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LM3403 from ST.TI,ST Microelectronics

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LM3403

Manufacturer: ST.TI, NSC

Quad Operational Amplifiers

Partnumber Manufacturer Quantity Availability
LM3403 ST.TI, NSC 1127 In Stock

Description and Introduction

Quad Operational Amplifiers The LM3403 is a switching regulator manufactured by National Semiconductor (NSC). It is a step-down (buck) DC-DC converter designed to provide a fixed or adjustable output voltage.  

### **Specifications:**  
- **Input Voltage Range:** 4.5V to 36V  
- **Output Voltage Range:** Adjustable from 1.225V to 35V  
- **Output Current:** Up to 1.5A  
- **Switching Frequency:** 100 kHz to 1.5 MHz (adjustable with external components)  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package Options:** SOIC-8, MSOP-8, and LLP-8  

### **Descriptions and Features:**  
- **Buck Regulator:** Converts higher input voltage to a lower regulated output voltage.  
- **Adjustable Output:** Uses an external resistor divider to set the output voltage.  
- **Internal Compensation:** Simplifies design by reducing external components.  
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.  
- **Thermal Shutdown:** Prevents damage from excessive heat.  
- **Soft-Start Function:** Reduces inrush current during startup.  
- **Synchronous Rectification (LM3403A variant):** Improves efficiency by reducing power loss.  

The LM3403 is commonly used in industrial, automotive, and consumer electronics applications requiring efficient power conversion.

Application Scenarios & Design Considerations

Quad Operational Amplifiers

Alternative Part Number

  • TL074 --: Quad low-noise JFET-input op-amp with similar general-purpose performance and widely available as a direct functional substitute.
  • LM324 --: Industry-standard quad op-amp with comparable supply range and pinout, commonly used where LM3403 is specified.
  • MC33074 --: Quad op-amp with similar electrical characteristics and pin-compatible footprint, suitable as an alternative source.
  • MC3403P --: Pin-compatible quad operational amplifier in the same 3403 family, widely available and electrically equivalent.
  • UA3403PC --: Direct functional equivalent quad op-amp with matching pinout and supply range.
  • TL074CN --: Quad low-noise JFET-input op-amp that can substitute in most applications with similar supply voltage and pinout.

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