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LM2678SD-3.3 from NS,National Semiconductor

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LM2678SD-3.3

Manufacturer: NS

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2678SD-3.3,LM2678SD33 NS 1000 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator The LM2678SD-3.3 is a step-down voltage regulator manufactured by National Semiconductor (NS). Below are its key specifications, descriptions, and features:

### **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:** SOIC-8 (SD)  

### **Descriptions:**
- The LM2678SD-3.3 is a monolithic, high-efficiency switching regulator designed for step-down (buck) applications.  
- It integrates a power switch, oscillator, control circuitry, and protection features into a single chip.  
- Suitable for power supply designs requiring high efficiency and compact size.  

### **Features:**
- **Simple Design:** Requires minimal external components.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Thermal Shutdown:** Protects the device from overheating.  
- **Current Limiting:** Prevents damage from excessive load current.  
- **Low Power Standby Mode:** Enhances efficiency at light loads.  
- **Adjustable Output (Other Variants):** The fixed 3.3V version does not require external feedback resistors.  

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

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Alternative Part Number

  • TPS54332DDAR --: 3A step-down converter in SOIC-8 PowerPAD, similar input range and fixed 3.3V-class output; TI is the direct successor to National Semiconductor parts and offers better availability.
  • LT1933ES6#PBF --: Wide-input 1.5A step-down regulator in a small package with adjustable output that can be set to 3.3V; good drop-in style alternative when lower current is acceptable.
  • MP1584EN-LF-Z --: 3A wide-input step-down converter in SOIC-8, commonly used as a cost-effective substitute for LM267x family regulators with external feedback set to 3.3V.

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