Voltage conversion circuit, semiconductor integrated circuit...

Details Voltage conversion circuit, semiconductor integrated circuit... Voltage conversion circuit, semiconductor integrated circuit...

2005-09-13

2005-09-13

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S901000, C323S282000

Reexamination Certificate

active

06943533

ABSTRACT:
A voltage conversion circuit alternately controls ON/OFF of a PMOS transistor and an NMOS transistor that are provided in series between high voltage power source lines, and outputs a low voltage obtained by causing a filter circuit to smooth an output voltage of each transistor. Further, the voltage conversion circuit uses the output voltage of the filter circuit as a power source of an output pulse signal generating circuit for driving the two transistors. Further, the voltage conversion circuit causes a start-up signal generating circuit to generate a start-up signal for forcing the PMOS transistor to turn ON during a predetermined period on start-up, and causes a switch control circuit to select the start-up signal instead of the pulse signal from the output pulse signal generating circuit, thereby realizing sure start-up.

REFERENCES:
patent: 6140848 (2000-10-01), Harvey
patent: 6166562 (2000-12-01), Mita et al.
patent: 6617898 (2003-09-01), Okuno et al.
patent: 6885229 (2005-04-01), Okuno et al.
patent: 2004/0004509 (2004-01-01), Okuno et al.
patent: WO 02/060042 (2002-08-01), None

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