**ADP225ACPZ-R7: A 2A, 5V Ultralow Noise CMOS Linear Regulator for High-Performance Systems**
In the realm of high-performance electronic systems, power integrity is paramount. Noise, ripple, and transient response from the power supply can critically degrade the performance of sensitive analog and RF circuits, high-speed data converters, and precision measurement instruments. Addressing this challenge head-on, the **ADP225ACPZ-R7** emerges as a premier solution: **a 2A, 5V ultralow noise CMOS linear regulator** engineered to deliver pristine, stable power.
The core strength of the ADP225 lies in its exceptional noise performance. Unlike switching regulators which generate inherent ripple and noise, linear regulators provide a clean output by nature. The ADP225 elevates this further, achieving an **ultralow output noise of just 6.5µVRMS** (typical, 10 Hz to 100 kHz). This is accomplished through advanced design and the integration of a high-performance bandgap reference, making it an ideal power source for the most demanding noise-sensitive applications, such as powering PLLs, VCOs, LNAs, and high-resolution ADCs/DACs.
Beyond its quiet operation, the regulator is capable of delivering up to **2A of continuous output current** with a fixed 5.0V output. Despite being a linear regulator, it boasts a remarkably **low dropout voltage of only 130mV at 2A**, a critical feature for maximizing efficiency and headroom in systems where the input voltage is not significantly higher than the output. This is particularly beneficial in multi-rail systems powered from a common intermediate bus voltage.
The device is built on a CMOS process, which contributes to its high power supply rejection ratio (PSRR)—**75dB at 1kHz**—effectively blocking unwanted noise from upstream power stages. Its excellent line and load regulation ensure a stable 5V output despite fluctuations in input voltage or output current. For system reliability, the ADP225ACPZ-R7 includes essential protection features like **internal current limiting and thermal shutdown**.
Housed in a compact, low-profile 3mm x 3mm LFCSP package, it offers an excellent solution for space-constrained PCBs without compromising on power delivery or thermal performance when paired with an appropriate PCB layout.
**ICGOODFIND**: The ADP225ACPZ-R7 stands out as a superior power management IC, masterfully balancing high current delivery, ultralow noise, and excellent PSRR. It is an indispensable component for designers aiming to achieve the highest possible system performance in advanced communications infrastructure, test and measurement equipment, and medical imaging systems.
**Keywords**: Ultralow Noise, CMOS Linear Regulator, 2A Output Current, High PSRR, Power Integrity.
