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LM2678SX-3.3 from NSC,National Semiconductor

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LM2678SX-3.3

Manufacturer: NSC

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2678SX-3.3,LM2678SX33 NSC 95 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator The LM2678SX-3.3 is a switching voltage regulator manufactured by National Semiconductor (NSC).  

### **Specifications:**  
- **Output Voltage:** 3.3V (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  
- **Protection Features:** Thermal shutdown, current limiting  

### **Descriptions:**  
The LM2678SX-3.3 is a monolithic high-efficiency switching regulator designed for step-down (buck) applications. It integrates a high-current switch with a fixed-frequency oscillator, reducing the need for external components.  

### **Features:**  
- Simple and easy-to-use design  
- Requires minimal external components  
- Internal soft-start for controlled inrush current  
- Low standby current in shutdown mode  
- Adjustable output voltage (for adjustable versions, but this is a fixed 3.3V variant)  
- High efficiency over a wide load range  

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

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

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