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LM2679S-12 from NS,National Semiconductor

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LM2679S-12

Manufacturer: NS, 国半

SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
Partnumber Manufacturer Quantity Availability
LM2679S-12,LM2679S12 NS, 国半 1019 In Stock

Description and Introduction

SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit The LM2679S-12 is a switching voltage regulator manufactured by National Semiconductor (国半). 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 Temperature Range:** -40°C to +125°C  
- **Package:** TO-263 (D2PAK)  

### **Descriptions:**
The LM2679S-12 is a step-down (buck) switching regulator designed for high-efficiency power conversion. It integrates a high-performance voltage regulator with a power MOSFET switch, reducing external component count. The fixed 12V output version simplifies design while providing stable power for various applications.

### **Features:**
- **Simple Design:** Requires minimal external components.  
- **High Efficiency:** Up to 92% efficiency with internal MOSFET.  
- **Wide Input Range:** Operates from 8V to 40V.  
- **Fixed Output Voltage:** Pre-set to 12V (±4% tolerance).  
- **Thermal Shutdown & Current Limiting:** Protects against overloads and overheating.  
- **Soft-Start Function:** Reduces inrush current during startup.  

This information is based on the manufacturer's datasheet for the LM2679S-12.

Application Scenarios & Design Considerations

SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit

Alternative Part Number

  • TPS5450DDA --: 5A step-down converter in SOIC-8 PowerPAD, similar input range and fixed 12V-class output capability, widely available and pin-compatible in function.
  • LT1936EMS8E --: High-efficiency step-down regulator with comparable current rating and wide input voltage, suitable drop-in functional replacement for 12V output designs.
  • MC34063ADR2G --: Versatile DC-DC switching regulator usable in step-down configuration, low cost and broadly stocked, acceptable for less demanding 12V output applications.
  • TPS54560DDA --: Wide-input 5A step-down converter in SOIC-8 PowerPAD, similar to the LM2679 family and from the same vendor lineage (National Semiconductor is now part of TI), making it a strong drop-in candidate for 12V output designs.
  • LT3973IMSE-12 --: Fixed 12V output buck regulator with integrated switch and wide input range, offering comparable current capability and a different series/prefix for clear distinction.
  • MP2359DJ-LF-Z --: Compact step-down converter with adjustable/fixed output options and good availability, suitable as a lower-cost alternative when 12V rail current requirements are moderate.

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