TPS43351-Q1

The TPS43351-Q1 is a high-efficiency, synchronous buck converter designed for automotive applications, offering robust performance in demanding environments. It supports input voltages ranging from 4.5 V to 28 V, making it suitable for both 12 V and 24 V vehicle systems. The device delivers up to 5 A of continuous output current and features an integrated high-side and low-side MOSFET, simplifying design and reducing external component count. This converter operates with a fixed frequency of 500 kHz, enabling efficient power delivery while minimizing electromagnetic interference (EMI). Its wide operating range and low quiescent current enhance system efficiency across various load conditions, including light-load scenarios. The TPS43351-Q1 includes advanced protection features such as over-current protection (OCP), over-voltage protection (OVP), thermal shutdown, and under-voltage lockout (UVLO), ensuring safe operation under fault conditions. Designed for automotive qualification (AEC-Q100 Grade 1), the TPS43351-Q1 meets stringent reliability standards required for harsh environments like engine compartments or powertrain systems. It also supports adaptive voltage positioning (AVP) to improve transient response and maintain stable output during rapid load changes—a critical requirement in modern automotive electronics. The device offers flexible configuration options via an I²C interface, allowing for dynamic adjustment of output voltage, switching frequency, and operational modes. This enables system-level optimization and reduces development time through software-based tuning. Additionally, its compact QFN package (3 mm × 3 mm) facilitates space-efficient PCB layouts, which is essential in densely packed automotive control units. Common applications include infotainment systems, ADAS (Advanced Driver Assistance Systems), telematics, and microcontroller power supplies in vehicles. Its ability to operate reliably under extreme temperatures—from -40°C to +125°C—makes it ideal for use in both cabin and exterior modules. With built-in soft-start and pre-bias start capability, the TPS43351-Q1 ensures smooth power-up sequences and prevents inrush currents that could destabilize the system.