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L4975A from STM,ST Microelectronics

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L4975A

Manufacturer: STM, ST,ST

5A SWITCHING REGULATOR

Partnumber Manufacturer Quantity Availability
L4975A STM, ST,ST 20000 In Stock

Description and Introduction

5A SWITCHING REGULATOR The L4975A is a monolithic step-down switching regulator manufactured by STMicroelectronics (STM).  

### **Specifications:**  
- **Input Voltage Range:** 15V to 50V  
- **Output Voltage:** Adjustable from 5.1V to 40V  
- **Output Current:** Up to 5A  
- **Switching Frequency:** 200 kHz (fixed)  
- **Efficiency:** Up to 90%  
- **Operating Temperature Range:** -40°C to +150°C  
- **Package:** Multiwatt15 (through-hole)  

### **Descriptions:**  
- The L4975A is a high-efficiency step-down (buck) regulator with a wide input voltage range.  
- It integrates a power MOSFET, PWM controller, and protection features.  
- Designed for applications requiring high current and voltage regulation.  

### **Features:**  
- **Internal Power MOSFET:** Reduces external component count.  
- **PWM Control:** Fixed-frequency operation for stable performance.  
- **Protection Circuits:** Includes thermal shutdown, current limiting, and undervoltage lockout (UVLO).  
- **Soft-Start:** Prevents inrush current at startup.  
- **Adjustable Output Voltage:** Set via an external resistor divider.  
- **Synchronization Capability:** Can sync with an external clock signal.  

This information is based on STMicroelectronics' official documentation for the L4975A.

Application Scenarios & Design Considerations

5A SWITCHING REGULATOR

Alternative Part Number

  • LM2576T-5.0 --: Widely available step-down switching regulator in a TO-220 package with similar current capability; a common drop-in style replacement for L4975A buck converter designs.
  • MC34063A --: Versatile DC-DC switching regulator controller usable in buck configurations; very common and cost-effective alternative when exact L4975A features are not critical.
  • L5973D --: ST step-down switching regulator with comparable input voltage range and output current, offering a same-vendor alternative with similar application profile.
  • LM2678T-5.0 --: Widely available step-down switching regulator with similar current capability and simple external component count, suitable as a functional substitute in many buck converter designs.

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