The **ADP166ACPZN-3.3-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 | Specification | | :--- | :--- | | **Output Voltage** | 3.3 V (Fixed) | | **Input Voltage Range** | 2.2 V to 5.5 V | | **Maximum Output Current** | 150 mA | | **Quiescent Current ($I_q$)** | 615 nA (Typical, No Load) | | **Dropout Voltage** | 120 mV @ 150 mA load | | **Package Type** | 6-Lead LFCSP (2mm x 2mm) | | **Operating Temperature** | -40°C to +125°C | --- ### ## Key Features 1. **Ultra-Low Quiescent Current:** The 615 nA idle current significantly extends battery life in "always-on" systems or devices that spend most of their time in sleep mode. 2. **Stability with Small Capacitors:** It is designed for stable operation with tiny 1 µF ceramic input and output capacitors, saving PCB real estate. 3. **Low Dropout Voltage:** With only 120 mV required between input and output at full load, it can maintain regulation even as battery voltage nears its end of life. 4. **Logic Controlled Enable:** Features an EN pin to power down the device, reducing current consumption to less than 50 nA. --- ### ## Pin Configuration (6-Lead LFCSP) | Pin No. | Name | Description | | :--- | :--- | :--- | | 1 | VIN | Regulator Input Supply. | | 2 | GND | Ground Reference. | | 3 | EN | Enable Input. High = On, Low = Off. | | 4 | VOUT | Regulated Output Voltage (3.3V). | | 5 | NC | No Connect (leave floating). | | 6 | ADJ/NC | Not connected for fixed versions. | --- ### ## Applications * **IoT Sensors:** Ideal for remote sensors running on coin cell batteries. * **Wearables:** Smartwatches and fitness trackers requiring small footprints. * **Portable Medical Devices:** Blood glucose monitors and heart rate sensors. * **Energy Harvesting:** Systems operating on extremely limited power sources. --- ### ## Part Number Breakdown * **ADP166:** Product Series. * **ACPZ:** LFCSP Package (Lead-Free). * **N:** Temperature Range (Industrial). * **3.3:** Fixed Output Voltage of 3.3V. * **R7:** 7-inch Reel (Tape and Reel packaging).