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15VIN, 2.5A Synchronous Buck-Boost DC/DC Converter Features Integrated Power MOSFETs, 95% Efficiency & Low Noise Operation

17th November 2010

Linear Technology (UK) Limited

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Datasheet

Linear Technology announces the LTC3112, a synchronous buck-boost converter that delivers up to 2.5A of output current from a wide range of power sources, including single or multiple cell batteries, super capacitor stacks and wall adapters. Its 2.7V to 15V input range and 2.5V to 14V output range provides a regulated output with inputs above, below or equal to the regulated output. The low noise buck-boost topology incorporated in the LTC3112 provides a continuous, jitter-free transition between buck and boost modes, making it ideal for RF and other noise-sensitive applications that must maintain a low-noise constant output voltage with a variable input power source.

In many applications, battery run time is significantly extended over step-down only solutions. The LTC3112's default 750kHz switching frequency, that can be synchronized to an external
300KHz to 1.5MHz clock, and proprietary third generation buck-boost PWM circuitry ensure low noise and high efficiency while minimizing the size of external components. The combination of tiny externals and a 4mm x 5mm DFN or TSSOP-20E package provides a compact solution footprint.

The LTC3112 includes four internal low RDS(ON) N-channel MOSFETs to deliver efficiencies of up to 95%. User-selectable Burst Mode® operation lowers quiescent current to only 50µA, improving light load efficiency and extending battery run time. For noise-sensitive applications, Burst Mode operation can be disabled. The LTC3112 also offers an integrated output current monitor that enables the load current to be monitored or controlled to a constant value. Other features include soft-start, overvoltage protection, short circuit protection, thermal shutdown and output disconnect.

LTC3112EDHD is available in a 16-lead 4mm x 5mm DFN package and the LTC3112EFE is available in a thermally enhanced 20-lead TSSOP package.