US 7,960,955 B2
Power supply device, electronic device using the same, and semiconductor deviceGeneral
US 7,960,955 B2
Power supply device, electronic device using the same, and semiconductor device
Tech Center:
2800 Semiconductors/Memory, Circuits/Measuring and Testing, Optics/Photocopying, Printing/Measuring and Testing
Examiner:
Matthew V Nguyen
Art Unit:
2838 Electrical Circuits and Systems
Agent:
Inventors:
Tomoyuki Ito; Yoichi Tamegai; Koki Tamakawa; Isao Yamamoto
Assignee:
Priority:
11/30/06
Filed:
11/30/06
Granted:
06/14/11
Expiration:
11/23/27
Abstract
A linear regulator is provided which stabilizes an input voltage based on a reference voltage source that generates a reference voltage, and the reference voltage generated by the reference voltage. An output voltage of the linear regulator is supplied as a power supply voltage of a switching controller and the reference voltage source. The linear regulator is configured to enable switching of a regulation mode in which voltage is outputted according to the reference voltage, and a bypass mode in which an input voltage is outputted as it is, with no relation to the reference voltage. When a power supply apparatus is started up, during a time period until the input voltage reaches a predetermined threshold voltage, the linear regulator operates in the bypass mode, and when the input voltage exceeds the threshold voltage, operates in the regulation mode.
Cooperative Patent Classification (CPC)
H02H02M3/33507H02M