3A, 18V Synchronous Step-Down Converter with Adjustable Current Limited Power Switch

The RT7249 is a high efficiency, monolithic synchronous step-down DC/DC converter with a power switch. The Buck converter can deliver up to 3A output current from 4.5V to 18V input supply. The RT7249's current-mode architecture and external compensation allow the transient response to be optimized over a wide input range and loads. Cycle-by-cycle current limit provides protections against shorted output and soft-start eliminates input current surge during start-up. The RT7249 also provides under-voltage protection and thermal shutdown. PWM frequency is adjustable by the ROSC pin and Power Switch current limit can also be adjusted by the RLIM pin. The low current (<3μA) in shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7249 is available in the WQFN-16L 4x4 package.