RT7249

® RT7249 3A, 18V Synchronous Step-Down Converter with Adjustable Current Limited Power Switch General Description 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. Cycleby-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. Marking Information 1A=YM DNN 1A= : Product Code YMDNN : Date Code Features z Buck Regulator ` 4.5V to 18V Input Voltage Range ` 3A Output Current ` Internal N-Channel MOSFETs ` Current Mode Control ` Adjustable PWM Frequency ` Adjustable Output from 0.8V to 15V ` Adjustable Soft-Start Time ` Stable with Ceramic Output Capacitors ` Cycle-by-Cycle Current Limit ` Input Under-Voltage Lockout ` Output Under-Voltage Protection ` Thermal Shutdown z Power Switch ` ±15% Current-Limit Accuracy at 1.2A ` Adjustable Current Limit : 75mA to 2580mA ...