**ADP223ACPZ-R7: A Comprehensive Technical Overview of Analog Devices' 200mA, Low Noise, Linear Regulator**

The ADP223ACPZ-R7 from Analog Devices represents a significant advancement in power management technology, offering a compact and highly efficient solution for noise-sensitive applications. As a 200mA, low-dropout (LDO) linear regulator, it is engineered to deliver exceptional performance where clean, stable voltage is paramount. This article delves into the key technical attributes and potential applications of this sophisticated component.

**Core Architecture and Performance**

At the heart of the ADP223ACPZ-R7 is a precision architecture designed for **ultra-low noise performance**, typically measuring just **9.8μV rms** (10Hz to 100kHz). This makes it an indispensable component for powering sensitive analog and RF circuits, such as those found in high-fidelity audio equipment, precision instrumentation, and wireless communication systems. The device also features an impressively **low dropout voltage of 110mV at 200mA**, maximizing efficiency and extending battery life in portable devices by allowing operation with a smaller difference between input and output voltages.

**High Power Supply Rejection Ratio (PSRR)**

A standout feature of this LDO is its **exceptional Power Supply Rejection Ratio (PSRR)**, which exceeds 70dB at 1kHz. This high PSRR effectively blocks unwanted noise and ripple from upstream switching regulators or other noisy power sources, ensuring a clean and stable output voltage. This capability is critical in mixed-signal environments where digital noise can severely degrade the performance of analog circuitry.

**Integration and Flexibility**

Housed in a tiny **2mm x 2mm, 8-lead LFCSP package**, the ADP223ACPZ-R7 is built for space-constrained PCB designs. It integrates the feedback resistors, setting the output voltage to a fixed 3.3V, which simplifies design and reduces the external component count. For design flexibility, the device includes both an **enable (EN) pin** and a **power-good (PG) output**. The EN pin allows for external on/off control, facilitating sophisticated power sequencing, while the PG signal provides a digital flag to the host microcontroller once the output voltage is within regulation, enhancing system reliability.

**Protection and Reliability**

Analog Devices has equipped this regulator with robust protection features to ensure system safety. These include **internal current limiting** and **thermal overload protection**, which safeguard the IC and the load from damage during fault conditions such as short circuits or excessive power dissipation.

**ICGOOODFIND**

The ADP223ACPZ-R7 is a superior choice for designers seeking a high-performance, low-noise power solution. Its combination of ultra-low noise, high PSRR, low dropout voltage, and integrated features in a miniature package makes it ideally suited for a wide range of applications, from portable medical devices and test equipment to IoT sensors and communication infrastructure.

**Keywords:** Low Noise LDO, High PSRR, Low Dropout Voltage, 200mA Linear Regulator, Power Management IC