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L4973V3.3 from STM,ST Microelectronics

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L4973V3.3

Manufacturer: STM

3.5A STEP DOWN SWITCHING REGULATOR

Partnumber Manufacturer Quantity Availability
L4973V3.3,L4973V33 STM 10000 In Stock

Description and Introduction

3.5A STEP DOWN SWITCHING REGULATOR The L4973V3.3 is a step-down switching regulator manufactured by STMicroelectronics (STM). Below are its key specifications, descriptions, and features:  

### **Specifications:**  
- **Output Voltage:** Fixed 3.3V  
- **Output Current:** Up to 3.5A  
- **Input Voltage Range:** 8V to 55V  
- **Switching Frequency:** 200kHz (fixed)  
- **Efficiency:** Up to 90%  
- **Operating Temperature Range:** -40°C to +150°C  
- **Package:** Multiwatt15 (through-hole)  

### **Descriptions:**  
- Monolithic DC-DC buck converter with a fixed output voltage of 3.3V.  
- Designed for high-efficiency step-down applications.  
- Includes internal current limiting, thermal shutdown, and soft-start functionality.  

### **Features:**  
- **Internal Power MOSFET:** Reduces external component count.  
- **PWM Control:** Voltage-mode control with fixed frequency.  
- **Protections:**  
  - Overcurrent protection  
  - Thermal shutdown  
  - Undervoltage lockout (UVLO)  
- **Soft-Start:** Prevents inrush current at startup.  
- **Adjustable Current Limit:** Allows customization for different applications.  

This information is sourced from STMicroelectronics' official documentation.

Application Scenarios & Design Considerations

3.5A STEP DOWN SWITCHING REGULATOR

Alternative Part Number

  • LM2576-3.3 --: Widely available 3.3V step-down switching regulator with similar current capability and pin-compatible buck topology, easy drop-in for many L4973 designs.
  • MC34063A --: Versatile adjustable switching regulator that can be configured for 3.3V output; very common and low-cost alternative when exact current rating is not critical.
  • L5973D --: Same manufacturer family of step-down switching regulators with comparable input voltage range and 3.3V output option, offering design familiarity and similar application support.

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