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LM2676S-3.3 from NS,National Semiconductor

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LM2676S-3.3

Manufacturer: NS, NSC, NS,NS

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

Partnumber Manufacturer Quantity Availability
LM2676S-3.3,LM2676S33 NS, NSC, NS,NS 1270 In Stock

Description and Introduction

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator The LM2676S-3.3 is a switching voltage regulator manufactured by National Semiconductor (NS). Below are its specifications, descriptions, and features based on Ic-phoenix technical data files:

### **Specifications:**
- **Output Voltage:** 3.3V (fixed)  
- **Input Voltage Range:** 8V to 40V  
- **Output Current:** Up to 3A  
- **Switching Frequency:** 260 kHz (typical)  
- **Efficiency:** Up to 92%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** TO-263 (D2PAK)  
- **Regulation Type:** Step-down (Buck)  

### **Descriptions:**
The LM2676S-3.3 is a monolithic integrated circuit designed for step-down (buck) voltage regulation. It provides a fixed 3.3V output from an input voltage range of 8V to 40V, making it suitable for various power supply applications. The device integrates a high-efficiency switching regulator with a minimal number of external components, simplifying design and reducing board space.

### **Features:**
- **Simple and Efficient Design:** Requires only a few external components.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Thermal Shutdown Protection:** Prevents damage from overheating.  
- **Current Limiting and Short-Circuit Protection:** Enhances reliability.  
- **Low Power Standby Mode:** Improves efficiency in light-load conditions.  
- **Wide Input Voltage Range:** Supports 8V to 40V input.  
- **High Efficiency:** Up to 92% efficiency, reducing power dissipation.  

This information is strictly factual and derived from the manufacturer's datasheet.

Application Scenarios & Design Considerations

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

Alternative Part Number

  • TPS54331D --: 3A step-down converter with fixed 3.3V option, similar input range and pin-compatible SOIC-8 footprint; widely available and well documented.
  • MP1584EN --: 3A step-down regulator supporting 3.3V output, compact SOIC-8 package, low cost and good availability as a drop-in style replacement.
  • AP65550 --: 5A synchronous buck converter with adjustable output settable to 3.3V, SOIC-8 package, higher current margin and robust thermal performance.
  • LT1933 --: 1.5A 3.3V fixed-output buck regulator in a comparable package, good drop-in for lower-current loads with proven reliability.
  • L5973D --: 2.5A step-down converter with adjustable output settable to 3.3V, similar switching regulator function and package options.

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