G5797

Global Mixed-mode Technology G5796/G5796A G5797/G5797A 500kHz 2A/3A Synchronous Step-down DC/DC Features „ 2A/3A Output Current „ 0.1Ω Internal Power MOSFET Switch „ Stable with Low ESR Output Ceramic Capaci- tors „ Up to 95% Efficiency „ 32µA Shutdown Mode „ Fixed 500kHz Frequency „ Thermal Shutdown „ Cycle-by-Cycle Over Current Protection „ Wide 4.5V to 24V Operating Input Range „ Output Adjustable from 0.92V to 21.6V „ Available in SOP-8/SOP-8 (FD) Package „ Build in skip mode at light loading in G5796A/G5797A Applications „ DSL Modems „ Distributed Power Systems „ Pre-Regulator for Linear Regulators General Description The G5796/G5797 is a monolithic step-down switch mode regulator with a built in internal power MOSFET. It achieves 2A/3A continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. Provide skip mode in G5796A/G5797A. When loading too light clock skip several cycle proportional to load. Fault condition protection includes cycle-by-cycle current limiting, output short circuit protection and thermal shutdown. In shutdown mode the regulator draws 32µA of supply current. Programmable soft-start overwrites the internal soft-start for various requirement of output power up ramp and minimizes the inrush supply current at initial startup. The G5796/G5797 requires a minimum number of readily available standard external components. It is avai...