Buck-Boost Converter Designed for RF Applications

Linear Technology has released the LTC3112, a synchronous buck-boost converter designed for RF and other noise-sensitive applications. The LTC3112 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 enable 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. In many applications, battery runtime is significantly extended over step-down-only solutions. The LTC3112's default 750kHz switching frequency, which can be synchronised to an external 300KHz to 1.5MHz clock, and proprietary third-generation buck-boost PWM circuitry ensure low noise and high efficiency while minimising the size of external components.

The combination of tiny externals and 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 per cent. User-selectable Burst Mode operation lowers quiescent current to only 50uA, improving light load efficiency and extending battery runtime. 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 USD4.00 (GBP2.43) each and USD4.15 each respectively for 1,000-piece quantities. Industrial-grade versions, the LTC3112IDHD and the LTC3112IFE, are guaranteed to operate over the -40C to +125C operating junction temperature range and are priced at USD4.40 and USD4.57 each respectively in 1,000-piece quantities.

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