A 1.21V output, 100mA, 0.1μF-10μF output capacitor, ESR-independent, low voltage, low drop-out voltage regulator for portable power applications is designed and fabricated in a 0.5μm CMOS process with an area of 0.22 mm~2. The use of a wide-range output capacitor LDO enables reduced target system PCB size and Bill of Materials (BOM). A 0.05%/V line regulation, 0.001%/mA load regulation with 220mV drop-out is measured. LDO-specific pole-zero and optimal stability analyses are detailed.
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