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LM2673SD-5.0 from NS,National Semiconductor

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LM2673SD-5.0

Manufacturer: NS

SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit

Partnumber Manufacturer Quantity Availability
LM2673SD-5.0,LM2673SD50 NS 3254 In Stock

Description and Introduction

SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit The LM2673SD-5.0 is a step-down voltage regulator manufactured by National Semiconductor (NS).  

### **Specifications:**  
- **Output Voltage:** 5.0V (fixed)  
- **Input Voltage Range:** 8V to 40V  
- **Output Current:** Up to 3A  
- **Switching Frequency:** 260 kHz  
- **Efficiency:** Up to 92%  
- **Package:** SOIC-8 (D2PAK)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Protection Features:** Thermal shutdown, current limiting  

### **Descriptions:**  
The LM2673SD-5.0 is a monolithic integrated circuit that provides all active functions for a step-down (buck) switching regulator. It is designed for high efficiency and simplicity, requiring minimal external components.  

### **Features:**  
- Simple and easy-to-use design  
- High efficiency (up to 92%)  
- Requires only 5 external components  
- Internal soft-start reduces inrush current  
- Fixed-frequency oscillator (260 kHz)  
- Low standby current (50 µA typical in shutdown mode)  
- Thermal shutdown and current limit protection  

This regulator is suitable for applications requiring a stable 5V output from a higher input voltage, such as power supplies for industrial, automotive, and consumer electronics.

Application Scenarios & Design Considerations

SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit

Alternative Part Number

  • TPS5430DDA --: 3A step-down converter in SOIC-8 PowerPAD with similar input range and fixed 5V output option, widely available and pin-compatible in function.
  • LT1933ES6#PBF --: 1.5A step-down regulator in SOT-23-6, suitable for lower-current 5V rails where board space is tight and LM2673SD is unavailable.
  • MC34063ADR2G --: Versatile general-purpose DC-DC converter in SOIC-8 that can be configured for 5V step-down, low cost and broadly stocked as a fallback option.

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