The Analog Devices LT3045IDD#PBF is an ultra-low noise, ultra-high PSRR (Power Supply Rejection Ratio) linear regulator. It is a LDO (low-dropout) voltage regulator with 20V output voltage and 500mA output current. It is designed to maintain high precision and accuracy over a wide range of temperatures and conditions. The device features high voltage range, low power consumption, low noise, fast transient response, and low output ripple. Additionally, its high PSRR allows for a wide input voltage range, from 3.3 to 20V. The LT3045IDD is ideal for use in communication, medical, industrial, and automotive applications.