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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 0.10 N-channel MOSFET switches and two 0.11 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 25A 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 1A shutdown, soft-start control,thermal shutdown and current limit. The LTC3441 is available in a thermally enhanced 12-lead (4mm * 3mm) DFN package.
LTC3441 Maximum Ratings
VIN, VOUT Voltage........................................ 0.3V to 6V SW1, SW2 Voltage DC ...............................................................0.3V to 6V Pulsed < 100ns .......................................... 0.3V to 7V SHDN/SS, MODE/SYNC Voltage ................... 0.3V to 6V Operating Temperature Range (Note 2) 40°C to 85°C Maximum Junction Temperature (Note 4) ............. 125°C Storage Temperature Range ............. 65°C to 125°C
LTC3441 Features
` Regulated Output with Input Above, Below or Equal to the Output ` Single Inductor, No Schottky Diodes ` High Efficiency: Up to 95% ` 25A 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 ` 1MHz Fixed Frequency Operation ` Synchronizable Oscillator ` Selectable Burst Mode or Fixed Frequency Operation ` <1A Quiescent Current in Shutdown ` Small, Thermally Enhanced 12-Lead (4mm * 3mm) DFN package