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US 2003/0067289 A1Published application
Power supply circuit and control method for the same
AssigneeSeiko Epson Corporation
InventorAkira Morita
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AssigneeSeiko Epson Corporation
InventorAkira Morita
Estimating the term…
A power supply circuit and control method enable faster startup after the power source turns on, and then supplies power with high efficiency to keep power consumption low. The power supply circuit has a charge pump step-down circuit, a first regulator, a switching circuit, and a switching control circuit. The step-down circuit steps down the power supply potential VDD to generate a step-down potential by charge pumping based on a step-down clock supplied from the LCD controller. When the system power source turns on a switching signal generated by the switching control circuit causes the switching circuit to select and output the adjusted potential from the first regulator as the output voltage VOUT. When a subsequent switching signal is applied the switching circuit selects and outputs the step-down potential from the step-down circuit as the output voltage VOUT. The step-down circuit may output a step-down potential after the potential is adjusted by a second regulator.
A power supply circuit for generating a third potential based on a first potential and a second potential, the power supply circuit comprising:
A power supply circuit for generating a third potential based on a first potential and a second potential, the power supply comprising:
A method for controlling a power supply circuit that generates a third potential based on a first potential and a second potential, the control method comprising the steps of:
A method for controlling a power supply circuit that generates a third potential based on a first potential and a second potential, the control method comprising the steps of:
Dependencies are inferred from the claim text.