L9369

The L9369 is a high-efficiency, monolithic power management IC designed by STMicroelectronics for automotive and industrial applications. It integrates a 5V linear regulator, a low-dropout (LDO) voltage regulator, and a programmable current limiter, enabling compact and reliable power solutions in space-constrained environments. The device operates from an input voltage range of 4.5V to 36V, making it suitable for systems with varying supply conditions such as those found in vehicle electrical networks. Core features include a fixed output voltage of 5V at up to 1A from the main regulator, along with an adjustable LDO that can provide outputs between 2.5V and 5V at up to 150mA. This dual-regulator architecture allows efficient distribution of power to different subsystems within a single chip—such as microcontrollers, sensors, or communication modules—without requiring external components for basic regulation. The integrated current limit protection prevents damage under short-circuit or over-load conditions, enhancing system robustness. The L9369 also includes thermal shutdown protection and over-current protection mechanisms, ensuring safe operation across wide temperature ranges (-40°C to +150°C junction temperature). Its robust design complies with AEC-Q100 Grade 1 qualification standards, confirming suitability for harsh automotive environments including vibration, electromagnetic interference (EMI), and extreme temperature cycling. Additionally, the device features a shutdown pin for low-power modes, reducing quiescent current to less than 10 µA when inactive, which is critical for energy-efficient designs in battery-powered systems. Applications include automotive body control modules, infotainment systems, telematics units, and industrial control equipment where stable, clean power delivery is essential. It supports functions such as sensor biasing, microcontroller powering, and peripheral regulation in ECU (Electronic Control Unit) architectures. With its compact 8-pin SO8 package and minimal external component count, the L9369 simplifies PCB layout while maintaining high reliability and performance. This IC is ideal for designers seeking a cost-effective, fully integrated solution that meets stringent automotive requirements without sacrificing flexibility or efficiency. Its ability to manage multiple voltage rails from a single input makes it particularly valuable in modern embedded systems demanding both simplicity and resilience.