The **LR1102BL-30-AF5-R** is a low-dropout (LDO) linear voltage regulator. It is designed to provide a stable 3.0V output from a higher input voltage with very low power consumption, making it ideal for battery-powered applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 3.0V (Fixed) | | **Input Voltage Range** | Up to 6V - 7V (Typical Max) | | **Output Current** | 150mA to 300mA (Series dependent) | | **Dropout Voltage** | Low (typically < 300mV at full load) | | **Quiescent Current** | Very Low (Micro-ampere range) | | **Package Type** | SOT-25 / SOT-23-5 | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Part Number Breakdown The nomenclature follows the standard naming convention for UTC (Unisonic Technologies Co): * **LR1102**: Base series number (Low Dropout Regulator). * **B**: Accuracy/Feature grade. * **L**: Lead-free/Halogen-free. * **30**: 3.0V Output voltage. * **AF5**: Package code (SOT-25 / SOT-23-5). * **R**: Tape and Reel packaging. --- ### 3. Pin Configuration (Typical SOT-25) Standard LDOs in this package usually follow this pinout: 1. **VIN**: Input Voltage Supply. 2. **GND**: Ground Reference. 3. **CE / EN**: Chip Enable (High = On, Low = Off). 4. **NC / ADJ**: No connection (for fixed versions). 5. **VOUT**: Regulated 3.0V Output. --- ### 4. Typical Application Circuit To ensure stability, LDOs require external capacitors. ```c Input (Vin) ----[ CIN 1uF ]----| VIN (1) VOUT (5) |----[ COUT 1uF ]---- Output (3.0V) | LR1102 | Enable (Hi) -------------------| CE (3) GND (2) |-------------------- Ground ``` ### 5. Features and Advantages * **Low Noise:** Suitable for RF and sensitive analog circuits. * **Small Footprint:** The SOT-25 package saves PCB space. * **Shutdown Mode:** Using the Enable (CE) pin, the device can be turned off to conserve battery life (typically < 1µA in shutdown). * **Protection:** Includes internal thermal shutdown and current limiting.