**ADM7172ACPZ-5-R7: A High-Performance, 5V Ultralow Noise LDO Voltage Regulator**

In the realm of precision electronics, power integrity is paramount. Noise, ripple, and instability in a power supply can severely degrade the performance of sensitive components like RF transceivers, high-resolution ADCs/DACs, and precision analog sensors. Addressing this critical need, the **ADM7172ACPZ-5-R7** from Analog Devices stands out as a premier solution: **a high-performance, 5V ultralow noise LDO (Low-Dropout) voltage regulator** engineered for the most demanding applications.

The core of the ADM7172's superiority lies in its exceptional noise performance. It achieves an **ultralow output noise of 1.6 μVrms** (typical from 10 Hz to 100 kHz), a figure that is virtually imperceptible and ensures a clean, stable DC voltage for noise-sensitive circuitry. This is accomplished through innovative design and the integration of a high-performance error amplifier, effectively minimizing the inherent noise generated by the internal reference. Furthermore, the regulator boasts an outstanding **power supply rejection ratio (PSRR) of 80 dB at 10 kHz**, enabling it to attenuate unwanted noise and ripple from the upstream switching regulator or power source dramatically. This combination of low self-noise and high noise rejection makes it an ideal post-regulator for cleaning up noisy intermediate power rails.

Beyond its acoustic quietness, the ADM7172 is a powerhouse of performance and reliability. It can deliver a robust **continuous output current of 2 A** with a typical dropout voltage of only 210 mV at full load. This high current capability and low dropout characteristic maximize efficiency and are crucial for powering modern FPGAs, ASICs, and processors that require substantial current at low voltages. The device operates over a wide input voltage range from 2.3 V to 6.5 V, providing significant design flexibility.

Stability and protection are also key features. The regulator is stable with a small, space-saving 4.7 μF ceramic output capacitor, simplifying board layout and reducing the overall bill of materials. It includes comprehensive protection features such as **current limit and thermal overload protection**, safeguarding both the regulator and the load it powers under fault conditions. Housed in a compact 8-lead LFCSP package, the ADM7172ACPZ-5-R7 offers this high level of integration in a minimal footprint, making it perfectly suited for space-constrained applications.

**ICGOO**DFIND: The ADM7172ACPZ-5-R7 is an exceptional ultralow noise LDO that sets a high bar for power delivery. Its best-in-class noise performance, superb PSRR, and high output current make it an indispensable component for designers striving to achieve maximum performance and signal fidelity in advanced communications infrastructure, test and measurement equipment, medical instrumentation, and aerospace systems.

**Keywords:**

* **Ultralow Noise**

* **High PSRR**

* **2A Output Current**

* **LDO Voltage Regulator**

* **Power Integrity**