Title:
POWER SUPPLY GENERATION CIRCUIT, DISPLAY, AND PORTABLE TERMINAL UNIT
Document Type and Number:
Japanese Patent JP3687597
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that the amount of the loss of power consumption is large when allowing a current to flow to a voltage-dividing resistor and a comparator used for comparing voltages even in cases other than the voltage comparison of regulation in a DC-DC convertor having a regulation function.
SOLUTION: In a DC-DC convertor having a charge pump circuit 31, a voltage-dividing circuit 32, and a regulation circuit 33, by the ON/OFF control of PchMOS transistors Qp21, Qp22, and Qp31 based on an enable pulse enb, the voltage-dividing circuit 32 and a comparator 41 are set to be in active states only during a regulation period, and are set to be in inactive states in periods except the regulation period. As a result, a current is allowed to flow to voltage-dividing resistors R1 and R2 and the comparator 41 only for a fixed period required for regulation operation, thus inhibiting the loss of power consumption caused by allowing the current to continuously flow to the voltage- dividing resistors R1 and R2 and the comparator 41.
Inventors:
Noboru Toyosawa
Yoshiharu Nakajima
Yoshiharu Nakajima
Application Number:
JP2001366340A
Publication Date:
August 24, 2005
Filing Date:
November 30, 2001
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G09G3/36; G09G3/20; H02M3/07; H04B7/26; H04W52/02; H04W88/02; (IPC1-7): H02M3/07; G09G3/20; G09G3/36; H04B7/26
Domestic Patent References:
| JP2001326567A | ||||
| JP2000262044A | ||||
| JP2001095234A |
Attorney, Agent or Firm:
Funabashi Kuninori
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