White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost The LM27953TL is a dual-output charge pump LED driver manufactured by National Semiconductor (NS). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** National Semiconductor (NS)  
- **Part Number:** LM27953TL  
- **Type:** Dual-output charge pump LED driver  
- **Input Voltage Range:** 2.7V to 5.5V  
- **Output Current per Channel:** Up to 30mA  
- **Number of Outputs:** 2 (dual independent outputs)  
- **Efficiency:** Up to 90%  
- **Switching Frequency:** 1MHz (typical)  
- **Package:** Thin SOT-23 (6-pin)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**
- The LM27953TL is a compact, high-efficiency charge pump designed to drive two LEDs independently.  
- It provides regulated current outputs without requiring external inductors, making it suitable for space-constrained applications.  
- The device includes built-in soft-start and thermal shutdown protection.  

### **Features:**
- **Dual Independent Outputs:** Allows separate control of two LEDs.  
- **No External Inductors Required:** Simplifies PCB design.  
- **PWM Dimming Support:** Compatible with pulse-width modulation for brightness control.  
- **Low Dropout Operation:** Maintains efficiency even at low input voltages.  
- **Thermal Shutdown Protection:** Prevents overheating damage.  
- **Soft-Start Function:** Reduces inrush current during startup.  

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

White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost