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LM2678T-3.3

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2678T-3.3,LM2678T33 49 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator The LM2678T-3.3 is a step-down voltage regulator manufactured by Texas Instruments. Below are its specifications, descriptions, and features:

### **Manufacturer Specifications:**
- **Input Voltage Range:** 8V to 40V  
- **Output Voltage:** 3.3V (fixed)  
- **Output Current:** Up to 5A  
- **Switching Frequency:** 260 kHz  
- **Efficiency:** Up to 92%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package Type:** TO-220 (7-pin)  
- **Regulation Type:** Switching (Buck)  

### **Descriptions:**
- The LM2678T-3.3 is a monolithic integrated circuit designed for step-down (buck) voltage regulation.  
- It provides a fixed 3.3V output with high efficiency, making it suitable for power supply applications.  
- The regulator includes internal frequency compensation, a fixed-frequency oscillator, and thermal shutdown protection.  

### **Features:**
- **High Efficiency:** Up to 92% efficiency reduces heat dissipation.  
- **Wide Input Voltage Range:** Operates from 8V to 40V.  
- **Fixed Output Voltage:** Pre-set to 3.3V.  
- **5A Output Current Capability:** Supports high-current applications.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Thermal Shutdown Protection:** Prevents damage from overheating.  
- **Short-Circuit Protection:** Includes cycle-by-cycle current limiting.  
- **Low Power Standby Mode:** Enhances efficiency in light-load conditions.  

This information is based on the manufacturer's datasheet for the LM2678T-3.3.

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
Partnumber Manufacturer Quantity Availability
LM2678T-3.3,LM2678T33 NS 160 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator The LM2678T-3.3 is a step-down voltage regulator manufactured by National Semiconductor (NS). Here are its 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:** TO-220 (5-pin)  

### **Descriptions:**
- The LM2678T-3.3 is a monolithic integrated circuit designed for step-down (buck) voltage regulation.  
- It provides a fixed 3.3V output with high efficiency and minimal external components.  
- Suitable for applications requiring high current and wide input voltage ranges.  

### **Features:**
- **Simple Design:** Requires few external components.  
- **High Efficiency:** Up to 92%, reducing heat dissipation.  
- **Internal Soft-Start:** Limits inrush current during startup.  
- **Thermal Shutdown & Current Limit Protection:** Enhances reliability.  
- **Adjustable Output (Other Variants):** The LM2678 series includes adjustable versions (LM2678T-ADJ).  

This regulator is commonly used in power supplies, industrial systems, automotive applications, and battery-powered devices.  

*(Note: National Semiconductor (NS) was acquired by Texas Instruments in 2011, but the part may still be available under the original branding.)*

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator

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