3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode

The TPS54331 device is a 28-V, 3-A

non-synchronous buck converter that integrates a low R DS(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 start-up

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 overload

condition. The TPS54331 device is available in an 8-pin SOIC package and 8-pin SO

PowerPAD integrated circuit package that have been internally optimized to improve

thermal performance.