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LM2676T-12 from NS,National Semiconductor

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LM2676T-12

Manufacturer: NS, NSC

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2676T-12,LM2676T12 NS, NSC 490 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator The LM2676T-12 is a step-down switching voltage regulator manufactured by National Semiconductor (NSC). Below are its specifications, descriptions, and features based on factual information:

### **Specifications:**
- **Output Voltage:** Fixed 12V  
- **Output Current:** Up to 3A  
- **Input Voltage Range:** 8V to 40V  
- **Switching Frequency:** 260 kHz (typical)  
- **Efficiency:** Up to 92%  
- **Operating Junction Temperature:** -40°C to +125°C  
- **Package:** TO-220 (5-pin)  

### **Descriptions:**
The LM2676T-12 is a monolithic integrated circuit designed for step-down (buck) voltage regulation. It provides a fixed 12V output with high efficiency and requires minimal external components. It is suitable for applications requiring a stable and efficient DC-DC conversion.

### **Features:**
- **Simple Design:** Requires only 5 external components.  
- **High Efficiency:** Up to 92% efficiency, reducing heat dissipation.  
- **Internal Soft-Start:** Limits inrush current during startup.  
- **Thermal Shutdown & Current Limit Protection:** Prevents damage from overheating and overcurrent.  
- **Wide Input Voltage Range:** Supports 8V to 40V input.  
- **Fixed Output Voltage:** No external feedback resistors needed.  

This information is sourced from the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

Alternative Part Number

  • TPS54232D --: Pin-compatible step-down converter with similar 12V fixed output capability and wide input range; TI is the direct successor to National Semiconductor.
  • LT1936EMS8E --: High-efficiency buck regulator with comparable current rating and input voltage range, suitable drop-in replacement with minor layout adjustment.
  • MC34063ADR2G --: Widely available general-purpose switching regulator that can be configured for 12V output; lower cost but requires external components and lower efficiency.
  • LT1076CT-12 --: Same TO-220 package 12V fixed step-down regulator with comparable current rating; widely used as a direct substitute in buck converter designs.
  • MC34166T-12 --: 12V fixed-output buck regulator in TO-220 with similar input range and switching topology, suitable drop-in replacement for many LM2676 applications.
  • TPS54312 --: Modern 12V fixed-output step-down converter with higher efficiency and similar electrical function; may require minor layout adjustment but is a strong functional alternative.

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