In the realm of power management, where stability and precision are paramount, low-dropout (LDO) regulators play a critical role. The **ADP7118AUJZ-R7** from Analog Devices stands out as a premier solution for applications demanding clean, accurate, and quiet power from a noisy or fluctuating input source. This article provides a detailed analysis of this high-performance component.

The ADP7118 is a high-voltage, high-PSRR (Power Supply Rejection Ratio), CMOS LDO regulator designed to deliver a fixed output voltage of up to 20V with a maximum output current of 200mA. Its exceptional ability to operate with a very low dropout voltage—only 200mV at 200mA load—makes it exceptionally efficient, even when the input voltage is only marginally higher than the output. This feature is crucial for battery-powered systems and energy-sensitive applications.

A defining characteristic of the ADP7118AUJZ-R7 is its **exceptional noise performance and high PSRR**. It boasts a PSRR of up to 72 dB at 10 kHz, effectively acting as a very effective low-pass filter. This means it can suppress unwanted noise and ripple from upstream switching regulators or other noisy power sources, ensuring a pristine DC voltage is delivered to sensitive load components like analog-to-digital converters (ADCs), digital-to-analog converters (DACs), RF transceivers, and precision sensors.

The device is engineered for **superior accuracy and stability**. It features a tight initial accuracy of ±0.8% at 25°C and maintains excellent load and line regulation over its entire operating temperature range (-40°C to +125°C). Stability is ensured with a small, space-saving 1 µF ceramic output capacitor, simplifying board design and reducing the overall bill of materials (BOM).

Housed in a compact 5-lead TSOT package, the **ADP7118AUJZ-R7 offers a compelling combination of performance and miniaturization**. Its small footprint is ideal for densely populated PCBs found in modern industrial, instrumentation, healthcare, and communications equipment. The inclusion of essential protection features, such as current limiting and thermal shutdown, safeguards the regulator and the downstream circuitry under fault conditions, enhancing system reliability.

**ICGOO**DFIND: The ADP7118AUJZ-R7 is a top-tier LDO regulator that excels in providing a clean, stable, and precise voltage rail from a noisy input. Its **best-in-class PSRR, low noise output, and high accuracy** make it an indispensable component for powering noise-sensitive subsystems, ensuring optimal performance and signal integrity in demanding applications.

**Keywords**: High PSRR, Low Noise LDO, Precision Voltage Regulation, 20V LDO Regulator, Analog Devices ADP7118.