In the realm of power management, the demand for clean, stable, and efficient voltage regulation is paramount, especially for noise-sensitive applications like RF transceivers, precision sensors, and audio equipment. The **ADP151AUJZ-8-R7** from Analog Devices stands out as a premier solution, engineered to meet these critical demands. This article provides a detailed technical examination of this high-performance, low-dropout (LDO) voltage regulator.

The ADP151 is a CMOS LDO regulator capable of delivering up to **200 mA of output current** with an exceptionally low dropout voltage. The specific part number "ADP151AUJZ-8-R7" denotes a device with a fixed **3.3 V output voltage**, housed in a compact 5-lead TSOT package, and supplied on a 7-inch reel. Its core architecture is built on CMOS technology, which is fundamental to its superior performance characteristics.

One of the most defining features of the ADP151 is its ultra-low noise performance. It achieves a remarkably **low output noise of just 9 μV√Hz** (integrated from 10 Hz to 100 kHz), which is crucial for powering sensitive analog and RF circuitry without degrading their signal integrity. This is complemented by an outstanding **power supply rejection ratio (PSRR)** of up to 70 dB at 10 kHz. This high PSRR ensures the regulator effectively attenuates ripples and noise from the input supply, providing a clean and stable output even when the input is noisy.

Despite its high performance, the ADP151 is designed for efficiency. Its low dropout voltage of **115 mV at 200 mA load** (for the 3.3V output version) maximizes efficiency and extends battery life in portable applications by allowing operation with a input voltage that is only slightly above the output. Furthermore, the quiescent current is a mere 30 μA, which remains stable across load and line variations, minimizing its own power consumption.

The device incorporates essential protection features for robust operation, including **current limit and thermal shutdown** circuits. These safeguards protect the regulator and the downstream load from damage under fault conditions such as short circuits or excessive power dissipation. The ADP151 is also stable with a small, space-saving 1.0 μF ceramic output capacitor, making it an ideal choice for modern, miniaturized PCB designs.

**ICGOODFIND**: The ADP151AUJZ-8-R7 is an exceptional component for designers seeking a combination of ultra-low noise, high PSRR, and efficiency in a miniature package. Its performance specs make it a top-tier choice for critical analog and RF power rails in applications ranging from medical devices and test equipment to communication infrastructure and consumer audio.

**Keywords**: **Low-Noise LDO**, **High PSRR**, **200 mA Output Current**, **CMOS Voltage Regulator**, **Ultra-Low Dropout Voltage**