## Detailed Overview of the ADP151ACBZ-2.85-R7 The **ADP151ACBZ-2.85-R7** is a high-performance, ultra-low noise, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed to operate in space-constrained applications that require high power supply rejection and low noise performance. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Output Voltage** | 2.85 V (Fixed) | | **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 (No Load)** | 10 µA | | **PSRR (Power Supply Rejection Ratio)** | 70 dB at 10 kHz | | **Output Noise** | 9 µV rms (10 Hz to 100 kHz) | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | --- ### 2. Core Features & Benefits * **Ultra-Low Noise:** The 9 µV rms noise floor makes it ideal for noise-sensitive analog and RF circuits (like VCOs or ADCs). * **High PSRR:** Effectively filters out ripples from switching power supplies, ensuring a clean stable DC output. * **Low Quiescent Current:** At only 10 µA during operation and less than 1 µA in shutdown mode, it significantly extends battery life in portable devices. * **Stability:** It is designed for stable operation with tiny 1 µF ceramic input and output capacitors. * **Protection Circuitry:** Includes internal thermal overload protection and short-circuit protection. --- ### 3. Pin Configuration (WLCSP) The device uses a compact 4-ball grid arrangement: | Ball | Symbol | Description | | :--- | :--- | :--- | | **A1** | **VIN** | Regulator Input Supply. | | **A2** | **VOUT** | Regulated Output Voltage. | | **B1** | **EN** | Enable Input. High = On, Low = Off. | | **B2** | **GND** | Ground Reference. | --- ### 4. Typical Applications * Mobile phones and smartphones. * Digital cameras and audio equipment. * Portable Medical devices. * Post-regulation for DC-to-DC converters. * RF and wireless modules. --- ### 5. Part Number Breakdown * **ADP151:** Base model (Ultra-low noise LDO). * **ACBZ:** Package code (WLCSP). * **2.85:** Fixed output voltage (2.85 Volts). * **R7:** Tape and Reel packaging (7-inch reel). ---