## Overview of ADP151ACBZ-3.3-R7 The **ADP151ACBZ-3.3-R7** is an ultra-low noise, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed to operate with high efficiency in space-constrained applications, providing a stable fixed output voltage. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 3.3 V | | **Input Voltage Range** | 2.2 V to 5.5 V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 140 mV (at 200 mA load) | | **Quiescent Current (Low Load)** | 10 μA | | **PSRR (Power Supply Rejection Ratio)** | 70 dB at 10 kHz | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | --- ### Core Components and Features #### 1. Low Noise Operation One of the standout features of this part is its ultra-low noise performance (9 μV rms). This makes it ideal for powering sensitive analog components like ADCs, DACs, and precision amplifiers without requiring an external bypass capacitor. #### 2. Dropout Characteristics With a low dropout voltage of **140 mV**, the regulator can maintain a stable 3.3V output even when the battery or input source drops close to the target voltage, extending the usable life of battery-powered devices. #### 3. Control & Protection * **Enable (EN) Pin:** Allows the device to be turned off to save power; when disabled, the shutdown current drops to less than 1 μA. * **Internal Protection:** Includes thermal overload protection and short-circuit protection to prevent damage during fault conditions. * **Stability:** It is stable with small 1 μF ceramic input and output capacitors. --- ### Typical Application Circuit ```mermaid graph LR Vin[Input 2.2V-5.5V] --> Cin(1uF Cap) Cin --> LDO[ADP151] LDO --> Cout(1uF Cap) Cout --> Vout[Fixed 3.3V Output] EN[Enable Signal] --> LDO ``` ### Common Applications * Mobile phones and digital cameras. * Portable and battery-powered equipment. * Post-regulation for switching supplies. * RF and sensitive analog circuitry. ---