L9679E

The L9679E is a high-performance, low-power voltage regulator designed by STMicroelectronics for automotive and industrial applications. It operates with an input voltage range from 4.5 V to 36 V, making it suitable for systems with varying power supply conditions. The device delivers a stable output voltage of 3.3 V with a maximum output current of 1 A, ensuring reliable operation under load fluctuations. This regulator features built-in protection mechanisms including over-current protection (OCP), thermal shutdown (TSD), and under-voltage lockout (UVLO). These safeguards enhance system reliability and prevent damage due to abnormal operating conditions. Additionally, the L9679E includes a soft-start function that limits inrush current during startup, reducing stress on the power supply and connected components. Designed for compact integration, the L9679E is packaged in a small, thermally enhanced SO8 package, enabling efficient heat dissipation while minimizing PCB footprint. Its quiescent current is as low as 250 µA, contributing to energy efficiency in battery-powered or always-on systems. The device supports both fixed and adjustable configurations through external resistors, offering flexibility in system design. Common applications include automotive infotainment systems, ECUs (Electronic Control Units), industrial control modules, and IoT edge devices where robust power management is critical. It is particularly suited for environments with harsh electrical conditions, such as those found in vehicle electrical systems with load dump and cold crank scenarios. The L9679E also incorporates a precision bandgap reference and a high-gain error amplifier, ensuring excellent line and load regulation performance. Its wide operating temperature range—from -40°C to +125°C—makes it ideal for demanding industrial and automotive environments. Furthermore, the device complies with AEC-Q100 qualification standards, confirming its suitability for automotive-grade applications. With its combination of robust protection, low power consumption, and high reliability, the L9679E serves as a dependable solution for powering sensitive digital circuits in complex electronic systems where stability and safety are paramount.