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LM2678SD-ADJ from NS,National Semiconductor

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LM2678SD-ADJ

Manufacturer: NS

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2678SD-ADJ,LM2678SDADJ NS 2083 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator The LM2678SD-ADJ is a switching voltage regulator manufactured by National Semiconductor (NS).  

### **Specifications:**  
- **Input Voltage Range:** 8V to 40V  
- **Adjustable Output Voltage:** 1.21V to 37V  
- **Output Current:** Up to 5A  
- **Switching Frequency:** 260 kHz (typical)  
- **Efficiency:** Up to 92%  
- **Package:** 7-Lead LLP (SD)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Protection Features:** Thermal shutdown, current limiting  

### **Descriptions:**  
The LM2678SD-ADJ is a step-down (buck) switching regulator designed for high-efficiency power conversion. It integrates a high-side N-channel MOSFET switch and requires minimal external components. The adjustable output version allows flexibility in setting the desired voltage using an external resistor divider.  

### **Features:**  
- **Simple and Easy-to-Use Design**  
- **High Efficiency (Up to 92%)**  
- **Requires Only 5 External Components**  
- **Internal Soft-Start Function**  
- **Low Power Standby Mode (IQ < 50µA)**  
- **Fixed Frequency Operation (260 kHz)**  
- **Thermal Shutdown Protection**  

This regulator is suitable for applications such as industrial power supplies, automotive systems, and battery-powered equipment.

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

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