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4% Accurate Programmable Average Input Current Limit Buck-Boost DC/DC Converter for High Peak Power Applications

21st February 2010

Linear Technology (UK) Limited

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Datasheet

Linear Technology announced the LTC3127, a 96% efficient, synchronous buck-boost converter that delivers up to 1A of output current to a regulated output voltage with inputs above, below or equal to the output. The LTC3127 features a ±4% accurate programmable average input current limit with a 200mA to 1000mA range, making it ideal for GSM modems or Supercapacitor chargers powered from sources with hard limits on output current. This enables system designers to maximize the current draw from a limited power source, significantly improving data rates or charging times.

The LTC3127's input range of 1.8V to 5.5V and output range of 1.8V to 5.25V is compatible with all types of PC card slots, USB and single-cell Li-Ion or dual/triple-cell alkaline/NiCd/NiMH applications. The LTC3127's current mode Buck-Boost topology provides a continuous transfer mode through all operating modes a simplifying design, and ensuring excellent performance. The LTC3127's constant 1.35MHz switching frequency offers low noise operation while minimizing the size of the few required external components. The combination of tiny externals and a 3mm x 3mm DFN or MSOP-12 package provides a highly compact solution footprint for space-limited applications.

The LTC3127 includes two N-channel MOSFETs (140mOhm and 160mOhm, respectively) and two P-channel MOSFETs (160mOhm and 190mOhm, respectively) to deliver efficiencies of up to 96%. The device's selectable Burst Mode® operation requires only 35µA of quiescent current and shutdown current is less than 1µA, further extending battery run time. For applications requiring the lowest possible noise, the LTC3127 can be configured to run in fixed frequency PWM mode, reducing noise and potential RF interference. Other features include thermal overload protection and output disconnect.

The LTC3127EDD is available from stock in a 10-lead DFN package and the LTC3127EMSE is available in a 12-lead