**ADP151ACBZ-8-R7: A Comprehensive Technical Overview of the 200 mA, Low-Noise CMOS LDO Voltage Regulator**

In the realm of power management for sensitive electronic equipment, the **Low-Dropout (LDO) voltage regulator** is a cornerstone component. Among these, the ADP151ACBZ-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 detailed technical examination of this advanced regulator.

The ADP151 is a **CMOS-based LDO** capable of delivering a maximum output current of 200 mA from a wide input voltage range of 2.2 V to 5.5 V. Its defining feature is its remarkably **low output noise performance of 9 μV√Hz**, a critical parameter for powering noise-sensitive components like RF transceivers, precision analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and oscillators in communication systems, medical instrumentation, and test and measurement equipment.

A key to its performance is its **high Power Supply Rejection Ratio (PSRR)**, which exceeds 70 dB at 1 kHz. This exceptional PSRR allows the ADP151 to effectively attenuate unwanted ripple and noise from the input power supply, ensuring a clean and stable output voltage even when the input is contaminated by noise from preceding switching regulators or other sources.

The device offers a fixed output voltage of 1.8 V (denoted by the `-8` in its part number) with an accuracy of ±1.5%. It utilizes a precision voltage reference and feedback loop to maintain this regulated output with a low dropout voltage of typically 135 mV at the full 200 mA load. This efficiency in headroom management is vital for battery-powered applications, maximizing operational life.

The ADP151ACBZ-8-R7 is presented in a compact, 5-lead TSOT package, making it suitable for space-constrained PCB designs. It incorporates essential protection features such as **current limit and thermal shutdown**, safeguarding both the regulator and the load under fault conditions. Its stable operation is guaranteed with a small, low-ESR ceramic output capacitor of just 1 μF, further reducing the solution footprint and bill-of-materials cost.

**ICGOOODFIND**: The ADP151ACBZ-8-R7 is an exemplary ultra-low-noise LDO regulator that delivers exceptional noise and PSRR performance. Its combination of high performance, integration, and small form factor makes it an **ideal power solution for the most demanding analog and RF subsystems**.

**Keywords**: **Low-Dropout (LDO) Regulator**, **Ultra-Low Noise**, **High PSRR**, **CMOS Technology**, **200 mA Output Current**.