The **LR9101G-30-AE2-R** is a specific low-dropout (LDO) linear regulator manufactured by **UTC (Unisonic Technologies)**. It is designed to provide a stable, fixed output voltage from a fluctuating input source with minimal power loss. --- ### 1. Key Technical Specifications The part number itself contains encoded information about its performance and physical characteristics. | Parameter | Specification | | :--- | :--- | | **Output Voltage** | Fixed **3.0V** | | **Input Voltage Range** | Up to 6.0V (Max) | | **Output Current** | Typically up to 300mA | | **Package Type** | SOT-23-3 (indicated by "AE2") | | **Accuracy** | ±2% | | **Quiescent Current** | Very Low (approx. 50µA - 70µA) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **LR9101**: Series name (Low-Dropout Linear Regulator). * **G**: Halogen-free and RoHS compliant (Green). * **30**: Represents the output voltage (3.0 Volts). * **AE2**: Package code for **SOT-23** (3-pin version). * **R**: Tape and Reel packaging. --- ### 3. Pin Configuration (SOT-23) In the AE2 package, the pins are typically assigned as follows: 1. **GND (Ground)**: The common reference point for the circuit. 2. **Vout (Output)**: The regulated 3.0V output. 3. **Vin (Input)**: The unregulated supply voltage. --- ### 4. Primary Applications The LR9101 series is favored in battery-powered devices where efficiency and space are critical: * **Mobile Communication**: Smartphones and RF modules. * **Portable Electronics**: Digital cameras and handheld gaming devices. * **Battery Management**: Providing a stable rail for microcontrollers (MCUs). * **Low-Noise Sensors**: Since LDOs provide "cleaner" power compared to switching regulators. --- ### 5. Circuit Design Tip To ensure stability and reduce noise, it is standard practice to use **ceramic capacitors** with this IC: * **Input Capacitor ($C_{in}$):** 1µF to 10µF (to handle input transients). * **Output Capacitor ($C_{out}$):** 1µF to 10µF (essential for regulator loop stability). ---