The **ADP166ACBZ-1.2-R7** is a high-performance, ultra-low quiescent current, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed for battery-operated portable devices where power conservation is critical. --- ### ## Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Output Voltage** | 1.2 V (Fixed) | | **Input Voltage Range** | 2.2 V to 5.5 V | | **Maximum Output Current** | 150 mA | | **Quiescent Current ($I_q$)** | 615 nA (No load) | | **Dropout Voltage** | 120 mV @ 150 mA load | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +125°C | --- ### ## Key Features 1. **Ultra-Low Quiescent Current:** With a typical $I_q$ of only **615 nA**, this part significantly extends battery life in "always-on" systems or standby modes. 2. **Low Dropout:** The 120 mV dropout allows the regulator to maintain a stable 1.2V output even when the input battery voltage drops very close to the output level. 3. **High PSRR:** It offers good Power Supply Rejection Ratio (72 dB at 100 Hz), ensuring a clean output voltage even if the input supply is noisy. 4. **Stability:** It is designed to be stable with small, space-saving 1 μF ceramic input and output capacitors. 5. **Protection:** Includes internal thermal overload protection and short-circuit protection. --- ### ## Pin Configuration (WLCSP) The device uses a miniature 4-ball grid layout to minimize PCB footprint: | Ball | Symbol | Description | | :--- | :--- | :--- | | A1 | **VIN** | Regulator Input Supply | | A2 | **VOUT** | Regulated Output Voltage (1.2V) | | B1 | **EN** | Enable Input (High = On, Low = Off) | | B2 | **GND** | Ground | --- ### ## Typical Application Circuit The ADP166 requires minimal external components, making it ideal for space-constrained designs. ```markdown VIN ----[ C1: 1uF ]----( VIN ) ( VOUT )----[ C2: 1uF ]---- VOUT (1.2V) | | ( EN ) ( GND ) | | Enable Sig Ground ``` --- ### ## Common Applications * **IoT Sensors:** Devices that spend most of their time in sleep mode. * **Wearables:** Smartwatches and fitness trackers. * **Portable Medical Devices:** Glucose meters and heart rate monitors. * **Mobile Phones:** Powering low-voltage sub-rails (logic cores).