LTC3443 Datasheet | Linear Technology

High Current Micropower 600k Hz Synchronous Buck-Boost DC/DC Converter Features - Regulated Output with Input Above, Below or Equal to the Output - Single Inductor, No Schottky Diodes - High Efficiency: Up to 96% - 28μA Quiescent Current in Burst Mode® Operation - Up to 1.2A Continuous Output Current from a Single Lithium-Ion - True Output Disconnect in Shutdown - 2.4V to 5.5V Input Range - 2.4V to 5.25V Output Range - 600k Hz Fixed Frequency Operation - Synchronizable Oscillator - Selectable Burst Mode or Fixed Frequency Operation - <1μA Quiescent Current in Shutdown - Small, Thermally Enhanced 12-Lead (4mm × 3mm × 0.8mm) DFN package U APPLICATIO S - Handheld puters - Handheld Instruments - MP3 Players - Digital Cameras , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Burst Mode is a registered trademark of Linear Technology Corporation. U.S. Patent #’s 6404251, 6166527 DESCRIPTIO The LTC®3443 is a high efficiency, fixed frequency, buckboost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The part is pin for pin patible with its predecessor, the LTC3441, with a lower operating frequency (600k Hz), and a VC pin clamp circuit during Burst Mode operation. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single Lithium Ion or multicell applications where the output voltage is within the battery voltage range. The device includes two 0.10Ω N-channel MOSFET switches and two 0.11Ω P-channel switches. External Schottky diodes are optional, and can be used for a moderate efficiency improvement. The operating frequency is internally set to 600k Hz and can be synchronized up to 1.2MHz. Quiescent current is only 28μA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and...