Patent ID: 7242564
Filing Date: 2007-07-10
Classification: H02H

Abstract:
1. An ESD protection circuit for a charge pump circuit, the charge pump circuit includes a source pin set, a target pin set and a grounding pin electrically connected to ground, each of the source and target pin set includes a first positive pin providing a first positive voltage, a second positive pin providing a second positive voltage, a first negative pin providing a first negative voltage and a second negative pin providing a second negative voltage, the ESD protection circuit comprising: a first diode reversely connected between the first positive pin of the source pin set and the grounding pin; a second diode having a first anode and a first cathode, both connected to the first positive pin of the source pin set; a third diode reversely connected between the second positive pin of the source pin set and the grounding pin; a fourth diode reversely connected between the first positive pin of the source pin set and the second positive pin of the source pin set; a fifth diode reversely connected between the first negative pin of the source pin set and the grounding pin; a sixth diode having a second anode and a second cathode, both connected to the first negative pin of the source pin set; a seventh diode reversely connected between the second negative pin of the source pin set and the grounding pin; and an eighth diode reversely connected between the second negative pin of the source pin set and the first negative pin of the source pin set, wherein the first positive pin provides voltage greater than or equal to voltage provided by the second positive pin, and the first negative pin provides voltage less than or equal to the voltage provided by the second negative pin.