LM317L

The LM317L is a positive voltage regulator from onsemi, designed for high-performance linear regulation in compact applications. It provides a stable output voltage adjustable from 1.25 V to 37 V with a maximum output current of 100 mA, making it ideal for low-power systems requiring precise voltage control. The device features built-in current limiting, thermal shutdown protection, and safe-area compensation, ensuring reliable operation under adverse conditions. This regulator operates with a minimal dropout voltage—typically 1.5 V at full load—which enhances efficiency and allows it to function effectively even when input and output voltages are closely matched. Its internal reference voltage of 1.25 V is highly stable over temperature and time, contributing to consistent output accuracy. Additionally, the LM317L includes an adjustable current limit feature that can be externally set using a single resistor, offering flexibility in circuit design and component protection. Designed for space-constrained environments, the LM317L comes in a TO-92 package, which is cost-effective and suitable for surface-mount or through-hole mounting. It supports both fixed and adjustable configurations, enabling use in a wide range of power supply designs—from battery-powered devices to precision instrumentation. The device also maintains low ripple rejection (typically 60 dB at 120 Hz), minimizing noise in sensitive analog circuits. Common applications include portable electronics, sensor biasing, microcontroller power supplies, and small DC-DC conversion systems where simplicity, stability, and minimal external components are essential. Due to its robust protection mechanisms and efficient regulation, the LM317L is well-suited for industrial, consumer, and automotive electronics operating in harsh environments. Its compatibility with standard resistive divider networks for output voltage adjustment simplifies integration into existing designs without requiring complex feedback loops. Moreover, the regulator’s low quiescent current ensures minimal power loss during standby or idle modes, enhancing energy efficiency in battery-operated systems. Overall, the LM317L delivers a balance of performance, reliability, and ease of use in low-current, regulated power applications.