Patent ID: 6538907
Filing Date: 2003-03-25
Classification: H02M

Abstract:
A voltage drop DC-DC converter comprising:first and second capacitors; an oscillator circuit for generating a signal having a specific frequency; a switch circuit including a plurality of switches for alternately connecting said first and second capacitors in series and in parallel in response to the output signal of said oscillator circuit; a DC power source for charging said first and second capacitors with a DC voltage when said first and second capacitors are connected in series; an output terminal for deriving a junction voltage at a junction point of said first and second capacitors when said first and second capacitors are connected in series and deriving a terminal voltage of said first and second capacitors when said first and second capacitors are connected in parallel; and a comparator for comparing the voltage at said output terminal with a predetermined reference voltage and generating a signal for stopping the oscillation of said oscillator circuit when the voltage at said output terminal is larger than the reference voltage, wherein said first and second capacitors are connected in parallel when the oscillation of said oscillator circuit is stopped.