Abstract
This paper presents a high reliability low dropout linear regulator with high voltage tolerance, which uses an open loop structure and is applied to the feedforward response portion of the power tube gate to enhance the transient response of the LDO. The proposed LDO is simulated using a 0.18um DTI isolated BCD process with a 3.3V-14V supply voltage, a maximum input voltage of 40V and an adjustable output voltage of 3.1V/5V. The line regulation is 0.086% at 40V high voltage input and the supply voltage rejection ratio of the circuit can be maintained at around 60dB.
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