SEMICONDUCTOR INTEGRATED CIRCUITS
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
| 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
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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.
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