Charge pump circuit and nonvolatile memory

Abstract

The invention discloses a charge pump circuit and a nonvolatile memory. The charge pump circuit comprises a plurality of boost-stage charge pump units which are connected in series, and each boost-stage charge pump unit comprises an input end; an output terminal; a first capacitor; the first end of the second capacitor is connected with the output end; a third capacitor; the control end of the first switch tube is connected with the first end of the first capacitor, the first access end is connected with the input end, and the second access end is connected with the output end; a first one-way conduction element; the control end of the third switch tube is connected with the input end, the first access end is connected with the first end of the first capacitor, and the second access end is connected with the first end of the third capacitor; in the charge storage stage, the first switch tube is switched on, and the second capacitor is charged; in the charge release stage, the second capacitor provides charges for the next-stage charge pump, and the charges at the control end of the first switching tube are transferred to the third capacitor through the third switching tube. The first switch tube in the charge pump unit can be fully conducted, and the current transmission capability of the charge pump circuit is improved.

Description

technical field [0001] The present invention relates to the technical field of integrated circuits, and more particularly, to a charge pump circuit and a nonvolatile memory. Background technique [0002] When NVM (Non-Volatile Memory) works, several high voltages are generated on-chip through low-voltage power supplies for reading, erasing and writing operations of memory cells. These voltages are usually set by the internal charge. The Charge Pump circuit is generated. A charge pump circuit, also known as a switched capacitor voltage converter, is a DC-DC (converter) that utilizes "flying" or "pumping" capacitors (rather than inductors or transformers) to store energy. [0003] The charge pump circuit receives the low voltage power supply and boosts the voltage through multiple stages, and then the output stage of the charge pump circuit outputs the target high voltage. Currently, the transfer transistor in the boost stage unit of the charge pump circuit cannot be fully t...

AI Technical Summary

Problems solved by technology

At present, the transfer transistor in the boost stage unit of the charge pump circuit is not fully turned on, which reduces the ability to transfer current. Therefore, a charge pump circuit with higher current transfer capability is required

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