DESCRIPTION
The LTC®3444 is a highly efficient, fixed frequency, buckboost DC/DC converter, which operates from input voltages above, below, and 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 a single Lithium-Ion or multi-cell applications where the output voltage can vary over a wide range.

FEATURES
■ Optimized Features for WCDMA Handsets
■ Regulated Output with Input Voltages Above, Below, or Equal to the Output
■ 0.5V to 5V Output Range
■ Up to 400mA Continuous Output Current From a Single Lithium-Ion Cell
■ Minimal External Components
■ 1.5MHz Fixed Frequency Operation
■ Internal Loop Compensation for Fast Response <25μs Full Scale Output Slewing; COUT 4.7μF
■ Output Disconnect in Shutdown
■ 2.75V to 5.5V Input
■ <1μA Shutdown Current
■ Internal Soft-Start
■ Output Overvoltage Protection
■ Single Inductor, No Schottky Diodes Required
■ Small, Thermally Enhanced 8-Lead (3mm × 3mm) DFN Package

APPLICATIONS
■ WCDMA Applications–3G Handsets with High Speed Data Rate Capability
■ MP3 Players
■ Digital Cameras