In order to widen the input range and improve the transient response performance,a wide-input and transient-enhanced low dropout regulator(LDO)design is proposed to cope with the transient high-voltage and circuit dynamic changes that may occur when the power management chips in automotive electronics are applied in harsh electronic circuit environments.A pre-regulator circuit is used to convert the high input voltage into a low voltage supply to power the internal mod-ules of the circuit to realize wide-input.The dual regulator design of the main loop is used to speed up the loop response to output voltage changes by adding a fast response path,which is combined with a fast discharge circuit to realize a fast transient response.The loop stability under different band loads is ensured by the Miller zero-tuning compensation and zero compensation methods.Simu-lation results show that the input voltage range of the circuit can be realized from 3 V to 40 V,and the pre-regulator circuit can step down the high input voltage to 2.8 V;the typical value of the LDO output voltage is 5 V,and it can be loaded with a maximum of 150 mA;when the load current under-goes a 150 mA jump,the output overshoot and undershoot voltages are 40.32 mV and 55.77 mV,respectively.Compared with the existing related designs,the proposed design realizes a wider input range and also has a better transient response performance.
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