The **LR9280CL-18-AE2-R** is a Low Dropout (LDO) Linear Regulator commonly used in power management applications where stable, low-noise voltage regulation is required. --- ### 1. General Specification Table | Parameter | Specification | | :--- | :--- | | **Part Number** | LR9280CL-18-AE2-R | | **Fixed Output Voltage** | 1.8V | | **Input Voltage Range** | Up to 6.0V | | **Output Current** | ~300mA to 500mA (typical for this series) | | **Package Type** | SOT-23 / SOT-23-3 (identified by AE2 code) | | **Dropout Voltage** | Low (typically < 300mV at full load) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Part Number Breakdown The nomenclature for this specific part generally follows this logic: * **LR9280**: The base series number for the CMOS LDO regulator. * **CL**: Specific internal grading or feature set (e.g., accuracy/current limit). * **18**: Indicates a fixed output voltage of **1.8V**. * **AE2**: Refers to the physical package style, typically a **SOT-23-3**. * **R**: Indicates the shipping format, which is **Tape and Reel**. --- ### 3. Key Features and Functions * **Low Quiescent Current:** Designed to consume very little power during operation, extending battery life in portable electronics. * **High PSRR:** High Power Supply Rejection Ratio, which helps filter out noise from the input power source. * **Stability:** Usually stable with low-ESR ceramic capacitors. * **Protections:** Includes built-in thermal shutdown and current limiting to prevent device failure under fault conditions. --- ### 4. Typical Application Circuit In a standard configuration, the LR9280 requires minimal external components: ```text Input (Vin) ----[Cin]----[ LR9280 ]----[Cout]---- Output (1.8V) | Ground ``` * **Cin:** 1µF Ceramic Capacitor (minimizes input noise). * **Cout:** 1µF to 2.2µF Ceramic Capacitor (ensures stability). --- ### 5. Common Use Cases 1. **Mobile Handsets:** Providing 1.8V rails for digital logic or memory. 2. **Portable Media Players:** Noise-sensitive audio or sensor circuits. 3. **Microcontrollers:** Powering the core of low-power MCUs.