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LT1959CS8 from LT

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LT1959CS8

Manufacturer: LT

4.5A/ 500kHz Step-Down Switching Regulator

Partnumber Manufacturer Quantity Availability
LT1959CS8 LT 19 In Stock

Description and Introduction

4.5A/ 500kHz Step-Down Switching Regulator The LT1959CS8 is a switching regulator manufactured by Linear Technology (now part of Analog Devices).  

### **Specifications:**  
- **Input Voltage Range:** 3.5V to 25V  
- **Output Voltage Range:** Adjustable from 1.23V to 20V  
- **Output Current:** Up to 1.5A  
- **Switching Frequency:** 200kHz  
- **Efficiency:** Up to 90%  
- **Operating Temperature Range:** 0°C to 70°C  
- **Package:** 8-Lead SOIC  

### **Descriptions and Features:**  
- **Step-Down (Buck) Regulator:** Converts higher input voltage to a lower regulated output voltage.  
- **Low Dropout Operation:** Allows the output to remain stable even when the input voltage is close to the output.  
- **Current Mode Control:** Provides fast transient response and stable operation.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Short-Circuit Protection:** Safeguards the regulator under fault conditions.  
- **Low Quiescent Current:** Enhances efficiency in light-load conditions.  
- **Adjustable Output:** Uses external resistors to set the desired output voltage.  

The LT1959CS8 is commonly used in power supply applications requiring high efficiency and compact design.

Application Scenarios & Design Considerations

4.5A/ 500kHz Step-Down Switching Regulator

Alternative Part Number

  • LM2675M-5.0 --: Pin-compatible step-down regulator in SO-8 with similar current rating, widely available and lower cost.
  • TPS5430DDA --: Higher-current buck converter with similar input range; requires layout adjustment but is a robust drop-in for many LT1959 designs.
  • MC34063A --: Classic flexible switching regulator usable as a functional substitute for low-power buck applications, though efficiency and frequency differ.

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