1 Features

1• 3.5- to 28-V Input Voltage Range

• Adjustable Output Voltage Down to 0.8 V

• Integrated 80-mΩ High-Side MOSFET Supports

up to 2 A Continuous Output Current

• High Efficiency at Light Loads with a Pulse

Skipping Eco-mode™

• Fixed 570-kHz Switching Frequency

• Typical 1-μA Shutdown Quiescent Current

• Adjustable Slow-Start Limits Inrush Currents

• Programmable UVLO Threshold

• Overvoltage Transient Protection by•

Cycle-by-Cycle Current Limit, Frequency Fold

Back and Thermal Shutdown Protection

• Available in Easy-to-Use SOIC8 Package

• Supported by WEBENCH® Software Tool

(www.TI.com/WEBENCH)

2 Applications

• Consumer Applications such as Set-Top Boxes,

CPE Equipment, LCD Displays, Peripherals, and

Battery Chargers

• Industrial and Car Audio Power Supplies

• 5-V, 12-V and 24-V Distributed Power Systems

3 Description

The TPS54231 device is a 2-V, 2-A non-synchronous

buck converter that integrates a low RDS(on) high-side MOSFET. To increase efficiency at light loads, a

pulse skipping Eco-mode™ feature is automatically

activated. Furthermore, the 1-μA shutdown supply

current allows the device to be used in battery

powered applications. Current mode control with

internal slope compensation simplifies the external

compensation calculations and reduces component

count while allowing the use of ceramic output

capacitors. A resistor divider programs the hysteresis

of the input undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoots

during startup and transient conditions. A cycle-by•

cycle current limit scheme, frequency fold back and

thermal shutdown protect the device and the load in

the event of an overload condition. The TPS54231 device is available in an 8-pin SOIC package that has

been internally optimized to improve thermal

performance.