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Full On-Chip CMOS Low-Dropout Voltage Regulator

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3 Author(s)
Milliken, R.J. ; Texas A&M Univ., College Station ; Silva-Martinez, J. ; Sanchez-Sinencio, E.

This paper proposes a solution to the present bulky external capacitor low-dropout (LDO) voltage regulators with an external capacitorless LDO architecture. The large external capacitor used in typical LDOs is removed allowing for greater power system integration for system-on-chip (SoC) applications. A compensation scheme is presented that provides both a fast transient response and full range alternating current (AC) stability from 0- to 50-mA load current even if the output load is as high as 100 pF. The 2.8-V capacitorless LDO voltage regulator with a power supply of 3 V was fabricated in a commercial 0.35-mum CMOS technology, consuming only 65 muA of ground current with a dropout voltage of 200 mV. Experimental results demonstrate that the proposed capacitorless LDO architecture overcomes the typical load transient and ac stability issues encountered in previous architectures.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:54 ,  Issue: 9 )