1.0A Constant Current Buck Regulator for High Power LED Drivers 8-SOIC -40 to 125 The LM3404MAX/NOPB is a switching regulator from National Semiconductor (NSC).  

### **Specifications:**  
- **Input Voltage Range:** 6V to 42V  
- **Output Current:** Up to 1A  
- **Switching Frequency:** Adjustable up to 1MHz  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** 8-Pin SOIC  

### **Descriptions:**  
The LM3404 is a monolithic, step-down (buck) switching regulator designed for driving high-power LEDs. It integrates a high-side N-channel MOSFET and supports constant current or constant voltage regulation.  

### **Features:**  
- **Wide Input Voltage Range:** 6V to 42V  
- **Adjustable Output Current** (via external resistor)  
- **PWM Dimming Control**  
- **Thermal Shutdown Protection**  
- **Cycle-by-Cycle Current Limiting**  
- **Undervoltage Lockout (UVLO)**  

This device is commonly used in LED lighting applications, automotive lighting, and industrial systems.

1.0A Constant Current Buck Regulator for High Power LED Drivers 8-SOIC -40 to 125