LMQ644A0-Q1

The LMQ644A0-Q1 is a high-performance automotive-grade power management IC manufactured by Texas Instruments, designed for efficient voltage regulation in demanding vehicle applications. It features a wide input voltage range of 4.5V to 28V, making it suitable for both 12V and 24V automotive systems, including start-stop and mild hybrid architectures. The device integrates a synchronous buck converter topology that delivers up to 4A continuous output current with high efficiency, minimizing power loss and thermal dissipation. This regulator offers precise output voltage control through an adjustable feedback pin, allowing flexibility in setting the output from 0.8V to 24V. It includes built-in protection mechanisms such as over-current protection (OCP), over-temperature shutdown (OTSD), and undervoltage lockout (UVLO), ensuring robust operation under fault conditions. Additionally, the LMQ644A0-Q1 supports soft-start functionality to reduce inrush current during startup, preventing stress on the power supply and connected components. Designed for compliance with AEC-Q100 Grade 1 standards, the LMQ644A0-Q1 is qualified for use in harsh automotive environments, including extreme temperature ranges from -40°C to +125°C. Its compact 3mm x 3mm WQFN package enhances board space efficiency while enabling easy integration into space-constrained designs. The device also features low quiescent current (typically 120µA), which improves system efficiency during idle or standby modes—critical for modern vehicles aiming to reduce parasitic power consumption. Common applications include infotainment systems, telematics units, ADAS sensors, cabin electronics, and ECU power supplies where stable, reliable power delivery is essential. The LMQ644A0-Q1’s robust design and comprehensive protection suite make it ideal for safety-critical automotive functions requiring long-term reliability and minimal maintenance. With its optimized switching frequency and low electromagnetic interference (EMI), this IC ensures clean power delivery without disrupting sensitive analog or digital circuits in the vehicle’s electronic architecture.