**ADP122AUJZ-3-R7: A 300mA, Low-Quiescent Current, Low-Dropout Linear Regulator for Modern Portable Electronics**

In the rapidly evolving world of portable and battery-powered devices, power management is paramount. Efficient voltage regulation is critical to extending battery life and ensuring stable system performance. The **ADP122AUJZ-3-R7** from Analog Devices stands out as a premier solution, expertly balancing performance, efficiency, and a minimal footprint.

This low-dropout (LDO) linear regulator is designed to deliver a fixed **3.0V output** from an input voltage range of 2.2V to 5.5V, making it exceptionally versatile for a wide array of applications. Its core strength lies in its ability to provide a stable, clean output voltage with a maximum **output current of 300mA**, sufficient to power microcontrollers, sensors, and various peripheral circuits in compact designs.

A defining feature of the ADP122 is its remarkably **low quiescent current (IQ) of just 30 µA** at full load. This ultra-low IQ is a significant advantage for devices that spend a majority of their time in standby or sleep modes, as it drastically reduces the amount of charge drained from the battery when the system is idle. This directly translates to **longer battery life** and enhanced product usability.

Furthermore, the regulator exhibits a **low dropout voltage of 110 mV at 300 mA load**. This low dropout characteristic ensures that the regulator continues to provide a well-regulated output even as the input voltage dips very close to the output level, maximizing the use of the available battery energy, especially as it nears the end of its discharge cycle.

The device is also designed for simplicity and reliability. It requires only a small 1.0 µF ceramic output capacitor for stability, reducing the overall solution size and bill-of-materials cost. Key protection features such as **current limit and thermal overload protection** safeguard both the regulator and the downstream circuitry from fault conditions. Housed in a tiny 5-lead TSOT package, the ADP122AUJZ-3-R7 is an ideal choice for space-constrained PCB designs found in modern consumer, industrial, and medical portable equipment.

**ICGOOODFIND:** The ADP122AUJZ-3-R7 is an exceptional LDO regulator that masterfully combines **high efficiency, ultra-low power consumption, and robust performance** in a miniature package. It is an optimal choice for designers prioritizing extended battery life and board space savings without compromising on voltage regulation quality.

**Keywords:** Low Quiescent Current, Low-Dropout (LDO) Regulator, 300mA Output, Battery-Powered Devices, Voltage Regulation.