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L4973D3.3 from STM,ST Microelectronics

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L4973D3.3

Manufacturer: STM, ST,ST

3.5A STEP DOWN SWITCHING REGULATOR

Partnumber Manufacturer Quantity Availability
L4973D3.3,L4973D33 STM, ST,ST 20614 In Stock

Description and Introduction

3.5A STEP DOWN SWITCHING REGULATOR The L4973D3.3 is a step-down switching regulator manufactured by STMicroelectronics (ST). Below are the factual details from Ic-phoenix technical data files:

### **Manufacturer:**  
- **STMicroelectronics (ST)**  

### **Specifications:**  
- **Output Voltage:** 3.3V (fixed)  
- **Output Current:** Up to 3.5A  
- **Input Voltage Range:** 8V to 55V  
- **Switching Frequency:** 200kHz (adjustable up to 500kHz with external components)  
- **Efficiency:** Up to 90%  
- **Operating Temperature Range:** -40°C to +150°C  
- **Package:** SO-20 (PowerSO-20)  
- **Protection Features:**  
  - Overcurrent protection  
  - Thermal shutdown  
  - Undervoltage lockout  

### **Descriptions and Features:**  
- **Step-Down (Buck) Converter:** Converts higher input voltage to a regulated 3.3V output.  
- **High Efficiency:** Optimized for minimal power loss.  
- **Adjustable Frequency:** Allows optimization for efficiency or component size.  
- **Internal Power MOSFET:** Simplifies design by integrating the switching element.  
- **Soft-Start Function:** Reduces inrush current during startup.  
- **Error Amplifier:** Provides precise voltage regulation.  

This information is based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

3.5A STEP DOWN SWITCHING REGULATOR

Alternative Part Number

  • LM2596S-3.3 --: Widely available 3.3V step-down switching regulator with similar current capability and pin-compatible buck topology, easy second source.
  • MC34063A --: Versatile adjustable buck/boost/inverting switching regulator that can be configured for 3.3V output, low cost and broadly stocked.
  • AP1501-33 --: 3.3V fixed-output buck converter with integrated switch, comparable input range and load current, suitable drop-in alternative for many designs.

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