3.5A STEP DOWN SWITCHING REGULATOR The **L4973D5.1-013TR** is a voltage regulator manufactured by **STMicroelectronics (STM)**. Below are its key specifications, descriptions, and features:  

### **Specifications:**  
- **Output Voltage:** 5.1V (fixed)  
- **Output Current:** Up to 3.5A  
- **Input Voltage Range:** 15V to 50V  
- **Dropout Voltage:** Typically 0.5V at 3.5A  
- **Line Regulation:** 0.07% (typical)  
- **Load Regulation:** 0.1% (typical)  
- **Operating Temperature Range:** -40°C to +150°C  
- **Package:** TO-220 (5-lead)  

### **Descriptions & Features:**  
- **High-Efficiency Step-Down Switching Regulator**  
- **Internal Current Limiting & Thermal Shutdown**  
- **Adjustable Switching Frequency (up to 300kHz)**  
- **Soft-Start Functionality**  
- **Low Standby Current Consumption**  
- **Built-in Overvoltage Protection**  
- **Suitable for Automotive & Industrial Applications**  

This regulator is designed for high-performance power supply applications requiring stable and efficient voltage conversion.

3.5A STEP DOWN SWITCHING REGULATOR