**ADP7182ACPZN-2R7: A High-Performance, Negative-Voltage LDO Regulator for Precision Analog Applications**

In the demanding world of precision analog circuitry, maintaining a clean, stable, and noise-free power supply is paramount. Sensitive components such as operational amplifiers, data converters (ADCs/DACs), and sensors are highly susceptible to power supply noise and fluctuations, which can severely degrade system performance by introducing errors, reducing dynamic range, and increasing distortion. To address these critical challenges, the **ADP7182ACPZN-2R7** emerges as a premier solution: a high-performance, negative-voltage low-dropout (LDO) regulator engineered specifically for the most noise-sensitive applications.

The ADP7182 is designed to convert a higher negative input voltage (e.g., -3.6V to -3.0V) to a tightly regulated, lower negative output voltage (e.g., -2.7V for the -2R7 variant) with exceptional accuracy. Its core strength lies in its **ultra-low noise performance of just 1.8 μV√Hz** and an outstanding **power supply rejection ratio (PSRR) of 80 dB at 10 kHz**. This combination ensures that the regulator itself introduces negligible noise and effectively blocks any ripple or noise originating from the upstream power supply, such as a switching DC-DC converter, from reaching the delicate analog load.

Beyond its noise performance, the ADP7182 boasts a **maximum dropout voltage of only 135 mV** at a 200 mA load. This low dropout characteristic is crucial for maximizing efficiency and extending battery life in portable instruments, as it allows the regulator to continue providing a stable output even when the input voltage is only slightly higher (in negative terms) than the desired output. Furthermore, the device incorporates advanced protection features, including current limiting and thermal shutdown, safeguarding both the regulator and the downstream circuitry under fault conditions.

Housed in a compact, space-saving 4 mm × 4 mm LFCSP package, the ADP7182ACPZN-2R7 is ideally suited for a wide array of high-precision applications. It is perfectly positioned to provide post-regulation for switching power supplies in medical imaging equipment, test and measurement instruments, industrial process control systems, and high-fidelity audio equipment. By ensuring a pristine negative supply rail, it enables 16-bit and higher-resolution ADCs and DACs to achieve their full performance potential, making it an indispensable component for design engineers focused on pushing the boundaries of analog signal integrity.

**ICGOOODFIND:** The ADP7182ACPZN-2R7 stands out as an elite negative-voltage LDO, delivering **exceptional noise performance and high PSRR** in a miniature footprint. It is the optimal choice for purifying negative supply rails in precision analog systems where every microvolt of noise matters.

**Keywords:** Ultra-low Noise, High PSRR, Negative Voltage, LDO Regulator, Precision Analog.