STMicroelectronics LD1117STR Adjustable Linear Voltage Regulator 800mA 15V SOT-223 Package

STMicroelectronics LD1117STR: High-Performance Adjustable Linear Voltage Regulation

The LD1117STR from STMicroelectronics represents a cutting-edge solution for precise voltage regulation in modern electronic systems. This adjustable linear regulator delivers exceptional performance with its 800mA output current capability and wide 1.25V to 15V adjustable output range, making it an ideal choice for demanding applications requiring stable power delivery.

Advanced Technical Specifications

Engineered with precision, the LD1117STR features a maximum input voltage of 15V with a minimum dropout voltage of just 1.2V at full load. Its high power supply rejection ratio (75dB at 120Hz) ensures minimal noise interference, while the integrated protection mechanisms safeguard against over-temperature and over-current conditions. The device's SOT-223 package combines compact form factor with excellent thermal management capabilities.

Design Advantages

Engineers benefit from the LD1117STR's versatile design that eliminates the need for external components in most configurations. Its inherent stability with any type of output capacitor makes it compatible with modern low-ESR ceramic capacitors while maintaining backward compatibility with traditional electrolytic solutions. The device's thermal shutdown circuitry automatically reduces output current during overheating conditions, preventing potential damage to connected components.

Industrial Applications

This precision regulator finds application across diverse industries including:

• Portable electronics requiring stable power supplies
• Industrial control systems needing precise voltage references
• Automotive electronics with fluctuating power demands
• Communication equipment requiring clean power delivery

Package Innovation

The SOT-223 package offers significant advantages for surface-mount manufacturing processes. Its four-terminal configuration separates the power and signal paths, reducing ground noise and improving measurement accuracy. This packaging technology enables efficient heat dissipation while maintaining compatibility with standard reflow soldering techniques.

Reliability Features

STMicroelectronics' LD1117STR incorporates multiple protection systems:

• Built-in current limiting prevents damage from short circuits
• Thermal shutdown protects against overheating
• Reverse bias protection safeguards during power-down sequences
• Input transient protection maintains stability during voltage spikes

These features combine to create a robust solution that maintains functionality under adverse operating conditions, significantly improving system reliability.

Performance Optimization

The regulator's low quiescent current (5mA maximum) contributes to energy efficiency, particularly important in battery-powered applications. Its adjustable output design allows customization for specific voltage requirements without compromising performance metrics. Designers can achieve optimal results by selecting appropriate external resistors while maintaining the device's inherent stability characteristics.

Tags: Linear Voltage Regulator, Adjustable Power Supply, SOT-223 IC, High-Current Regulator, Industrial Electronics