1A Low Dropout Regulator for 5V to 3.3V Conversion 4-SOT-223 -40 to 125 The **LM3940IMP-3.3/NOPB** is a **3.3V, 1A low-dropout (LDO) voltage regulator** manufactured by **National Semiconductor (NSC)**.  

### **Key Specifications:**  
- **Output Voltage:** 3.3V (fixed)  
- **Output Current:** 1A (maximum)  
- **Dropout Voltage:** 0.5V (typical at 1A load)  
- **Input Voltage Range:** 4.5V to 7V  
- **Line Regulation:** 0.025% (typical)  
- **Load Regulation:** 0.05% (typical)  
- **Quiescent Current:** 10mA (typical)  
- **Package:** TO-263 (D²PAK)  
- **Operating Temperature Range:** -40°C to +125°C  

### **Features:**  
- Low dropout voltage for efficient power conversion  
- Thermal shutdown and current limit protection  
- Stable with low-ESR capacitors  
- Designed for 5V to 3.3V conversion  
- Suitable for battery-powered applications  

This regulator is commonly used in **microprocessor power supplies, portable devices, and embedded systems** requiring a stable 3.3V supply from a 5V input.

1A Low Dropout Regulator for 5V to 3.3V Conversion 4-SOT-223 -40 to 125