DESCRIPTION
The LTC®3533 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 single cell lithium-ion/polymer or multi-cell alkaline/NiMH applications where the output voltage is within the input voltage range.

FEATURES
■ Regulated Output with Input Voltages Above, Below or Equal to the Output
■ 1.8V to 5.5V (Input) and 5.25V (Output) Voltage Range
■ 0.8A Continuous Output Current: VIN > 1.8V
■ 2A Continuous Output Current: VIN > 3V
■ Single Inductor
■ Synchronous Rectifi cation: Up to 96% Effi ciency
■ Programmable Burst Mode® Operation: IQ = 40µA
■ Output Disconnect in Shutdown
■ Programmable Frequency from 300kHz to 2MHz
■ <1µA Shutdown Current
■ Small Thermally Enhanced 14-Lead (3mm × 4mm × 0.75mm) DFN package

APPLICATIONS
■ GSM Modems
■ Handheld Instruments
■ Digital Cameras
■ Smart Phones
■ Media Players
■ Miniature Hard Disk Drive Power