3.5V to 28V Input, 5A, 570kHz Step-Down Converter with Eco-mode

The TPS54531 device is a 28-V, 5-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 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.