The **LR9280BL-15-AF5-R** is a specific low-dropout (LDO) linear regulator manufactured by **UTC (Unisonic Technologies Co., Ltd)**. It is designed for applications requiring high precision and low noise power management. --- ## 1. Component Identification The part number can be broken down to understand its specific characteristics: | Code Segment | Description | | :--- | :--- | | **LR9280** | Series Name (High Accuracy LDO) | | **BL** | Version/Accuracy Grade | | **-15** | Output Voltage (1.5V Fixed) | | **-AF5** | Package Type (SOT-25) | | **-R** | Packing Type (Tape and Reel) | --- ## 2. Key Technical Specifications The LR9280 series is known for its high input voltage tolerance compared to standard CMOS LDOs. | Feature | Specification | | :--- | :--- | | **Output Voltage** | 1.5V (Fixed) | | **Input Voltage Range** | Up to 18V | | **Max Output Current** | 300mA - 500mA (Typical) | | **Dropout Voltage** | Low (approx. 200-500mV depending on load) | | **Quiescent Current** | ~70µA | | **Accuracy** | ±2.0% | --- ## 3. Pin Configuration (SOT-25) In the AF5 (SOT-25/SOT-23-5) package, the pinout typically follows this structure: 1. **VIN**: Input Voltage Supply. 2. **GND**: Ground. 3. **CE / EN**: Chip Enable (Active High). 4. **NC / ADJ**: No connection (for fixed versions) or Feedback (for adjustable). 5. **VOUT**: Regulated Output Voltage. --- ## 4. Typical Application Circuit To ensure stability, LDOs require external capacitors. Below is the standard implementation: ```text Input Voltage (up to 18V) | [Cin: 1uF] | +------|------+ | 1 VIN | | | Output Voltage (1.5V) | 5 VOUT ----|-----------+ | | | | 2 GND | [Cout: 2.2uF] | 3 CE/EN ---|---(Logic High) +-------------+ ``` --- ## 5. Main Features & Use Cases * **High Input Voltage:** Unlike many 5V or 6V LDOs, this part handles up to 18V, making it suitable for industrial rails or battery-powered devices with higher voltage stacks. * **Over Current Protection:** Includes internal thermal shutdown and current limiting to prevent damage during a short circuit. * **Low Noise:** Suitable for sensitive analog circuits, RF modules, and sensor interfaces.