HVNMOS/HVPMOS SWITCHED CAPACITOR CHARGE PUMP FOR IDEAL CHARGE TRANSFER

摘要

PPROBLEM TO BE SOLVED: To provide a method for suppressing on-resistances of main switches for a charge stage and a pump stage to the minimum, and to provide an integrated circuit for a charge pump. PSOLUTION: The integrated circuit includes: the charge stage; the pump stage; a single High-Voltage PMOS (HVPMOS) transistor as the main switch for each stage; and two sets of two minimum HVPMOS transistors connected in series as a bulk switch with fixed bulk connections, where the minimum HVPMOS transistors are smaller than the transistors of the main switch. The bulk of the main switch is switched synchronously to the voltage node of the HVPMOS transistor of the main switch to force the bulk voltage (VSBB/SB) to be equal to or larger than either the source voltage (VSBS/SB) or the drain voltage (VSBD/SB). Two non-overlapping clock signals are used to trigger the HVPMOS transistors of the charge stage and the pump stage. PCOPYRIGHT: (C)2010,JPO&INPIT