SEMICONDUCTOR INTEGRATED CIRCUITS

A novel low ripple charge pump with a 2X/1.5X booster for PCM

Fu Cong, Song Zhitang, Chen Houpeng, Cai Daolin, Wang Qian, Hong Xiao, Ding Sheng and Li Xi

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Abstract: A low ripple switched capacitor charge pump applicable to phase change memory (PCM) is presented. For high power efficiency, the selected charge pump topology can automatically change the power conversion ratio between 2X/1.5X modes with the input voltage. For a low output ripple, a novel operation mode is used. Compared with the conventional switched capacitor charge pump, the flying capacitor of the proposed charge pump is charged to Vo-Vin during the charge phase (Vo is the prospective output voltage). In the discharge phase, the flying capacitor is placed in series with the Vin to transfer energy to the output, so the output voltage is regulated at Vo. A simulation was implemented for a DC input range of 1.6-2.1 V in on SMIC standard 40 nm CMOS process, the result shows that the new operation mode could regulate the output of about 2.5 V with a load condition from 0 to 10 mA, and the ripple voltage is lower than 4 mV. The maximum power efficiency reaches 91%.

Key words: charge pumpDC to DC converterPCM driverslow ripplepower efficiency

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    Received: 20 August 2015 Revised: 11 April 2012 Online: Published: 01 September 2012

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      Fu Cong, Song Zhitang, Chen Houpeng, Cai Daolin, Wang Qian, Hong Xiao, Ding Sheng, Li Xi. A novel low ripple charge pump with a 2X/1.5X booster for PCM[J]. Journal of Semiconductors, 2012, 33(9): 095001. doi: 10.1088/1674-4926/33/9/095001 Fu C, Song Z T, Chen H P, Cai D L, Wang Q, Hong X, Ding S, Li X. A novel low ripple charge pump with a 2X/1.5X booster for PCM[J]. J. Semicond., 2012, 33(9): 095001. doi: 10.1088/1674-4926/33/9/095001.Export: BibTex EndNote
      Citation:
      Fu Cong, Song Zhitang, Chen Houpeng, Cai Daolin, Wang Qian, Hong Xiao, Ding Sheng, Li Xi. A novel low ripple charge pump with a 2X/1.5X booster for PCM[J]. Journal of Semiconductors, 2012, 33(9): 095001. doi: 10.1088/1674-4926/33/9/095001

      Fu C, Song Z T, Chen H P, Cai D L, Wang Q, Hong X, Ding S, Li X. A novel low ripple charge pump with a 2X/1.5X booster for PCM[J]. J. Semicond., 2012, 33(9): 095001. doi: 10.1088/1674-4926/33/9/095001.
      Export: BibTex EndNote

      A novel low ripple charge pump with a 2X/1.5X booster for PCM

      doi: 10.1088/1674-4926/33/9/095001
      Funds:

      Supported by National Key Basic Research Program of China(2010CB934300, 2011CBA00607, 2011CB932800), National Integrate Circuit Research Program of China (2009ZX02023-003), National Natural Science Foundation of China (60906004, 60906003, 61006087, 61076121), Science and Technology Council of Shanghai (1052nm07000)

      • Received Date: 2015-08-20
      • Accepted Date: 2012-03-14
      • Revised Date: 2012-04-11
      • Published Date: 2012-08-21

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