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LM3503SQ-44 from NS,National Semiconductor

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LM3503SQ-44

Manufacturer: NS

Dual-Display Constant Current LED Driver with Analog Brightness Control

Partnumber Manufacturer Quantity Availability
LM3503SQ-44,LM3503SQ44 NS 28700 In Stock

Description and Introduction

Dual-Display Constant Current LED Driver with Analog Brightness Control The LM3503SQ-44 is a step-down DC-DC converter manufactured by National Semiconductor (NS).  

### **Specifications:**  
- **Input Voltage Range:** 4V to 35V  
- **Output Voltage Range:** Adjustable from 1.225V to 32V  
- **Output Current:** Up to 3A  
- **Switching Frequency:** 500 kHz (fixed)  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** 44-pin LLP (Leadless Leadframe Package)  

### **Descriptions:**  
The LM3503SQ-44 is a high-efficiency, synchronous step-down DC-DC converter designed for power supply applications. It integrates high-side and low-side MOSFETs, reducing external component count. The device supports adjustable output voltage and provides protection features such as thermal shutdown and current limiting.  

### **Features:**  
- Integrated high-side and low-side MOSFETs  
- Adjustable output voltage via external resistors  
- Internal soft-start for controlled startup  
- Overcurrent and thermal protection  
- Low shutdown current (<1µA)  
- Synchronization capability with external clock  
- Lead-free and RoHS compliant  

This information is based solely on the provided knowledge base.

Application Scenarios & Design Considerations

Dual-Display Constant Current LED Driver with Analog Brightness Control
Partnumber Manufacturer Quantity Availability
LM3503SQ-44,LM3503SQ44 NSC 15 In Stock

Description and Introduction

Dual-Display Constant Current LED Driver with Analog Brightness Control The LM3503SQ-44 is a switching regulator manufactured by National Semiconductor (NSC). Below are its specifications, descriptions, and features based on factual information:

### **Specifications:**
- **Manufacturer:** National Semiconductor (NSC)  
- **Part Number:** LM3503SQ-44  
- **Package:** 44-Pin WQFN (Quad Flat No-Lead)  
- **Type:** Step-Down (Buck) Switching Regulator  
- **Input Voltage Range:** 4.5V to 36V  
- **Output Voltage Range:** Adjustable (0.8V to 33V)  
- **Output Current:** Up to 3A  
- **Switching Frequency:** Adjustable (300kHz to 1MHz)  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Control Method:** Current Mode PWM  

### **Descriptions:**
The LM3503SQ-44 is a high-efficiency, step-down DC-DC converter designed for applications requiring high output current with a wide input voltage range. It integrates a high-side N-channel MOSFET and supports adjustable switching frequency for optimized performance.  

### **Features:**
- **Wide Input Voltage Range (4.5V to 36V)**  
- **3A Continuous Output Current**  
- **Adjustable Output Voltage (0.8V to 33V)**  
- **Programmable Switching Frequency (300kHz to 1MHz)**  
- **Integrated N-Channel MOSFET**  
- **Current Mode Control for Fast Transient Response**  
- **Thermal Shutdown and Overcurrent Protection**  
- **Synchronizable to External Clock**  
- **Low Quiescent Current in Standby Mode**  

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

Application Scenarios & Design Considerations

Dual-Display Constant Current LED Driver with Analog Brightness Control

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