**ADP7182ACPZ-0-R7: A Comprehensive Technical Overview of the -0V, 200 mA Low-Noise Linear Regulator**

In the realm of precision analog and RF systems, power supply integrity is paramount. The ADP7182ACPZ-0-R7 from Analog Devices stands out as a critical component engineered to meet the stringent demands of noise-sensitive applications. This article provides a detailed technical examination of this high-performance, negative-voltage linear regulator.

The ADP7182 is a **low-noise, low-dropout (LDO) linear regulator** designed to deliver a fixed -5V output from a more negative input voltage (e.g., -5.5V to -3.0V). The "0-R7" suffix in the part number denotes the tape and reel packaging for high-volume assembly. Its primary function is to provide a clean, stable, and precisely regulated negative supply rail, which is essential for powering sensitive components like RF mixers, operational amplifiers, and data converters (DACs/ADCs) in applications ranging from test and measurement equipment to medical imaging and wireless infrastructure.

A defining characteristic of the ADP7182 is its **exceptionally low output noise performance**. It achieves a mere **1.8 μV√Hz** of noise at 10 kHz and **9 μV rms** of integrated output noise from 10 Hz to 100 kHz. This ultra-low noise is crucial for preserving signal integrity and maximizing the dynamic range and performance of the downstream circuitry it powers. Furthermore, it offers an outstanding **75 dB power supply rejection ratio (PSRR)** at 10 kHz, effectively blocking any noise or ripple present on the input voltage rail from passing through to the output. This combination makes it an ideal filter and regulator for noisy intermediate bus voltages.

Despite its high performance, the device is remarkably compact and easy to implement. Housed in a space-saving **8-lead, 2 mm × 2 mm LFCSP package**, it is suitable for densely populated PCBs. The regulator features a wide input voltage range from -2.7 V to -5.5 V and provides a **guaranteed output current of 200 mA** with a typical dropout voltage of only 115 mV. Key protection features such as **current limiting and thermal shutdown** are integrated, safeguarding the regulator and the load under fault conditions. Stability is ensured with a small, low-ESR 1 μF ceramic output capacitor, simplifying the bill of materials.

In practice, the ADP7182 is often deployed to generate a clean negative bias for high-speed amplifiers or to provide a stable negative supply for GaN (Gallium Nitride) gate drivers. Its ability to reject high-frequency noise makes it particularly valuable in the final stage of a power delivery network (PDN), positioned immediately before the point-of-load (PoL) to act as a silent, precise power source.

**ICGOOODFIND:** The ADP7182ACPZ-0-R7 is a premier solution for applications demanding a pristine negative voltage rail. Its unparalleled combination of **ultra-low noise, high PSRR, and robust 200 mA output current** in a miniature package establishes it as a cornerstone component for designers striving to achieve the highest levels of system performance and signal fidelity.

**Keywords:**

* **Low-Noise LDO**

* **Negative Voltage Regulator**

* **High PSRR**

* **200 mA Output Current**

* **RF/Analog Power Supply**