Linear Tech Introduces 15V, 2.5A Synchronous Buck-Boost DC-DC Converter
Linear Technology announced 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 2.7 to 15V input range and 2.5 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 well suited 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 4 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.
The LTC3112EDHD is available in a 16-lead 4 x 5mm DFN package and the LTC3112EFE is available in a thermally enhanced 20-lead TSSOP package. Pricing starts at $4.00 each and $4.15 each, respectively for 1,000 piece quantities. Industrial grade versions, the LTC3112IDHD and LTC3112IFE, are guaranteed to operate over the -40 to 125°C operating junction temperature range and are priced at $4.40 and $4.57 each, respectively, in 1,000-piece quantities.
