**ADP150ACBZ-85R7: A Comprehensive Technical Overview of the Ultra-Low Noise LDO Voltage Regulator**
In the realm of precision electronics, where clean and stable power is non-negotiable, the **ADP150ACBZ-85R7** stands out as a premier solution. This ultra-low dropout (LDO) linear voltage regulator from Analog Devices is engineered to deliver exceptional performance for noise-sensitive applications, combining high power supply rejection with remarkably low noise output.
**Core Architecture and Operating Principles**
The ADP150 is a CMOS-based LDO, a design choice that is fundamental to its superior performance. Unlike traditional bipolar LDOs, which can suffer from higher noise due to the base current noise of the PNP pass transistor, the CMOS architecture of the ADP150 utilizes a PMOS pass element. This structure inherently contributes **ultra-low noise performance** without requiring a separate bypass capacitor on the reference input, which is often a necessity in bipolar designs. The device operates with a very low dropout voltage—as low as 180 mV at a 150 mA load—enabling it to regulate an output voltage very close to its input supply, which is critical for improving efficiency in battery-powered systems.
**Key Performance Characteristics**
The defining feature of the ADP150ACBZ-85R7 is its exceptional noise performance. It boasts an **ultra-low output noise of just 9 μV√Hz** (typical at 10 kHz) and a wideband noise spectral density of only 9 nV/√Hz. This makes it an ideal power source for analog-to-digital converters (ADCs), digital-to-analog converters (DACs), precision sensors, voltage-controlled oscillators (VCOs), and RF components like PLLs and mixers, where even minor power rail perturbations can degrade signal integrity and overall system performance.
Complementing its low noise is an outstanding **power supply rejection ratio (PSRR)**. The ADP150 achieves a PSRR of up to 72 dB at 1 kHz, effectively filtering out ripples and noise from the upstream switching regulator or power supply. This high PSRR remains robust across a wide frequency range, ensuring clean power even in electrically noisy environments.
The part number "ADP150ACBZ-85R7" specifies its critical parameters: it is the fixed 5.0V output version (85R7 denotes 8.57, signifying 8.57V, which is a common code for 5.0V). It offers a maximum output current of 150 mA and is housed in a space-saving, low-profile 4-ball WLCSP package, making it suitable for compact, portable designs.
**Application Advantages and Considerations**
The integration of the ADP150 into a system is straightforward. It requires only small ceramic input and output capacitors (1 μF and 1 μF, respectively) for stability, minimizing the total solution footprint and Bill-of-Materials (BOM) cost. Its low quiescent current of 17 μA (typical) is a significant advantage for always-on, battery-powered applications, helping to extend battery life. Designers must ensure that the input voltage remains within the specified absolute maximum ratings and that the device is operated within its junction temperature limits, paying careful attention to thermal management under full load conditions.
**ICGOODFIND Summary**
The **ADP150ACBZ-85R7** is a benchmark for ultra-low noise voltage regulation. Its CMOS architecture delivers industry-leading noise and PSRR performance in a miniature package, providing designers with a reliable and efficient solution to safeguard the performance of their most sensitive analog and RF circuits. Its combination of low dropout voltage, low quiescent current, and minimal external component requirement makes it an exceptionally versatile and powerful component for advanced electronic systems.
**Keywords: Ultra-low Noise, LDO Voltage Regulator, High PSRR, ADP150, Precision Analog Power**
