**ADP1707ARDZ-5-R7: A 5V, 300mA Ultralow Noise CMOS LDO Linear Regulator**

In the realm of power management, achieving clean and stable voltage regulation is paramount for sensitive analog and RF circuits. The **ADP1707ARDZ-5-R7** from Analog Devices stands out as a premier solution, engineered to deliver exceptional performance where low noise and high power supply rejection are critical.

This CMOS low-dropout (LDO) linear regulator is designed to provide a **fixed 5V output** from an input voltage range of 2.5V to 5.5V, making it ideal for post-regulation from intermediate bus voltages or for use in battery-powered systems. Its capability to supply up to **300mA of continuous output current** supports a wide array of applications, from powering high-performance audio amplifiers and precision sensors to serving as the core voltage supply for FPGAs, ASICs, and RF transceivers.

A defining characteristic of the ADP1707 is its **ultralow output noise performance of 9 μV√Hz**. This exceptionally quiet operation is crucial for minimizing phase noise in oscillators and clocking circuits, and for preserving signal integrity in data acquisition systems. Furthermore, it boasts an outstanding **power supply rejection ratio (PSRR) of 70 dB at 1 kHz**, effectively attenuating unwanted ripple and noise from the input supply, which is a common challenge in noisy digital environments.

The device incorporates advanced protection features, including **current limiting and thermal shutdown**, ensuring safe operation under fault conditions. Its compact, 4-ball WLCSP package offers a minimal footprint, which is highly advantageous for space-constrained PCB designs. With a low dropout voltage of 110 mV at 150 mA load, it also maintains high efficiency across its operating range.

ICGOODFIND: The ADP1707ARDZ-5-R7 is a superior choice for designers seeking a high-performance, ultralow noise LDO. Its combination of **excellent noise performance, high PSRR, and robust protection** makes it an indispensable component for enhancing the performance and reliability of noise-sensitive electronic systems.

**Keywords:** Ultralow Noise, LDO Linear Regulator, Power Supply Rejection Ratio (PSRR), 300mA Output Current, CMOS