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LM2679T-ADJ from NS,National Semiconductor

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LM2679T-ADJ

Manufacturer: NS, NSC

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

Partnumber Manufacturer Quantity Availability
LM2679T-ADJ,LM2679TADJ NS, NSC 245 In Stock

Description and Introduction

SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit The LM2679T-ADJ is a switching voltage regulator manufactured by National Semiconductor (NS). Below are its key specifications, descriptions, and features:

### **Specifications:**
- **Input Voltage Range:** 8V to 40V  
- **Output Voltage Range:** Adjustable from 1.23V to 37V  
- **Output Current:** Up to 5A  
- **Switching Frequency:** 260 kHz (fixed)  
- **Efficiency:** Up to 92%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** TO-220 (5-pin)  

### **Descriptions:**
- The LM2679T-ADJ is a step-down (buck) switching regulator with an adjustable output voltage.  
- It integrates a high-efficiency DC-DC converter with a fixed-frequency PWM control scheme.  
- Designed for simplicity, it requires minimal external components.  
- Suitable for applications requiring high current and wide input voltage ranges.  

### **Features:**
- **Adjustable Output Voltage:** Set via an external resistor divider.  
- **High Efficiency:** Reduces power dissipation and heat generation.  
- **Internal Soft-Start:** Limits inrush current during startup.  
- **Thermal Shutdown:** Protects the device from overheating.  
- **Current Limiting:** Prevents damage from excessive load currents.  
- **Wide Input Voltage Range:** Supports 8V to 40V input.  

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

Application Scenarios & Design Considerations

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

Alternative Part Number

  • LT1076CT --: Adjustable step-down switching regulator with similar buck topology and current capability, widely used as a drop-in style alternative in TO-220 packages.
  • MC34063A --: Versatile adjustable DC-DC switching regulator controller that can be configured for buck operation, low cost and widely available.
  • TPS5430DDA --: Adjustable 3A step-down converter with integrated switch, comparable input range and simple external component count for buck designs.
  • LM2678T-ADJ --: Same SIMPLE SWITCHER family, 5A step-down regulator with adjustable output; pin-compatible in many designs and widely available from TI (which acquired NSC).

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