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LM2794BLX from NS,National Semiconductor

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LM2794BLX

Manufacturer: NS

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control

Partnumber Manufacturer Quantity Availability
LM2794BLX NS 1627 In Stock

Description and Introduction

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control The LM2794BLX is a dual white LED charge pump designed by National Semiconductor (NS). Here are its key specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** National Semiconductor (NS)  
- **Type:** Dual White LED Charge Pump  
- **Input Voltage Range:** 2.7V to 5.5V  
- **Output Current:** Adjustable up to 32mA per LED  
- **Efficiency:** Up to 90%  
- **Switching Frequency:** 1MHz (typical)  
- **Package:** 10-pin LLP (Leadless Leadframe Package)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**
- The LM2794BLX is a high-efficiency charge pump designed to drive two white LEDs with constant current.  
- It uses a fractional charge pump (1.5x) to optimize power efficiency.  
- The device includes an internal current regulator to ensure uniform brightness across LEDs.  

### **Features:**
- **Dual Output:** Independently drives two white LEDs.  
- **PWM Dimming Control:** Supports brightness adjustment via PWM input.  
- **Low Noise Operation:** Minimizes interference in sensitive applications.  
- **Soft-Start Function:** Reduces inrush current during startup.  
- **Thermal Shutdown Protection:** Safeguards against overheating.  
- **No External Inductors Required:** Simplifies design and reduces board space.  

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

Application Scenarios & Design Considerations

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
Partnumber Manufacturer Quantity Availability
LM2794BLX LM 6000 In Stock

Description and Introduction

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control The LM2794BLX is a charge pump-based white LED driver manufactured by Texas Instruments.  

### **Specifications:**  
- **Input Voltage Range:** 2.7V to 5.5V  
- **Output Current:** Up to 30mA per LED (total of 120mA for four LEDs)  
- **Number of LED Channels:** 4  
- **Efficiency:** Up to 90%  
- **Switching Frequency:** 1MHz (typical)  
- **Dimming Control:** PWM (Pulse Width Modulation)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Type:** 10-pin LLP (3mm x 3mm)  

### **Description:**  
The LM2794BLX is a compact, high-efficiency LED driver designed for powering white LEDs in portable applications. It uses a charge pump architecture to regulate current without requiring an inductor, making it suitable for space-constrained designs.  

### **Features:**  
- **1x/1.5x/2x Automatic Charge Pump Modes** for optimized efficiency  
- **Independent Current Sinks** for each LED (30mA max per channel)  
- **Low Dropout Operation** for extended battery life  
- **Soft-Start Feature** to limit inrush current  
- **Thermal Shutdown Protection**  
- **No External Inductor Required**  

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

Application Scenarios & Design Considerations

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
Partnumber Manufacturer Quantity Availability
LM2794BLX NSC 245 In Stock

Description and Introduction

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control The LM2794BLX is a dual white LED charge pump with an integrated 1x/1.5x/2x charge pump and two independent current sinks, manufactured by National Semiconductor (NSC).  

### **Key Specifications:**  
- **Input Voltage Range:** 2.7V to 5.5V  
- **Output Current:** Up to 30mA per LED (adjustable)  
- **Efficiency:** Up to 90% (depending on mode)  
- **Charge Pump Modes:** 1x, 1.5x, 2x (automatic mode switching)  
- **LED Current Matching:** ±0.5% typical  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 10-pin LLP (3mm x 3mm)  

### **Features:**  
- Automatic charge pump mode selection for optimal efficiency  
- Independent current control for each LED  
- Low dropout current regulators  
- Soft-start to reduce inrush current  
- Thermal shutdown protection  
- No external inductors required  

This device is commonly used in backlighting applications for LCD displays in portable electronics.

Application Scenarios & Design Considerations

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control

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