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LM2794BL from NS,National Semiconductor

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LM2794BL

Manufacturer: NS, NSC

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

Partnumber Manufacturer Quantity Availability
LM2794BL NS, NSC 2622 In Stock

Description and Introduction

Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control The LM2794BL is a charge pump-based LED driver manufactured by National Semiconductor (NSC). Below are its specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** 2.7V to 5.5V  
- **Output Current:** Up to 32mA per channel (adjustable)  
- **Number of Channels:** 3  
- **Switching Frequency:** ~1MHz  
- **Efficiency:** Up to 90%  
- **Package:** 10-pin LLP (Leadless Leadframe Package)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
The LM2794BL is a high-efficiency, fixed-frequency charge pump designed to drive up to three white LEDs with constant current. It eliminates the need for external inductors, making it suitable for space-constrained applications. The device includes an internal current regulator for uniform brightness across LEDs.  

### **Features:**  
- No external inductors required  
- Adjustable output current via external resistor  
- Low dropout operation  
- Soft-start feature to limit inrush current  
- Thermal shutdown protection  
- Low quiescent current in shutdown mode (<1µA)  
- Compatible with PWM dimming  

The LM2794BL is commonly used in portable electronics, such as mobile phones, PDAs, and handheld devices, for backlighting applications.

Application Scenarios & Design Considerations

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

Alternative Part Number

  • TPS60230DGSR --: Charge-pump white LED driver with regulated current outputs, functionally similar to the LM2794BL and widely available from TI.
  • MAX1574ETB+T --: Inductorless charge-pump LED driver in a small package, suitable as a drop-in functional replacement for display backlight applications.
  • CAT3644HV3-GT2 --: Low-noise fractional charge-pump LED driver with similar output current capability and small footprint, offering a cost-effective alternative.

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