## ADP151ACBZ-2.75-R7: Technical Overview The **ADP151ACBZ-2.75-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 requiring stable power with minimal interference. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 2.75 V (Fixed) | | **Input Voltage Range** | 2.2 V to 5.5 V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 140 mV @ 200 mA | | **PSRR (Power Supply Rejection Ratio)** | 70 dB at 10 kHz | | **Low Noise** | 9 µV rms (independent of output voltage) | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | --- ### 2. Electronic Characteristics #### A. Low Quiescent Current The device is engineered for battery-powered efficiency. It consumes very low ground current (approx. 10 µA at no load), which significantly extends battery life in portable electronics. #### B. Precision Regulation The "2.75" in the part number indicates a factory-trimmed fixed output voltage of **2.75V**. This eliminates the need for external resistor dividers, reducing the total footprint and improving accuracy. #### C. Stability The regulator is stable with tiny **1 µF ceramic input and output capacitors**. This makes it ideal for high-density circuit boards where space is at a premium. --- ### 3. Pin Configuration (WLCSP) The device uses a 4-ball grid arrangement: | Ball | Signal | Description | | :--- | :--- | :--- | | **A1** | VIN | Regulator Input Supply | | **A2** | VOUT | Regulated Output Voltage | | **B1** | EN | Enable Input (High = On, Low = Off) | | **B2** | GND | Ground | --- ### 4. Typical Application Circuit ```mermaid graph LR Vin(Input 2.2V-5.5V) -->|1uF Cap| ADP[ADP151] ADP -->|1uF Cap| Vout(Output 2.75V) EN(Enable Pin) --> ADP GND(Ground) --- ADP ``` --- ### 5. Common Applications * **Mobile Phones:** Powering sensitive RF transceivers and camera modules. * **Digital Cameras:** Noise-sensitive image sensors. * **Portable Medical Devices:** Stable power for low-power microcontrollers. * **Wireless Sensor Nodes:** Ultra-low standby power consumption.