1 Features

• 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 5-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

• Cycle-by-cycle current-limit, frequency fold back,

and thermal shutdown protection

• Available in easy-to-use thermally enhanced

8-pin SO PowerPAD™ integrated circuit package

• Use TPS56637 for higher efficiency in a smaller

package

• Create a custom design using the TPS54531 with

the WEBENCH® Power Designer

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 TPS54531 device is a 28-V, 5-A nonsynchronous

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

TPS54531 device is available in 8-pin SO PowerPAD

integrated circuit package that has been internally

optimized to improve thermal performance.