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Text: User's Guide SNVA014C – November 1999 – Revised April 2013 AN-1142 LM2661/3/4 Evaluation Board 1 Introduction The LM2661, LM2663, and LM2664 are part of a family of CMOS charge-pump voltage converters Table 3 . Each uses two small capacitors to achieve voltage inversion or voltage doubling without the