The MP5403B is a monolithic power management unit containing two high-efficiency, step-down, switching converters and a load switch. The two regulators supply peak currents up to 5A and 4A separately, and the load switch supplies up to 3A of load current with an extremely low RDS(ON). With an input range of up to 6V, the MP5403B is ideal for powering ASIC and SOC for solid-state drives (SSD) and other compact power systems. The peak-current-mode control scheme with pulse-skip mode operation provides the two switchers with fast transient response, high light-load efficiency, and a minimal number of capacitors by using an interleaving PWM clock between the two switchers. The 3A load switch with a low 20mΩ on resistance provides flexible system configuration. A full set of enable control pins and power good open-drain indicators allow for easy implementation of the start-up and shutdown sequences. Full protection features include over-current protection (OCP) and thermal shutdown. The MP5403B requires a minimal number of readily available, standard, external components and is available in a small UTQFN-20 (2.5mmx3mm) package.
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