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SC4521 from SEMTECH

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SC4521

Manufacturer: SEMTECH, SC

3A Step-Down Switching Regulator with Programmable Soft Start

Partnumber Manufacturer Quantity Availability
SC4521 SEMTECH, SC 768 In Stock

Description and Introduction

3A Step-Down Switching Regulator with Programmable Soft Start Part SC4521 is manufactured by SEMTECH. Below are its specifications, descriptions, and features based on available factual information:  

### **Specifications:**  
- **Input Voltage Range:** 4.5V to 36V  
- **Output Voltage Range:** Adjustable (via external resistors)  
- **Output Current:** Up to 5A  
- **Switching Frequency:** Adjustable (300kHz to 2.2MHz)  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package Type:** QFN (5mm x 5mm)  

### **Descriptions:**  
- The SC4521 is a high-efficiency, synchronous step-down DC-DC converter.  
- It integrates high-side and low-side MOSFETs for compact power solutions.  
- Designed for applications requiring high power density and efficiency.  

### **Features:**  
- **Wide Input Voltage Range:** Supports 4.5V to 36V input.  
- **High Output Current:** Capable of delivering up to 5A.  
- **Adjustable Switching Frequency:** Configurable between 300kHz and 2.2MHz.  
- **Integrated MOSFETs:** Reduces external component count.  
- **Programmable Soft-Start:** Prevents inrush current.  
- **Protection Features:** Includes overcurrent, overvoltage, and thermal shutdown.  
- **Low Quiescent Current:** Improves efficiency at light loads.  

This information is based on SEMTECH's official documentation for the SC4521. For detailed application notes or schematics, refer to the datasheet.

Application Scenarios & Design Considerations

3A Step-Down Switching Regulator with Programmable Soft Start

Alternative Part Number

  • TPS54231 --: Pin-compatible step-down converter with similar input voltage range and current rating, widely available and well documented.
  • MP1584 --: Comparable buck regulator with similar switching frequency and output current capability, low-cost alternative.
  • LM2596 --: Industry-standard step-down regulator with similar voltage and current ratings, easy to source and substitute.
  • LM2596S-ADJ --: Widely available adjustable step-down regulator with similar current capability and pin-compatible function; easy to source and well documented.
  • MP1584EN --: Compact high-efficiency buck converter covering similar input/output range, good drop-in functional replacement for many SC4521 designs.
  • AP3211KTR-G1 --: Low-cost adjustable buck regulator with comparable voltage and current ratings, suitable alternative when layout flexibility is allowed.

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