Charge pump circuit and integrated circuit

A charge pump and circuit technology, applied in electrical components, conversion equipment without intermediate conversion to AC, and output power conversion devices, etc., can solve problems such as non-resistance of electrostatic discharge, reduce leakage current, reduce on-chip area, The effect of improving performance

CN101317320AInactive Publication Date: 2008-12-03NXP BV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-12-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

A charge pump circuit for increasing a circuit voltage, comprising: a DC-DC up-converter (14) having an array of capacitors arranged to charge-pump to a higher voltage than the circuit voltage, the DC-DC up-converter having an output lead (8) arranged to output the higher voltage, a DC-DC down-converter (30) connected to the output lead, the DC-DC down-converter having an array of capacitors and diodes arranged to down-pump the higher voltage, and an ESP (Electrostatic Discharge Protection) circuit comprising a series (42) of N series-connected diodes arranged to sink current from the output lead, wherein N is an integer larger than two, each diode having its anode permanently connected to the output lead and its cathode permanently connected to a reference potential, wherein the series includes the diodes of the DC-DC down-converter.
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Description

technical field

[0001] The invention relates to a charge pump circuit and an integrated circuit. Background technique

[0002] Typically, a charge pump circuit for boosting a DC voltage circuit can include:

[0003] - a DC-DC boost converter having an array of capacitors for boosting the circuit voltage to a higher voltage, a DC-DC boost converter having an output lead for outputting the higher voltage, and

[0004] - A DC-DC buck converter connected to the output lead, the DC-DC buck converter having an array of capacitors and diodes for stepping down the higher voltage.

[0005] The DC-DC boost converter also has a diode that prevents current from being drawn from the output lead through the DC-DC boost converter.

[0006] Current sinking through the DC-DC buck converter is only possible when the DC-DC buck converter is activated. The DC-DC buck converter may only be activated when the DC-DC boost converter is disabled.

[0007] Therefore, the circuit described above d...

Examples

Embodiment Construction

[0032] figure 1 An integrated circuit 2 is shown. Hereinafter, no detailed description will be given for functions or structures that are well known to those skilled in the art.

[0033] More precisely, figure 1 A portion of the on-chip area of ​​an integrated circuit is shown, where a charge pump circuit 4 is implemented to boost the DC circuit voltage V dd .

[0034] Circuit 4 has a function for receiving the voltage V dd The input leads 6 and for the output higher DC voltage V OUT output leads 8.

[0035] The leads 8 are connected to an on-chip load 10 . For example, load 10 is a capacitive load with capacitor 12 .

[0036] A DC-DC boost converter 14 is connected directly between leads 6 and 8 to boost lead 8 to a higher voltage V OUT .

[0037] Converter 14 is, for example, a Dickson charge pump converter. Such converters are described, for example, in the following references:

[0038] "On-chip high-voltage generation in MNOS integrated circuits using an improv...