DESCRIPTION

The LTC®3442 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 multicell alkaline applications where the output voltage is within the battery voltage range.

FEATURES

■ Regulated Output with Input Voltages Above, Below, or Equal to the Output

■ Single Inductor, No Schottky Diodes Required

■ Manual or Programmable Automatic Burst Mode® Operation

■ Programmable Average Input Current Limit

■ Up to 1.2A Continuous Output Current from a Single Lithium-Ion Cell

■ High Efficiency: Up to 95

■ Output Disconnect in Shutdown

■ 2.4V to 5.5V Input Range

■ 2.4V to 5.25V Output Range

■ 35µA Quiescent Current in Burst Mode Operation

■ Programmable Frequency from 300kHz to 2MHz

■ <1µA Shutdown Current

■ Small, Thermally Enhanced 12-Lead (4mm × 3mm) DFN Package

APPLICATIONS

■ PDA/‘SMART’ Phones

■ Handheld Computers

■ MP3 Players

■ Handheld Instruments

■ Digital Cameras

■ Wireless Handsets

■ USB Peripherals