**ADP150AUJZ-8-R7: A Comprehensive Technical Overview of the Ultra-Low-Noise LDO Voltage Regulator**
In the realm of precision electronics, where clean and stable power is non-negotiable, the **Low-Dropout (LDO) voltage regulator** is a critical component. Among these, the ADP150AUJZ-8-R7 from Analog Devices stands out as a premier solution for applications demanding ultra-low noise and high power supply rejection. This article provides a deep technical dive into this exceptional regulator.
The ADP150 is designed to deliver a fixed **3.3V output** from an input voltage range of 2.5V to 5.5V, with a maximum output current of 150 mA. Its defining characteristic is its remarkably **low noise performance of 9 μV rms** (integrated from 10 Hz to 100 kHz). This is achieved through an innovative architecture that **minimizes inherent noise generation** without requiring a large external bypass capacitor, making it ideal for powering sensitive analog circuitry such as RF transceivers, precision sensors, high-fidelity audio components, and data converters (ADCs/DACs).
Another pivotal feature is its excellent **Power Supply Rejection Ratio (PSRR)**. The ADP150 maintains a high PSRR of up to 70 dB at 1 kHz, effectively filtering out ripples and noise from the upstream power supply, such as a switching regulator. This ensures that noise on the input rail does not propagate to the clean, regulated output, which is crucial in mixed-signal environments.
The device exhibits a low dropout voltage of **200 mV at 150 mA load**, allowing it to continue regulating effectively even when the input voltage dips very close to the output level. This enhances power efficiency and is particularly beneficial in battery-operated devices where maintaining regulation as the battery discharges is vital.
Housed in a compact, 5-lead TSOT package, the ADP150AUJZ-8-R7 offers a small footprint solution. Its stability is guaranteed with just a small 1.0 μF ceramic output capacitor, further saving valuable board space and bill-of-materials cost. The regulator also incorporates key protection features, including current limiting and thermal shutdown, safeguarding both the IC and the system it powers under fault conditions.
**ICGOOODFIND**: The ADP150AUJZ-8-R7 is an industry benchmark for ultra-low-noise power delivery. Its combination of **exceptional noise performance, high PSRR, and low dropout voltage** in a miniature package makes it an indispensable component for designers striving to achieve the highest levels of system performance and signal integrity in space-constrained, noise-sensitive applications.
**Keywords**: Ultra-Low Noise, High PSRR, LDO Voltage Regulator, 150 mA Output, Precision Analog Power.