**ADP7156ACPZ-5-R7: A High-Performance, 5V Ultra-Low-Noise LDO Voltage Regulator**

In the realm of precision electronics, the integrity of power supply is paramount. Noise, ripple, and instability can severely degrade the performance of sensitive components such as RF transceivers, high-resolution ADCs/DACs, and precision sensors. Addressing this critical need, the **ADP7156ACPZ-5-R7** emerges as a premier solution: a **5V, ultra-low-noise, high-PSRR low-dropout (LDO) voltage regulator** engineered for the most demanding applications.

The ADP7156 is designed to deliver a fixed **5.0V output** from an input voltage range of 2.5V to 5.5V, with a maximum output current of 500 mA. Its standout feature is its exceptionally low output noise, which is rated at a mere **1.8 μV√Hz** (integrated from 100 Hz to 100 kHz). This ultra-low-noise performance is crucial for powering noise-sensitive circuitry without introducing additional interference that could compromise signal clarity and system accuracy.

Furthermore, the regulator boasts an outstanding **Power Supply Rejection Ratio (PSRR)** of up to 80 dB at 10 kHz. This high PSRR ensures that the ADP7156 effectively attenuates ripple and noise originating from the upstream switching power supply or other sources, providing a clean and stable output even in the presence of a noisy input rail.

**Key performance advantages include:**

* **Ultra-Low Output Noise:** Achieves **< 2 μV√Hz** with an optional external noise-reduction capacitor (CNR), making it ideal for analog and RF loads.

* **Exceptional High PSRR:** Maintains **> 60 dB** of rejection up to 1 MHz, effectively isolating the load from input disturbances.

* **High Accuracy:** The output voltage is accurate within ±1.5% over line, load, and temperature variations.

* **Compact Solution:** The 3 mm × 3 mm LFCSP package offers an excellent thermal performance-to-size ratio, which is vital for space-constrained PCB designs.

* **Full Protection:** The IC incorporates built-in protection features such as current limit and thermal shutdown, enhancing system reliability.

Typical applications span across a wide spectrum of high-performance equipment, including medical imaging systems, test and measurement instrumentation, wireless infrastructure, and high-speed data converters.

**ICGOOODFIND:** The ADP7156ACPZ-5-R7 stands out as a superior power management component, delivering an unparalleled combination of **ultra-low noise, high PSRR, and solid 500 mA output current** in a miniature package. It is an indispensable building block for designers who refuse to compromise on power quality for their most sensitive and critical circuits.

**Keywords:** Ultra-Low Noise, High PSRR, LDO Voltage Regulator, 5V Output, Power Management