LTC3441 Datasheet | Linear Technology

Features nn Regulated Output with Input Above, Below or Equal to the Output nn Single Inductor, No Schottky Diodes nn High Efficiency: Up to 95% nn 25µA Quiescent Current in Burst Mode® Operation nn Up to 1.2A Continuous Output Current from a Single Lithium-Ion nn True Output Disconnect in Shutdown nn 2.4V to 5.5V Input Range nn 2.4V to 5.25V Output Range nn 1MHz Fixed Frequency Operation nn Synchronizable Oscillator nn Selectable Burst Mode or Fixed Frequency Operation nn <1µA Quiescent Current in Shutdown nn Small, Thermally Enhanced 12-Lead (4mm × 3mm) DFN package Applications nn Handheld puters nn Handheld Instruments nn MP3 Players nn Digital Cameras L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks and Thin SOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. High Current Micropower Synchronous Buck-Boost DC/DC Converter Description The LTC®3441 is a high efficiency, fixed frequency, buckboost DC/DC converter that operates efficiently from input voltages above, below or 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 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 1MHz and can be synchronized up to 1.7MHz. Quiescent current is only 25µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/SYNC pin is driven low or with a clock, then fixed frequency switching is enabled. Other Features include a 1µA shutdown, soft-start...