RT7257E

SacPower ÖÇÁª´´Ð Preliminary RT7257E 3A, 17V, 340kHz Synchronous Step-Down Converter General Description The RT7257E is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 17V input supply. The RT7257E's current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start-up. The RT7257E provides thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7257E is available in an SOP-8 (Exposed Pad) package. Features z z z z z z z z z z z z z z ±1.5% High Accuracy Feedback Voltage 4.5V to 17V Input Voltage Range 3A Output Current Integrated N-MOSFET Switches Current Mode Control Fixed Frequency Operation : 340kHz Output Adjustable from 0.8V to 15V Up to 95% Efficiency Programmable Soft-Start Stable with Low ESR Ceramic Output Capacitors Cycle-by-Cycle Over Current Protection Input Under Voltage Lockout Thermal Shutdown Protection RoHS Compliant and Halogen Free Ordering Information RT7257EN Package Type SP : SOP-8 (Exposed Pad-Option 2) Lead Plating System Z : ECO (Ecological Element with Halogen Free and Pb free) Note : Richtek products are : ` Applications z z z z z z Wireless AP/Router ...