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Buck-boost converter maintains low noise output

Posted: 21 Dec 2010     Print Version  Bookmark and Share

Keywords:buck-boost converter  Li-Ion battery  NiMH  NiCad 

Linear Technology debuts the LTC3113, a synchronous buck-boost converter that delivers 3A of output current from a nominal 3.3V power source, Li-Ion/Polymer battery or up to 1A from dual cell alkaline/NiCad/NiMH batteries.

 LTC3113

The LTC3113's 1.8V to 5.5V input range and 1.8V to 5.5V output range provides a regulated output from an input voltage above, below or equal to the output.

The LTC3113 also offers a regulator solution to maximise the energy available from a two supercapacitor stack. The proprietary buck-boost topology incorporated in the LTC3113 provides a continuous transition through all operating modes, targeting demanding applications that must maintain a constant, low noise output voltage even as the input voltage declines below the output. In many cases, this can add up to 25 per cent more battery run time compared to a buck regulator.

The LTC3113's constant switching frequency is user programmable from 300kHz up to 2MHz in order to optimise the balance between efficiency and external component size. The combination of tiny externals and a 4mm x 5mm DFN or TSSOP-20E package provides unprecedented power density, typically required in many high performance applications.

The LTC3113 includes two N-channel MOSFETs and two P-channel MOSFETs (RDS(ON) of 29mΩ and 40mΩ, respectively) to deliver efficiencies of up to 96 per cent.

User-selectable Burst Mode operation lowers quiescent current to only 40µA, improving light load efficiency and further extending battery run time. For noise sensitive applications, the Burst Mode operation can be disabled, offering the lowest noise operation. Other features include soft-start, current limiting, thermal shutdown and output disconnect.

LTC3113EDHD is available in a 16-lead 4mm x 5mm DFN package and the LTC3113EFE is in a thermally enhanced 20-lead TSSOP package. Pricing starts at Rs.176.45 ($3.95) each and Rs.185.38 ($4.15) each, respectively for 1,000 piece quantities.

Industrial grade versions, the LTC3113IDHD and LTC3113IFE, offering operations over the -40 to 125°C operating junction temperature range are priced at Rs.194.32 ($4.35) each and Rs.204.14 ($4.57) each, respectively in 1,000-piece quantities. All versions are available from stock.

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