LM74900-Q1

The LM74900-Q1 is a high-efficiency, automotive-grade buck-boost DC-DC converter designed for demanding power management applications in electric and hybrid vehicles. It supports an input voltage range from 4.5 V to 36 V, making it suitable for both 12 V and 48 V automotive systems. The device delivers up to 10 A of continuous output current with excellent thermal performance, enabling reliable operation across wide ambient temperature conditions—from -40°C to +125°C. This regulator features integrated high-side and low-side MOSFETs, reducing external component count and simplifying design while improving system efficiency. It operates in either buck or boost mode depending on the input-to-output voltage relationship, ensuring stable output regulation regardless of input fluctuations—a critical requirement in automotive environments where battery voltages can vary significantly during engine start-up, load transients, or regenerative braking events. The LM74900-Q1 includes advanced protection mechanisms such as over-current protection (OCP), over-voltage protection (OVP), under-voltage lockout (UVLO), and thermal shutdown. These features enhance system reliability and safety, particularly in harsh automotive environments. Its programmable switching frequency (from 200 kHz to 2 MHz) allows designers to optimize efficiency and minimize electromagnetic interference (EMI), which is essential for meeting stringent automotive EMI standards like CISPR 25. The device supports remote sensing for precise output voltage regulation, minimizing voltage drops across PCB traces and connectors—critical for maintaining accuracy in distributed power architectures. Additionally, it offers a pin-selectable soft-start function and adjustable output voltage via an external resistor divider, providing flexibility for various system requirements. Designed to meet AEC-Q100 Grade 1 qualification, the LM74900-Q1 is ideal for use in infotainment systems, ADAS sensors, telematics modules, cabin electronics, and other automotive subsystems that require robust, compact, and efficient power solutions. Its high integration level reduces board space and BOM cost while improving overall system performance.