The MP9459 is a fully integrated, high-frequency, synchronous, rectified, step-down, switch-mode converter with internal power MOSFETs. The device is a compact solution that achieves 4A of output current over a wide input range with excellent load and line regulation. It uses synchronous mode operation for higher efficiency over the output current load range.

Constant-on-time (COT) control operation provides very fast transient response, easy loop design, and very tight output regulation.

Full protection features include short-circuit protection (SCP), over-current protection (OCP), under-voltage protection (UVP), and thermal shutdown.

The MP9459 requires a minimal number of readily available, standard external components. It is available in a space-saving SOT563 (1.6mmх1.6mm) package.