TPS5450

The Texas Instruments TPS5450 is a high-output-current PWM converter designed for step-down (buck) applications. It features a wide input voltage range from 5.5 V to 36 V and can deliver up to 5 A of continuous output current, with a peak capability of 6 A. The device integrates a low-resistance, high-side N-channel MOSFET, contributing to high efficiency greater than 90% and enabling a compact design.

The TPS5450 allows for an adjustable output voltage, configurable down to 1.22 V with an initial accuracy of 1.5%. It operates at a fixed switching frequency of 500 kHz, which helps in reducing the size of external filter components. The internal compensation circuitry minimizes the need for external parts, simplifying the design process.

For system protection, the TPS5450 includes overcurrent limiting, overvoltage protection, and thermal shutdown features. It also offers a low shutdown supply current of 18 μA when the ENA pin is used. The device operates within a junction temperature range of -40°C to 125°C and is available in a thermally enhanced 8-pin SOIC PowerPAD package, suitable for surface mount applications.

Key applications for the TPS5450 include high-density point-of-load regulators, LCD and plasma displays, and distributed power systems for 12-V and 24-V rails.