**ADP170AUJZ-5-R7: A 300mA, Low-Quiescent Current, High-PSRR CMOS Linear Regulator**

In the realm of power management for portable and noise-sensitive applications, the **ADP170AUJZ-5-R7** stands out as a highly integrated, precision CMOS linear regulator. Engineered to deliver a fixed 5.0V output from an input voltage range of 2.5V to 5.5V, this regulator is a cornerstone for powering critical subsystems where clean, stable voltage is non-negotiable.

The defining characteristic of this device is its exceptional combination of a **very low 1.3 µA quiescent current** and a **high power supply rejection ratio (PSRR)** of 70 dB at 1 kHz. The ultra-low quiescent current is paramount for extending battery life in always-on applications, such as real-time clocks (RTCs), sensor modules, and portable medical devices, where every microamp of current drain counts. Simultaneously, the **excellent PSRR performance** ensures that the regulator effectively attenuates ripples and noise from the input power source, such as a noisy switching regulator or a battery with fluctuating voltage. This makes it an ideal post-regulator for sensitive analog circuitry, including RF modules, precision sensors, and audio components, protecting them from performance-degrading power supply noise.

Beyond its core specifications, the ADP170AUJZ-5-R7 offers a robust feature set. It provides a **maximum output current of 300 mA**, sufficient for a wide array of low-power processors and peripheral ICs. The device incorporates **current limiting and thermal overload protection** mechanisms, safeguarding both the regulator and the load under fault conditions. Its CMOS construction and low dropout voltage of 185 mV (typical at 300 mA load) further enhance its efficiency, allowing it to operate effectively even as the input voltage approaches the output level. Housed in a compact 5-bump WLCSP package, it is perfectly suited for space-constrained PCB designs.

**ICGOODFIND:** The ADP170AUJZ-5-R7 is an optimal solution for designers seeking to maximize battery runtime and minimize noise in their systems. Its unparalleled blend of **ultra-low quiescent current** and **superior noise rejection** positions it as a top-tier choice for powering the always-on, noise-sensitive portions of modern electronic devices.

**Keywords:**

* **Low Quiescent Current**

* **High PSRR**

* **CMOS Linear Regulator**

* **300mA Output**

* **Battery-Powered Applications**