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.