LTC3442

LTC3442 FEATURES Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation DESCRIPTION n Regulated Output with Input Voltages Above, Below, or Equal to the Output n Single Inductor, No Schottky Diodes Required n Manual or Programmable Automatic Burst Mode® Operation n Programmable Average Input Current Limit n Up to 1.2A Continuous Output Current from a Single Lithium-Ion Cell n High Efficiency: Up to 95% n Output Disconnect in Shutdown n 2.4V to 5.5V Input Range n 2.4V to 5.25V Output Range n 35µA Quiescent Current in Burst Mode Operation n Programmable Frequency from 300kHz to 2MHz n <1µA Shutdown Current n Small, Thermally Enhanced 12-Lead (4mm × 3mm) DFN Package APPLICATIONS n PDA/‘SMART’ Phones n Handheld Computers n MP3 Players n Handheld Instruments n Digital Cameras n Wireless Handsets n USB Peripherals 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. The device includes two 0.10Ω N-channel MOSFET switches and two 0.10Ω P-channel switches. Operating frequency and average input current limit can each be programmed with an external resistor. Quiescent current is only 35µA in Burst...