STMicroelectronics LD1117DTTR Adjustable Linear Voltage Regulator

Advanced Power Management with STMicroelectronics LD1117DTTR

In modern electronics, precision voltage regulation remains a cornerstone of reliable circuit design. The LD1117DTTR from STMicroelectronics emerges as a versatile solution for engineers seeking adaptable power management capabilities. This DPAK-packaged linear regulator combines adjustable output parameters with robust thermal protection, making it suitable for applications ranging from industrial control systems to consumer electronics.

Key Technical Advantages

Engineered for performance-critical environments, this IC delivers an 800mA output current while maintaining exceptional stability across varying loads. Its 1.25V to 15V adjustable output range provides flexibility for diverse power supply architectures, complemented by a maximum 1.2V dropout voltage at full load. The device's 75dB PSRR at 120Hz ensures minimal ripple transmission, preserving signal integrity in noise-sensitive applications.

The integrated thermal shutdown and overcurrent protection mechanisms create a safety net for demanding operating conditions. These features automatically engage when temperatures exceed safe thresholds or current demands surpass specifications, preventing potential component damage while maintaining system stability.

Design Flexibility and Integration

Manufactured in the space-saving TO-252-3 (DPAK) surface-mount package, the LD1117DTTR optimizes board space while facilitating efficient thermal dissipation. Its 5mA quiescent current consumption enhances energy efficiency, particularly in battery-powered systems where power conservation is paramount. The absence of external components for basic operation simplifies design implementation while maintaining configurability through standard resistor dividers.

Engineers appreciate the regulator's compatibility with various input sources, including unregulated power supplies and battery arrays. The device's inherent stability with ceramic capacitors further reduces BOM complexity and cost, aligning with modern design trends favoring compact solutions.

Applications and Implementation

From test equipment requiring precise voltage references to embedded systems needing stable power rails, this regulator proves its versatility. It excels in distributed power architectures where multiple regulated voltages must coexist on a single PCB. Typical deployments include FPGA power supplies, sensor interface modules, and portable medical devices where reliability cannot be compromised.

When integrating the LD1117DTTR into new designs, consider implementing standard decoupling capacitors at both input and output to ensure stability. While the device maintains stability with ceramic capacitors, selecting components with appropriate voltage coefficients and temperature ratings guarantees optimal performance across the operating range.

Tags: Power Management IC, Surface Mount Regulator, Thermal Protected Voltage Regulator, Industrial Power Supply, Electronics Component