A fast-transient high-performance 0.18μm CMOS LDO for battery-powered systems

What is it about?

This letter presents a low-power 0.18 μm CMOS capacitor-less Low-Dropout (LDO) Voltage Regulator for battery-operated portable devices. A high-gain telescopic cascode-compensated amplifier is used to attain a stable topology with good static performances, while a very simple dynamic biasing circuit significantly enhances transient performances with no quiescent current penalty. Post-layout results show a 1.8 V output voltage from a 3.6 V to 1.9 V battery input voltage, delivering a 50 mA load current over a 100 pF load. The quiescent current is only 7 μA, the line and load regulation are respectively 0.039 mV/V and 0.17 mV/mA, and settling times are lower than 3.9 μs at full load transient.

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