RT7257A

® RT7257A 3A, 18V, 340kHz Synchronous Step-Down Converter General Description The RT7257A is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 18V input supply. The RT7257A's current mode architecture and external compensation allow the transient response to be optimized over a wide input range and loads. Cycle-bycycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start-up. The RT7257A also provides under voltage protection and thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7257A is available in an SOP-8 (Exposed Pad) package. Ordering Information RT7257A Package Type SP : SOP-8 (Exposed Pad-Option 1) Lead Plating System Z : ECO (Ecological Element with Halogen Free and Pb free) H : UVP Hiccup L : UVP Latch-Off Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. Marking Information RT7257Ax ZSPYMDNN RT7257AxZSP : Product Number x : H or L YMDNN : Date Code Features z ±1.5% High Accuracy Reference Voltage z 4.5V to 18V Input Voltage Range z 3A Output Current z Integrated N-MOSFET Switches z Current Mode Control z Fixed Frequency Operation : 340kHz z Output Adjustable from 0.8V to 15V z Up to 95% Effi...