The **ADP151ACBZ-1.8-R7** is a high-performance, ultra-low noise, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed to provide a stable 1.8V output for noise-sensitive analog and mixed-signal applications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Output Voltage** | 1.8V (Fixed) | | **Input Voltage Range** | 2.2V to 5.5V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 140 mV (at 200 mA load) | | **Quiescent Current** | 10 µA (Ground current at no load) | | **PSRR** | 70 dB at 10 kHz | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Detailed Pin Configuration The device uses a tiny 4-ball WLCSP footprint (approximately 0.8mm x 0.8mm), which is ideal for space-constrained mobile devices. * **VIN (Ball A1):** Regulator Input Supply. * **VOUT (Ball A2):** Regulated Output Voltage (1.8V). * **EN (Ball B1):** Enable Input. Drive high to turn on the device; drive low to enter shutdown mode. * **GND (Ball B2):** Ground reference. --- ### 3. Core Features and Benefits #### A. Ultra-Low Noise Performance The ADP151 is engineered to produce very low output noise (typically 9 µV rms). This makes it suitable for powering sensitive components like: * Phase-Locked Loops (PLLs) * Voltage-Controlled Oscillators (VCOs) * High-performance ADCs/DACs #### B. High Power Supply Rejection Ratio (PSRR) With a PSRR of 70 dB, the device is excellent at filtering out "ripple" or noise coming from the primary power supply (such as a switching DC-DC converter), ensuring a clean 1.8V rail. #### C. Power Efficiency The low dropout voltage (140mV) allows the regulator to maintain a stable 1.8V even when the battery voltage drops close to the output level, extending battery life in portable electronics. --- ### 4. Typical Application Circuit The ADP151 requires minimal external components to function reliably. ```text Input (2.2V - 5.5V) ----[ CIN: 1uF ]---- VIN [ ADP151 ] VOUT ----[ COUT: 1uF ]---- Output (1.8V) EN GND | | (Logic High) (System Ground) ``` **Notes on Capacitors:** * **CIN:** A 1 µF ceramic capacitor is recommended to improve transient response. * **COUT:** A 1 µF ceramic capacitor is required for stability. The device is stable with very small capacitors, which saves PCB space. --- ### 5. Ordering Information Decoded The suffix **-R7** indicates the packaging format: * **ADP151:** Base Part Number. * **ACBZ:** Package Code (WLCSP). * **1.8:** Fixed Output Voltage. * **R7:** 7-inch Tape and Reel (containing 3,000 units).