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L4973D3.3 from STM,ST Microelectronics

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L4973D3.3

Manufacturer: STM

3.5A STEP DOWN SWITCHING REGULATOR

Partnumber Manufacturer Quantity Availability
L4973D3.3,L4973D33 STM 10000 In Stock

Description and Introduction

3.5A STEP DOWN SWITCHING REGULATOR The **L4973D3.3** is a **3.3V, 3.5A step-down switching regulator** manufactured by **STMicroelectronics (STM)**.  

### **Key Specifications:**  
- **Output Voltage:** 3.3V (fixed)  
- **Output Current:** Up to 3.5A  
- **Input Voltage Range:** 8V to 55V  
- **Switching Frequency:** 200kHz (fixed)  
- **Efficiency:** Up to 90%  
- **Operating Temperature Range:** -40°C to +150°C  
- **Package:** **Multiwatt15** (through-hole)  

### **Features:**  
- **Step-down (Buck) DC-DC converter**  
- **Internal current-mode control**  
- **Soft-start function**  
- **Overcurrent protection**  
- **Thermal shutdown protection**  
- **Undervoltage lockout (UVLO)**  
- **Adjustable output voltage version available (L4973)**  

### **Applications:**  
- **Power supplies for industrial and automotive systems**  
- **Distributed power systems**  
- **Telecommunications equipment**  
- **Battery chargers**  

This regulator is designed for high-efficiency power conversion in demanding environments.

Application Scenarios & Design Considerations

3.5A STEP DOWN SWITCHING REGULATOR
Partnumber Manufacturer Quantity Availability
L4973D3.3,L4973D33 ST,ST 10000 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
Partnumber Manufacturer Quantity Availability
L4973D3.3,L4973D33 ST 614 In Stock

Description and Introduction

3.5A STEP DOWN SWITCHING REGULATOR The L4973D3.3 is a step-down switching regulator manufactured by STMicroelectronics. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:  

### **Manufacturer:** STMicroelectronics  
### **Part Number:** L4973D3.3  
### **Type:** Step-Down (Buck) Switching Regulator  
### **Output Voltage:** 3.3V (Fixed)  
### **Output Current:** Up to 3.5A  
### **Input Voltage Range:** 8V to 55V  
### **Switching Frequency:** 200kHz  
### **Efficiency:** Up to 90%  
### **Package:** DIP-20 (Multiwatt-15)  

### **Key Features:**  
- **Fixed 3.3V Output** with ±2% accuracy  
- **Overcurrent Protection** with automatic recovery  
- **Thermal Shutdown** for overtemperature protection  
- **Soft-Start Function** to limit inrush current  
- **Undervoltage Lockout (UVLO)** for input voltage monitoring  
- **Synchronous Rectification** for improved efficiency  
- **Adjustable Current Limit**  

### **Applications:**  
- Industrial power supplies  
- Automotive systems  
- Distributed power architectures  
- Battery chargers  

This regulator is designed for high-efficiency DC-DC conversion in demanding applications.

Application Scenarios & Design Considerations

3.5A STEP DOWN SWITCHING REGULATOR

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