamamoto
Yukito Horiuchi
Isamu Yamamoto
Yukito Horiuchi
Application Number:
JP2006130453A
Publication Date:
March 23, 2011
Filing Date:
May 09, 2006
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02J7/00; G05F1/10; H01M10/44; H02H7/18
Domestic Patent References:
| JP8149702A | ||||
| JP2002010505A | ||||
| JP2002369373A |
Attorney, Agent or Firm:
Sakaki Morishita