Very low quiescent BiCMOS voltage regulator The **ST1L05CPU33R** is a low-dropout (LDO) voltage regulator manufactured by **STMicroelectronics**.  

### **Key Specifications:**  
- **Output Voltage:** 3.3V (fixed)  
- **Output Current:** Up to 500mA  
- **Dropout Voltage:** Typically 300mV at full load  
- **Input Voltage Range:** 2.5V to 6.0V  
- **Low Quiescent Current:** Typically 50µA  
- **High PSRR (Power Supply Rejection Ratio):** 70dB at 1kHz  
- **Thermal Shutdown & Current Limitation Protection**  
- **Package:** SOT-23-5L  

### **Features:**  
- Stable with low-ESR ceramic capacitors  
- Low noise performance  
- Fast transient response  
- Suitable for battery-powered applications  
- RoHS compliant  

This regulator is designed for applications requiring a stable 3.3V supply with low power consumption, such as portable devices and embedded systems.  

(Source: STMicroelectronics datasheet)

Very low quiescent BiCMOS voltage regulator