L9663

The L9663 is a high-performance power management IC manufactured by STMicroelectronics, specifically designed for automotive and industrial applications requiring robust voltage regulation and system protection. It operates as a step-down (buck) converter with integrated high-side and low-side MOSFETs, enabling efficient DC-DC conversion from input voltages up to 40 V down to regulated output levels typically ranging from 1.8 V to 5.0 V. The device supports peak current mode control, ensuring fast transient response and stable operation under varying load conditions. Key features include programmable switching frequency (from 200 kHz to 2 MHz), which allows optimization of efficiency and external component size based on design requirements. It offers built-in over-current protection (OCP), over-voltage protection (OVP), thermal shutdown, and undervoltage lockout (UVLO), enhancing system reliability in harsh environments. The L9663 also includes soft-start functionality to limit inrush current during startup, reducing stress on the power supply and connected components. Designed for automotive use, the L9663 meets AEC-Q100 Grade 1 qualification, making it suitable for applications such as infotainment systems, ADAS modules, ECU power supplies, and body control units. Its compact footprint and minimal external component count simplify PCB layout and reduce overall system cost. The device supports both fixed and adjustable output voltage configurations via an external resistor divider, offering flexibility in system design. The L9663 incorporates advanced digital control algorithms that improve efficiency across a wide range of loads, including light-load conditions where traditional converters often suffer from reduced performance. This makes it ideal for always-on or low-power standby modes common in modern vehicle electronics. Additionally, its high integration reduces the need for discrete components, improving electromagnetic compatibility (EMC) and minimizing board space. With a wide operating temperature range from -40°C to +150°C, the L9663 is well-suited for extreme environmental conditions typical in automotive and industrial settings. Its robust protection mechanisms ensure long-term operational safety, while the internal current sensing and precise feedback loop provide accurate output regulation even under transient load spikes. The device is available in a thermally enhanced 16-pin TSSOP package, facilitating easy mounting and heat dissipation in high-density designs.