SEMICONDUCTOR INTEGRATED CIRCUITS

A capacitor-free CMOS LDO regulator with AC-boosting and active-feedback frequency compensation

Zhou Qianneng, Wang Yongsheng and Lai Fengchang

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Abstract: A capacitor-free CMOS low-dropout (LDO) regulator for system-on-chip (SoC) applications is pre-sented. By adopting AC-boosting and active-feedback frequency compensation (ACB-AFFC), the proposed LDO regulator, which is independent of an off-chip capacitor, provides high closed-loop stability. Moreover, a slew rate enhancement circuit is adopted to increase the slew rate and decrease the output voltage dips when the load current is suddenly switched from low to high. The LDO regulator is designed and fabricated in a 0.6 μm CMOS process. The active silicon area is only 770 × 472 μm2. Experimental results show that the total error of the output voltage due to line variation is less than ±0.197%. The load regulation is only 0.35 mV/mA when the load current changes from 0 to 100 mA.

Key words: low-dropout regulator AC-boosting and active-feedback frequency compensation capacitor-free

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    Received: 18 August 2015 Revised: 13 December 2008 Online: Published: 01 April 2009

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      Zhou Qianneng, Wang Yongsheng, Lai Fengchang. A capacitor-free CMOS LDO regulator with AC-boosting and active-feedback frequency compensation[J]. Journal of Semiconductors, 2009, 30(4): 045006. doi: 10.1088/1674-4926/30/4/045006 Zhou Q N, Wang Y S, Lai F C. A capacitor-free CMOS LDO regulator with AC-boosting and active-feedback frequency compensation[J]. J. Semicond., 2009, 30(4): 045006. doi:  10.1088/1674-4926/30/4/045006.Export: BibTex EndNote
      Citation:
      Zhou Qianneng, Wang Yongsheng, Lai Fengchang. A capacitor-free CMOS LDO regulator with AC-boosting and active-feedback frequency compensation[J]. Journal of Semiconductors, 2009, 30(4): 045006. doi: 10.1088/1674-4926/30/4/045006

      Zhou Q N, Wang Y S, Lai F C. A capacitor-free CMOS LDO regulator with AC-boosting and active-feedback frequency compensation[J]. J. Semicond., 2009, 30(4): 045006. doi:  10.1088/1674-4926/30/4/045006.
      Export: BibTex EndNote

      A capacitor-free CMOS LDO regulator with AC-boosting and active-feedback frequency compensation

      doi: 10.1088/1674-4926/30/4/045006
      • Received Date: 2015-08-18
      • Accepted Date: 2008-09-01
      • Revised Date: 2008-12-13
      • Published Date: 2009-04-07

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