Low Noise White LED Constant Current Supply with Dual Function Brightness Control The LM2793LD is a charge pump-based LED driver manufactured by National Semiconductor (NS).  

### **Specifications:**  
- **Input Voltage Range:** 2.7V to 5.5V  
- **Output Current:** Up to 30mA per channel (adjustable)  
- **Number of Channels:** 3  
- **Switching Frequency:** 1MHz (typical)  
- **Efficiency:** Up to 90%  
- **Package:** 10-Lead LLP (3mm x 3mm)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
The LM2793LD is a compact, high-efficiency LED driver designed for backlighting applications in portable devices. It uses a charge pump architecture to provide constant current to three LED strings, eliminating the need for external inductors.  

### **Features:**  
- **Adjustable Brightness:** PWM dimming control (up to 25kHz)  
- **Low Dropout Operation:** Maintains regulation with low headroom  
- **Integrated Current Regulation:** No external resistors needed  
- **Automatic Soft-Start:** Reduces inrush current  
- **Thermal Shutdown Protection:** Prevents overheating  
- **Small Footprint:** Suitable for space-constrained designs  

This information is based on the manufacturer's datasheet. For detailed electrical characteristics and application circuits, refer to the official documentation.

Low Noise White LED Constant Current Supply with Dual Function Brightness Control