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Buck-boost converter voltage range suits all PC card slots

Posted: 24 Feb 2010     Print Version  Bookmark and Share

Keywords:buck-boost converter  supercapacitor  GSM modem 

From Linear Technology Corp. comes LTC3127 that features a ±4 per cent accurate programmable average input current limit with a 200mA to 1000mA range, making it suitable for GSM modems or supercapacitor chargers powered from sources with hard limits on output current. With 96 per cent efficiency, the synchronous buck-boost converter delivers up to 1A of output current to a regulated output voltage with inputs above, below or equal to the output.

This enables system designers to maximise 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 minimising 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 (140mΩ and 160mΩ, respectively) and two p-channel MOSFETs (160mΩ and 190mΩ, respectively) to deliver efficiencies of up to 96 per cent. 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 thermally enhanced MSOP package. Pricing is Rs.136.22 ($2.95) and Rs.138.53 ($3) respectively, each, for 1,000-piece quantities.

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