The **ADP221ACBZ-1818-R7** is a high-performance, dual-output, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed for space-constrained applications that require high power supply rejection and low noise. ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Output Type** | Fixed | | **Output Voltage** | 1.8V (Output 1) / 1.8V (Output 2) | | **Input Voltage Range** | 2.5V to 5.5V | | **Output Current** | 200 mA per channel | | **Dropout Voltage** | ~150 mV at 200 mA | | **PSRR** | 68 dB at 1 kHz | | **Package** | 6-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temp** | -40°C to +125°C | --- ### 2. Functional Features * **Dual Output:** It provides two independent 1.8V rails, allowing for simplified power routing in complex digital systems. * **Low Quiescent Current:** It draws very little power when active (approx. 45 µA with both LDOs active), which is critical for extending battery life in mobile devices. * **High PSRR (Power Supply Rejection Ratio):** It effectively filters out noise from the input power source, making it ideal for noise-sensitive analog circuits or RF stages. * **Safety Protections:** It includes internal thermal shutdown and current-limit protection to prevent device failure during fault conditions. * **Soft Start:** It features an internal soft-start to limit inrush current during startup. --- ### 3. Pin Configuration (Typical WLCSP) Because this is a 6-ball BGA/WLCSP package, the footprint is extremely small. The typical pinout includes: 1. **VIN:** Input voltage supply. 2. **GND:** Ground reference. 3. **EN1 / EN2:** Independent enable pins for each output. 4. **VOUT1 / VOUT2:** Regulated 1.8V outputs. --- ### 4. Applications This part is commonly found in: * **Mobile Handsets:** Powering baseband processors or memory. * **Digital Cameras:** Regulating power for image sensors. * **Portable Medical Devices:** Where small form factor and reliability are paramount. * **IoT Sensors:** Providing stable 1.8V rails for microcontrollers and wireless modules.