**ADM7170ACPZ-5-R7: A 5V, 2A Ultra-Low Noise High PSRR LDO Voltage Regulator**

In the world of high-performance electronics, the integrity of power supply rails is paramount. Sensitive components like RF transceivers, high-resolution ADCs/DACs, and precision analog circuits demand a clean, stable voltage source, free from the noise and ripple inherent in system power supplies. This is where the **ADM7170ACPZ-5-R7** from Analog Devices establishes itself as a premier solution, combining high current delivery with exceptional noise and rejection performance.

The ADM7170 is a CMOS, low dropout (LDO) linear voltage regulator designed to deliver a fixed **5V output from an input supply ranging from 2.3V to 6.5V**. Its ability to provide up to **2A of continuous output current** makes it suitable for powering a wide array of demanding loads, from FPGAs and ASICs to multiple analog channels simultaneously.

What truly distinguishes this regulator is its **ultra-low output noise performance of 3.8μVrms** (typical, 10Hz to 100kHz). This exceptional characteristic is crucial for applications where power supply-induced noise can directly degrade system performance, such as in communication systems, medical imaging equipment, and test and measurement instrumentation. By minimizing added noise, the ADM7170 ensures that dynamic range and signal clarity are preserved.

Complementing its low-noise property is an outstanding **Power Supply Rejection Ratio (PSRR) of 80dB at 10kHz**. This metric defines the LDO's ability to reject ripples and noise coming from its input source, such as a switching regulator preceding it in the power chain. The remarkably high PSRR effectively creates a "quiet zone," shielding the sensitive load from upstream power disturbances and simplifying overall power architecture design.

The device features a low dropout voltage of 185mV at 2A, enhancing efficiency and allowing operation with a input voltage closer to the 5V output. It is equipped with comprehensive protection features, including **current limit and thermal overload protection**, ensuring safe and reliable operation under fault conditions. The ADM7170ACPZ-5-R7 comes in a compact, low-thermal-resistance 8-lead LFCSP package, which is essential for managing heat dissipation in space-constrained applications.

**ICGOOODFIND**: The ADM7170ACPZ-5-R7 is an exceptional LDO voltage regulator that sets a high benchmark for powering noise-sensitive applications. Its powerful combination of **high current (2A), ultra-low noise (3.8μVrms), and excellent PSRR (80dB)** makes it an indispensable component for designers striving to achieve the highest levels of system performance and signal integrity.

**Keywords**: Ultra-low Noise, High PSRR, 2A Output Current, LDO Voltage Regulator, Power Supply Rejection