TI TPS54331DR

Step-DownБак3.5V28V3A

Overview

The TPS54331DR device is a 28-V, 3-A, step-down (buck) converter with an integrated high-side n-channel MOSFET. To improve performance during line and load transients, the device implements a constant-frequency,current mode control which reduces output capacitance and simplifies external frequency compensation design.

The TPS54331 device is a 28-V, 3-A non-synchronous buck converter that integrates a lowRDS(on) high-side MOSFET. To increase efficiency at light loads, a pulseskipping Eco-mode feature is automatically activated. Furthermore, the 1-μA shutdown supply-currentallows the device to be used in battery-powered applications. Current mode control with internalslope compensation simplifies the external compensation calculations and reduces component countwhile allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis ofthe input undervoltage lockout. An overvoltage transient protection circuit limits voltageovershoots during startup and transient conditions. A cycle-by-cycle current-limit scheme,frequency foldback and thermal shutdown protect the device and the load in the event of an overloadcondition. The TPS54331 device is available in an 8-pin SOIC package and 8-pin SO PowerPAD packagethat have been internally optimized to improve thermal performance.

Features

? Switching Frequency: 570 kHz

? Shutdown Quiescent Current: Typical 1-A

? Inrush currents are limited by a slow-start feature that can be adjusted.

? UVLO Threshold that can be programmed

? Protection Against Overvoltage Transients

Applications

? Set-Top Boxes, CPE Equipment, LCD Displays, Peripherals, and Battery Chargers are examples of consumer applications.

? Power Supplies for Industrial and Automotive Audio

? Distributed Power Systems (5-V, 12-V, and 24-V)