Patent ID: 6812782
Filing Date: 2004-11-02
Classification: H02M,Y02B

Abstract:
A switch mode converter circuit comprising:a high side transistor; a low side transistor coupled to the high side transistor; an inductor having a first end coupled to a node between the high side transistor and the low side transistor and a second end coupled to an output node; a boot capacitor having a first end coupled to the first end of the inductor; a high side driver coupled to a control node of the high side transistor; a first diode coupled between a second end of the boot capacitor and an input voltage node; a charge pump for providing additional charge to the boot capacitor when a duty cycle of the switch mode converter circuit is one hundred percent; wherein the charge pump is coupled to the control node of the high side transistor; wherein a first switch is coupled between the charge pump and the control node of the high side transistor; and wherein a second switch is coupled between the high side driver and the control node of the high side transistor.