The LT1761ES550 from Linear Technology is a high-performance, low dropout voltage regulator designed to deliver a continuous output current of up to 100mA with an exceptionally low noise output, making it an ideal choice for sensitive RF and audio applications. Its low noise characteristics and power supply rejection ratio (PSRR) are complemented by a very low quiescent current, which enhances battery life in portable devices.

Key Features:

• Output Voltage: Fixed 5.5V
• Output Current: Up to 100mA
• Low Dropout Voltage: Only 300mV typical at full load
• Low Noise: 20μVRMS across a 10Hz to 100kHz bandwidth
• High PSRR: 76dB at 1kHz
• Low Quiescent Current: 20μA operating and 0.1μA in shutdown
• Stable with Low ESR Capacitors: Compatible with ceramic, tantalum, and aluminum electrolytic capacitors
• Adjustable Output: From 1.22V to 20V with external resistors
• Overcurrent and Overtemperature Protection: Ensures long-term reliability
• Small Package: Available in the tiny 5-lead TSOT-23 package

Applications:

The LT1761ES550 is versatile and can be used in a wide array of applications, particularly where power efficiency and noise sensitivity are critical. Common applications include:

• Portable and Battery-Powered Equipment
• Reference Voltage Sources
• Low Noise Instrumentation
• RF and Wireless Infrastructure
• Audio Applications

Conclusion:

With its combination of low dropout, low noise, and high PSRR, the LT1761ES550 is a robust voltage regulator that ensures clean and stable power. Its compatibility with various capacitor types and the ability to work under low quiescent current conditions make it a highly flexible solution for designing power-efficient and noise-critical electronic systems.