LTC1574

U U LTC1574 LTC1574-3.3/LTC1574-5 High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode FEATURES DESCRIPTIO s High Efficiency: Up to 94% s Usable in Noise-Sensitive Products s Peak Inductor Current Independent of Inductor Value s Short-Circuit Protection s Internal Low Forward Drop Schottky Diode s Only Three External Components Required s Wide VIN Range: 4V to 18.5V (Absolute Maximum) s Low Dropout Operation s Low-Battery Detector s Pin Selectable Current Limit s Internal 0.9Ω Power Switch: VIN < 11V s Standby Current: 130µA s Active Low Micropower Shutdown U APPLICATIO S s Inverting Converters s Step-Down Converters s Memory Backup Supply s Portable Instruments s Battery-Powered Equipment s Distributed Power Systems and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. The LTC®1574 is a family of easy-to-use current mode DC/DC converters ideally suited for 9V to 5V, 5V to 3.3V and inverting operation. With an internal 0.9Ω switch (at a supply voltage of 12V) and a low forward drop Schottky diode (0.450V typ at 200mA, TA = 25°C), the LTC1574 requires only three external components to construct a complete high efficiency DC/DC converter. Under no load condition, the LTC1574 draws only 130µA. In shutdown, it draws a mere 2µA making this converter ideal for battery-powered applications. In dropout, the internal P-channel MOSFET switch is turned on continuously allowing the user to maximize the life of the battery source...