Invited Paper: A 3∼45 V input and 3.1μ A quiescent current LDO with fast transient response for automotive electronics application

This paper presents a wide input and low power LDO with fast transient response for automotive electronic applications. This design employs impedance adaptive compensation and load pseudo-ESR zero tracking techniques, achieving excellent frequency and transient performance over a wide load range. The LDO chip is fabricated in a $0.18 \mu \mathrm{~m}$ BCD process. The measurement results show the input voltage range is from 3 V to 45 V, and the output voltage range is from 1.22 V to 5 V with a quiescent current of $3.1 \mu \mathrm{~A}$. The load regulation is 0.07 $\mathrm{mV} / \mathrm{mA}$ with the load steps from 1 mA to 300 mA. The power supply rejection ratio of the chip are 80 dB at 10 kHz and 20 dB at 1 MHz.