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3-A output, 2-MHz buck-boost DC/DC converter offers extended run time from batteries or supercapacitors

December 15, 2010 | Paul Buckley | 222901950
3-A output, 2-MHz buck-boost DC/DC converter offers extended run time from batteries or supercapacitors Linear Technology is releasing a synchronous buck-boost converter that delivers 3 A of output current from a nominal 3.3V power source, Li-Ion/Polymer battery or up to 1 A from dual cell alkaline/NiCad/NiMH batteries. The LTC3113's 1.8 V to 5.5 V input range and 1.8 V to 5.5 V output range provides a regulated output from an input voltage above, below or equal to the output.

The LTC3113 is also an ideal regulator solution to maximize the energy available from a two supercapacitor stack. The proprietary buck-boost topology incorporated in the LTC3113 delivers a continuous transition through all operating modes, making it ideal for 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% more battery run time compared to a buck regulator.

The LTC3113's constant switching frequency is user programmable from 300 kHz up to 2 MHz in order to optimize the balance between efficiency and external component size. The combination of tiny externals and a 4 mm x 5 mm 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 29 mOhm and 40 mOhm, respectively) to deliver efficiencies of up to 96%. User-selectable Burst Mode operation lowers quiescent current to only 40 uA, 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.

Availability and Pricing

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 $3.95 each and $4.15 each, respectively for 1,000 piece quantities.

 Industrial grade versions, the LTC3113IDHD and LTC3113IFE, are guaranteed to operate over the -40 to 125 degrees C operating junction temperature range and are priced at $4.35 each and $4.57 each, respectively in 1,000-piece quantities. All versions are available from stock.

More information about the LTC3113 synchronous buck-boost converter at

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