1FEATURES

2• Qualified for Automotive Applications

• 3.5V to 28V Input Voltage Range

• Adjustable Output Voltage Down to 0.8V

• Integrated 80 mΩ High Side MOSFET Supports

up to 3A Continuous Output Current

• High Efficiency at Light Loads with Pulse

Skipping Eco-mode™ Control

• Fixed 570kHz Switching Frequency

• Typical 1mA Shutdown Quiescent Current

• Adjustable Slow Start Limits Inrush Currents

• Programmable UVLO Threshold

• Overvoltage Transient Protection

• Cycle-by-Cycle Current Limit, Frequency Fold

Back and Thermal Shutdown Protection

• Available in Easy-to-Use SOIC8 Package

• Supported by SwitcherPro™ Software Tool

(http://focus.ti.com/docs/toolsw/folders/print/s

witcherpro.html)

• For SWIFT™ Documentation, See the TI

Website at www.ti.com/swift

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

DESCRIPTION

The TPS54331 is a 28-V, 3-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 mA 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 under-voltage 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 TPS54331 is

available in an 8-pin SOIC package that has been

internally optimized to improve thermal performance.