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LM2678SX-5.0 from NS,National Semiconductor

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LM2678SX-5.0

Manufacturer: NS

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2678SX-5.0,LM2678SX50 NS 2630 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator The LM2678SX-5.0 is a switching voltage regulator manufactured by National Semiconductor (NS). Below are its key specifications, descriptions, and features:

### **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 Temperature Range:** -40°C to +125°C  
- **Package:** TO-263 (D2PAK)  
- **Regulation Type:** Buck (Step-Down) Converter  

### **Descriptions:**
The LM2678SX-5.0 is a monolithic, high-efficiency switching regulator designed for step-down (buck) voltage conversion. It integrates a power switch, oscillator, control circuitry, and protection features in a single package. The fixed 5.0V output version simplifies design by eliminating the need for external feedback resistors.

### **Features:**
- **Simple Design:** Requires minimal external components.  
- **High Efficiency:** Up to 92% efficiency reduces power dissipation.  
- **Internal Soft-Start:** Limits inrush current during startup.  
- **Thermal Shutdown:** Protects the device from overheating.  
- **Current Limit Protection:** Prevents damage from excessive load currents.  
- **Wide Input Voltage Range:** Suitable for automotive, industrial, and battery-powered applications.  
- **Low Standby Current:** Enhances efficiency in light-load conditions.  

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

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

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