Design of self-referenced wide input voltage range LDO using enhanced current mirror buffer and improved lead compensation

This letter presents the self-referenced architecture to simplify designprocessandcurrentmirrorbasedpowerstagewithwideinputvoltagetoexpandtheapplicationrangeoflow-dropout(LDO)regulator.Featur-ingaBiCMOSsymmetricaloperationaltransconductanceamplifier(OTA)whoseinputandpowersupplyarealsotheoutputofLDO,theLDOitselfisavoltagereferenceaswellasavoltageregulator.Improvedphaseleadcompensationisappliedwithmuchsmallercompensationcapacitor,andenhancedcurrentmirror(ECM)bufferisintroduced.ExperimentalresultsoftheproposedLDOina0.18 (cid:22) mBCDprocessverifiedthisself-referenced structure. The measured maximum input voltage is 12 V and the power supply rejection (PSR) is (cid:0) 40 dB at 50 KHz. The line regulation is 0.34 mV/V and total quiescent current is about 8.2 (cid:22) A at light load.

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