DESCRIPTION
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.

FEATURES
■ High Efficiency: Up to 94%
■ Usable in Noise-Sensitive Products
■ Peak Inductor Current Independent of Inductor Value
■ Short-Circuit Protection
■ Internal Low Forward Drop Schottky Diode
■ Only Three External Components Required
■ Wide VIN Range: 4V to 18.5V (Absolute Maximum)
■ Low Dropout Operation
■ Low-Battery Detector
■ Pin Selectable Current Limit
■ Internal 0.9Ω Power Switch: VIN < 11V
■ Standby Current: 130µA
■ Active Low Micropower Shutdown

APPLICATIONS
■ Inverting Converters
■ Step-Down Converters
■ Memory Backup Supply
■ Portable Instruments
■ Battery-Powered Equipment
■ Distributed Power Systems