DESCRIPTION
The LTC®3530 is a wide VIN range, highly efficient, fi xed 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 lithium-ion, two-cell alkaline or NiMH applications where the output voltage is within the battery voltage range.

FEATURES
■ Regulated Output with Input Voltages Above, Below
   or Equal to the Output
■ 1.8V to 5.5V Input and 1.8V to 5.25V Output Range
■ 250mA Continuous Output Current from 1.8V VIN
■ 600mA Continuous/1A Peak Output Current from
   Li-Ion
■ Single Inductor
■ Synchronous Rectifi cation: Up to 96% Effi ciency
■ Programmable Automatic Burst Mode® Operation
■ Output Disconnect in Shutdown
■ Pin Compatible with the LTC3440
■ Programmable Frequency from 300kHz to 2MHz
■ <1μA Shutdown Current
■ Small Thermally Enhanced 10-Lead (3mm × 3mm)
   DFN and 10-Lead MS Packages

APPLICATIONS
■ MP3 Players
■ Handheld Instruments
■ Digital Cameras
■ Smart Phones
■ Portable GPS Units
■ Miniature Hard Disk Drive Power