L9963E

The L9963E is a high-efficiency, dual-channel buck converter IC designed by STMicroelectronics for power management in automotive and industrial applications. It delivers up to 3A output current per channel and supports input voltages ranging from 4.5V to 28V, making it suitable for systems with varying power supply conditions. The device features integrated N-channel MOSFETs, reducing external component count and improving system reliability while maintaining compact PCB footprint. This converter operates with fixed-frequency PWM control at 1 MHz, enabling efficient switching with minimal electromagnetic interference (EMI). Its synchronous rectification design enhances efficiency across a wide load range, particularly beneficial in battery-powered or energy-sensitive environments. The L9963E includes built-in protections such as over-current protection (OCP), over-temperature shutdown (OTSD), and under-voltage lockout (UVLO), ensuring robust operation under fault conditions and preventing damage to both the IC and connected circuits. Designed for automotive use, the L9963E meets AEC-Q100 Grade 1 qualification standards, offering high reliability in harsh environments including temperature extremes from -40°C to +150°C. It supports flexible configuration through an I²C interface, allowing real-time monitoring and adjustment of output voltage, switching frequency, and fault response settings. This feature simplifies system integration and enables dynamic power management strategies tailored to specific application needs. Applications include infotainment systems, ADAS modules, ECU power supplies, and industrial automation equipment where stable, efficient, and reliable power delivery is critical. The device’s ability to drive two independent loads simultaneously makes it ideal for powering microcontrollers, sensors, and communication interfaces within a single package. Its low quiescent current and high efficiency reduce heat dissipation, enhancing thermal performance in confined spaces. In addition to its core functionality, the L9963E offers soft-start capability to minimize inrush current during startup and support for spread-spectrum frequency modulation to further reduce EMI emissions. These features make it compliant with stringent EMC regulations commonly found in automotive and industrial sectors. With a small 4mm x 4mm WQFN package, the L9963E provides a space-efficient solution without compromising on performance or safety.