Power supply voltage converting circuit, control method...

Details Power supply voltage converting circuit, control method... Power supply voltage converting circuit, control method...

2006-12-12

2006-12-12

Shalwala, Bipin (Department: 2673)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S204000

Reexamination Certificate

active

07148886

ABSTRACT:
In a power supply voltage converting circuit using a charge pump circuit having a switch device (Nch MOS transistor Qn(12) and Pch MOS transistor Qp(12)) in an output unit, a first clamp circuit (13) diode-clamps a switching pulse voltage (control pulse voltage) for the switch device at the time of starting the power supply voltage converting circuit, and a second clamp circuit (16) clamps the switching pulse voltage at a ground level (negative side circuit power supply potential) on the basis of a clamp pulse obtained by using an output voltage Vout at the time of an end of the starting process. A sufficient driving voltage is thereby provided for the Pch MOS transistor Qp(12) in particular. Thus, a power supply voltage converting circuit that can obtain a high current capacity on a small-area circuit scale, a control method thereof, a display apparatus having the power supply voltage converting circuit as a power supply circuit, and a portable terminal having the display apparatus are provided.

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