DESCRIPTION
The LTC®3534 is a wide VIN range, highly efficient, fixed frequency, buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for multi-cell Alkaline/NiMH or single Lithium-Ion/Polymer applications where the output voltage is within the battery voltage range.

FEATURES
■ Regulated Output with Input Voltages Above, Below or Equal to the Output
■ 2.4V to 7V VIN and 1.8V to 7V VOUT Ranges
■ 5V VOUT at 500mA from 4 AA Cells
■ Single Inductor
■ Synchronous Rectification: Up to 94% Efficiency
■ Burst Mode® Operation with 25µA IQ
■ Output Disconnect in Shutdown
■ 1MHz Switching Frequency
■ <1µA Shutdown Current
■ Small Thermally Enhanced 16-Lead (5mm × 3mm × 0.75mm) DFN and 16-Lead GN Packages

APPLICATIONS
■ Medical Instruments
■ Portable Barcode Readers
■ Portable Inventory Terminals
■ USB to 5V Supply
■ Handheld GPS