**ADP1712AUJZ-3-R7: A 150mA, Low-Noise, Low-Dropout Linear Regulator in an Ultra-Small Package**

In the world of portable electronics, IoT devices, and sensitive analog circuits, the demand for efficient, compact, and clean power management is paramount. The **ADP1712AUJZ-3-R7** from Analog Devices stands out as a critical component designed to meet these exacting requirements. This low-dropout (LDO) linear regulator delivers a stable, fixed 3.0V output with a maximum current of **150mA**, all while housed in an **ultra-small 0.4mm x 0.4mm WLCSP package**.

The defining characteristic of the ADP1712 is its exceptionally **low noise performance of 9µVrms**, making it an ideal choice for powering noise-sensitive components such as RF transceivers, precision sensors, audio codecs, and VCOs (Voltage-Controlled Oscillators). This low noise is achieved without the need for an external bypass capacitor, simplifying board design and saving valuable space. Furthermore, it features an impressive **power supply rejection ratio (PSRR)** of up to 70dB at 1kHz, effectively filtering out ripple and noise from the preceding power stage (e.g., a switching regulator), ensuring a clean and stable output even from a noisy input source.

Another key advantage is its **low dropout voltage of 110mV at 150mA load**. This allows the regulator to maintain regulation with a very small voltage difference between the input and output, enabling operation down to a minimal input voltage and thus enhancing overall system efficiency, especially in battery-powered applications where every millivolt counts.

Despite its minuscule size, the ADP1712 is packed with robust protection features, including **current limiting and thermal shutdown**, which safeguard both the regulator and the downstream circuitry under fault conditions. Its wide input voltage range of 2.25V to 5.5V makes it versatile for use with various power sources, from multi-cell alkaline batteries to single-cell Li-Ion packs and standard 3.3V/5V rails.

**ICGOODFIND**: The ADP1712AUJZ-3-R7 is a powerhouse in a pinhead-sized package, offering an exceptional combination of **low noise, high PSRR, and low dropout voltage**. It is the optimal solution for designers tackling the challenges of space-constrained, battery-operated, and performance-sensitive applications where clean and reliable power is non-negotiable.

**Keywords**: Low-Dropout (LDO) Regulator, Low Noise, Ultra-Small Package, High PSRR, 150mA Output Current.