The LTC3440EMS#PBF is a micropower synchronous buck-boost DC/DC Converter operates 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, multicell alkaline or NiMH applications where the output voltage is within the battery voltage range. The device includes two 0.19R N-channel MOSFET switches and two 0.22R P-channel switches. Switching frequencies up to 2MHz are programmed with an external resistor and the oscillator can be synchronized to an external clock. 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 has either a clock or is driven low, then fixed frequency switching is enabled.
- Single inductor
- Fixed frequency operation with battery voltages above, below or equal to the output
- Synchronous rectification up to 96% efficiency
- 25μA Quiescent current in Burst Mode? operation
- Up to 600mA continuous output current
- No Schottky diodes required (VOUT < 4.3V)
- VOUT disconnected from VIN during shutdown
- Programmable oscillator frequency from 300kHz to 2MHz
- Synchronizable oscillator
- Burst Mode? enable control
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