The **ADP165ACBZ-2.2-R7** is a high-performance, ultra-low quiescent current, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed for portable and battery-powered applications where space and power efficiency are critical. --- ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Output Voltage** | 2.2V (Fixed) | | **Input Voltage Range** | 2.2V to 5.5V | | **Maximum Output Current** | 150 mA | | **Dropout Voltage** | 120 mV @ 150 mA load | | **Quiescent Current ($I_Q$)** | 0.6 µA (Typical, No Load) | | **Shutdown Current** | < 50 nA | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Functional Components The internal architecture of the ADP165 consists of several specialized electronic stages: 1. **Internal Reference Voltage:** A high-precision bandgap reference that maintains a stable 2.2V output despite fluctuations in input voltage or temperature. 2. **Error Amplifier:** Compares the output voltage to the internal reference and adjusts the pass transistor to maintain regulation. 3. **PMOS Pass Transistor:** Unlike bipolar regulators, the use of a PMOS element allows for a very low dropout voltage and extremely low ground current. 4. **Shutdown Logic (EN Pin):** An active-high enable pin. When pulled low, it disables the internal circuitry, reducing current draw to near zero. 5. **Protection Circuitry:** Includes **Thermal Overload Protection** (prevents damage from overheating) and **Short-Circuit Protection** (limits current during fault conditions). --- ### 3. Application and Usage Because of its tiny footprint (WLCSP package) and ultra-low power consumption, it is commonly used in: * **Mobile Handsets:** Powering sensitive analog sub-sections. * **IoT Sensors:** Devices that spend most of their time in sleep mode and require minimum battery drain. * **Wearables:** Smartwatches and fitness trackers where PCB space is extremely limited. * **Digital Cameras:** Stable 2.2V rails for image processing or logic interfaces. --- ### 4. Part Number Breakdown Understanding the suffix codes: * **ADP165:** Series Name (Ultra-low $I_Q$ LDO). * **ACBZ:** Package code for WLCSP. * **2.2:** Fixed output voltage of 2.2 Volts. * **R7:** Tape and Reel packaging (7-inch reel).