**Ultra-Low Noise ADP150AUJZ-3-R7 LDO Regulator: Powering Precision Analog and RF Systems**

In the demanding realm of precision analog and RF applications, the integrity of the power supply is paramount. Even the slightest perturbation or noise on the supply rail can degrade signal-to-noise ratios, introduce spurious signals, and compromise the performance of sensitive components like high-resolution ADCs/DACs, precision sensors, voltage-controlled oscillators (VCOs), and low-noise amplifiers (LNAs). The **ADP150AUJZ-3-R7** from Analog Devices stands out as a premier solution, engineered specifically to provide the **ultra-clean, stable power** these critical systems require.

This low-dropout (LDO) regulator is distinguished by its **exceptionally low output noise performance of just 9 μV√Hz** at a 100 kHz bandwidth. This remarkable characteristic ensures that the regulator itself contributes negligible acoustic noise to the power rail, preserving the fidelity of delicate signals. Furthermore, it boasts an outstanding **power supply rejection ratio (PSRR) of 70 dB at 10 kHz**, effectively acting as a barrier against noise and ripple originating from the upstream power supply, such as switch-mode power supplies (SMPS). This high PSRR allows designers to use efficient but noisy SMPS for bulk conversion, followed by the ADP150 for final, pristine regulation.

The ADP150AUJZ-3-R7 is a fixed-output voltage version set at 3.0V, capable of delivering up to 150 mA of output current with a very low dropout voltage of 180 mV. This balance of current capability and low dropout extends battery life in portable equipment and provides design flexibility in power sequencing. Its design ensures excellent line and load transient response, maintaining stability and a constant output voltage despite fluctuations in input voltage or output current demand.

Housed in a compact, 5-bump, 0.65 mm pitch WLCSP (Wafer Level Chip Scale Package), it is ideally suited for space-constrained PCB designs common in modern portable and high-density RF systems. The device is also protected by internal current limiting and thermal shutdown features, enhancing the reliability of the end application.

**ICGOOODFIND:** The ADP150AUJZ-3-R7 is an **ultra-low-noise linear regulator** that sets the benchmark for powering high-performance systems. Its best-in-class **noise and PSRR performance** make it an indispensable component for engineers designing precision instrumentation, medical devices, advanced communication systems, and any application where power purity is non-negotiable.

**Keywords:** Ultra-Low Noise, LDO Regulator, High PSRR, Precision Analog, RF Applications.