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LM2678T-5.0 from NS,National Semiconductor

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LM2678T-5.0

Manufacturer: NS

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2678T-5.0,LM2678T50 NS 16696 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator The LM2678T-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 5A  
- **Switching Frequency:** 260 kHz (typical)  
- **Efficiency:** Up to 92%  
- **Operating Junction Temperature:** -40°C to +125°C  
- **Package:** TO-220 (5-pin)  
- **Regulation Type:** Switching Buck Regulator  
- **Protection Features:** Thermal shutdown, current limit  

### **Descriptions and Features:**  
- **Simple and Efficient:** Provides a fixed 5V output with high efficiency, reducing heat dissipation.  
- **Wide Input Range:** Operates from 8V to 40V, making it suitable for various applications.  
- **Internal Soft-Start:** Minimizes inrush current during startup.  
- **Low Dropout Operation:** Maintains regulation even when the input voltage is close to the output.  
- **Minimal External Components:** Requires only an inductor, diode, and capacitors for operation.  
- **Thermal Protection:** Includes built-in thermal shutdown for safety.  
- **Current Limiting:** Protects the device from overcurrent conditions.  

This regulator is commonly used in power supply designs for industrial, automotive, and consumer electronics applications.

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Alternative Part Number

  • TPS5450DDA --: 5A step-down converter with fixed 5.0V output, similar input range and pin-compatible buck topology; TI is the direct successor to National Semiconductor parts.
  • LT1076CT-5 --: 5V fixed-output step-down switching regulator with comparable current capability and wide input voltage range, suitable as a functional replacement.
  • MC34063AP --: Versatile adjustable buck/boost/inverting switching regulator that can be configured for 5V output; widely available and cost-effective fallback option.

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