DESCRIPTION
The LTC®3531/LTC3531-3.3/LTC3531-3 are synchronous buck-boost DC/DC converters that operate from input voltages above, below or equal to the output voltage. The topology incorporated in the ICs provides a continuous transfer through all operating modes, making the product ideal for single cell Li-Ion and multicell alkaline or nickel applications. The converters operate in Burst Mode, minimizing solution footprint and component count as well as providing high conversion effi ciency over a wide range of load currents.

FEATURES
■ Regulated Output with Input Above, Below or Equal to the Output
■ Single Inductor
■ Up to 90% Effi ciency
■ VIN Range: 1.8V to 5.5V
■ 200mA at 3.3VOUT from 3.6V Input
■ 125mA at 3VOUT from 2.5V Input
■ Fixed VOUT Versions (TSOT, DFN): 3.3V, 3V
■ Adjustable VOUT Version (DFN): 2V to 5V
■ Burst Mode® Operation, No External Compensation
■ Ultra Low Quiescent Current: 16μA, Shutdown Current <1μA
■ Only 3 External Components Required (Fixed Voltage Versions)
■ Short-Circuit Protection
■ Output Disconnect in Shutdown
■ Available in 6-Pin ThinSOT and 3mm × 3mm DFN Packages

APPLICATIONS
■ Handheld Instruments
■ MP3 Players
■ Handheld computers
■ PDA/GPS