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This part is a TDK LDO (Low Dropout) Regulator, which is a voltage regulator that has a low drop-out voltage at its input and output. It features low noise, low drop-out voltage, low current consumption, and a built-in thermal shutdown function. This part is rated at 4.5V to 5.5V input and 3.3V output, with a maximum output current of 450mA.