300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown The LT1521IS8-3.3#PBF is a low dropout (LDO) linear regulator manufactured by Linear Technology (now part of Analog Devices).  

### **Specifications:**  
- **Output Voltage:** 3.3V (fixed)  
- **Output Current:** 500mA  
- **Dropout Voltage:** 300mV (typical at 500mA load)  
- **Input Voltage Range:** 3.8V to 20V  
- **Quiescent Current:** 1mA (typical)  
- **Shutdown Current:** <1µA  
- **Line Regulation:** 0.02%/V (typical)  
- **Load Regulation:** 0.04%/mA (typical)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** 8-Lead SOIC  

### **Descriptions & Features:**  
- **Low Dropout Voltage:** Ensures efficient regulation even with small input-output differentials.  
- **Low Quiescent Current:** Reduces power consumption in battery-operated applications.  
- **Thermal Overload Protection:** Prevents damage due to excessive heat.  
- **Reverse Battery Protection:** Safeguards the regulator if the input polarity is reversed.  
- **No Protection Diodes Needed:** Internal circuitry eliminates the need for external protection diodes.  
- **Stable with Low-ESR Capacitors:** Works reliably with ceramic or tantalum output capacitors.  
- **Fast Transient Response:** Maintains stable output under dynamic load conditions.  
- **Applications:** Battery-powered devices, portable electronics, industrial controls, and automotive systems.  

This regulator is designed for high-performance, low-noise power supply applications.

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown