LTC3440EDD#PBF Datasheet PDF - Linear Technology

●The LTC3440EDD#PBF is a high-efficiency fixed frequency buck-boost DC-to-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

● No Schottky diodes required (VOUT<4.3V)

● VOUT disconnected from VIN during shutdown

● Synchronizable oscillator

● Burst Mode® enable control

● Synchronous rectification - Up to 96% efficiency

● <1µA Shutdown current