TPS5420

The TPS5420 from Texas Instruments is a versatile 2A continuous output current step-down (buck) converter designed for a wide input voltage range of 5.5V to 36V. This integrated circuit features a high-efficiency design, achieving up to 95% efficiency due to its 110mΩ integrated MOSFET switch.

Key electrical specifications include a fixed 500kHz switching frequency, which aids in reducing the size of external filter components. The output voltage is adjustable down to 1.22V with an initial accuracy of 1.5%. The device incorporates internal compensation to minimize external parts count and includes features such as overcurrent limiting, overvoltage protection, and thermal shutdown for system protection.

The TPS5420 operates within a junction temperature range of -40°C to 125°C. It is available in a compact 8-pin SOIC package, suitable for surface mount applications. The device also features an undervoltage lockout circuit to prevent start-up until the input voltage reaches 5.5V and an internally set slow-start circuit to limit inrush currents.

Applications for the TPS5420 include consumer electronics like set-top boxes and LCD displays, as well as industrial and automotive power supplies, battery chargers, and high-power LED supplies. Its wide input range makes it suitable for 12V and 24V distributed power systems.