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LM2679T-5.0 from NS,National Semiconductor

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LM2679T-5.0

Manufacturer: NS, 国半

SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit

Partnumber Manufacturer Quantity Availability
LM2679T-5.0,LM2679T50 NS, 国半 86 In Stock

Description and Introduction

SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit The LM2679T-5.0 is a switching voltage regulator manufactured by National Semiconductor (国半). Below are its specifications, descriptions, and features based on factual information:  

### **Specifications:**  
- **Output Voltage:** Fixed 5.0V  
- **Input Voltage Range:** 8V to 40V  
- **Output Current:** Up to 5A  
- **Switching Frequency:** 260 kHz (typical)  
- **Efficiency:** Up to 92%  
- **Operating Junction Temperature:** -40°C to +125°C  
- **Package Type:** TO-220 (5-pin)  
- **Regulation Type:** Step-down (Buck) converter  

### **Descriptions:**  
The LM2679T-5.0 is a monolithic integrated circuit designed for step-down (buck) voltage regulation. It provides a fixed 5.0V output with high efficiency and requires minimal external components. The device includes an internal N-channel MOSFET switch, a fixed-frequency oscillator, thermal shutdown, and current limiting for protection.  

### **Features:**  
- **Simple and Easy-to-Use:** Requires only 6 external components.  
- **High Efficiency:** Up to 92% efficiency with minimal power loss.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Thermal Shutdown Protection:** Prevents damage from overheating.  
- **Current Limit Protection:** Safeguards against excessive load currents.  
- **Wide Input Voltage Range:** Suitable for various power supply applications.  
- **Fixed Frequency Operation:** 260 kHz switching frequency reduces noise and simplifies filtering.  

This information is based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit

Alternative Part Number

  • TPS5450DDA --: 5A step-down converter with fixed 5V output in a similar power range; widely available and pin-compatible in function.
  • LT1076CT-5 --: 5V fixed-output step-down switching regulator with comparable current capability and TO-220 package.
  • MC34063AP --: Versatile adjustable buck converter usable for 5V output; lower current but a common low-cost fallback for similar designs.
  • LT1076CT --: Robust 2A step-down switching regulator with adjustable output, can be set to 5.0V and is a proven alternative in similar power supply designs.
  • MC34063AP1 --: Versatile general-purpose DC-DC converter IC that can be configured for 5.0V step-down operation, low cost and broadly stocked as a fallback option.

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