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Send til en ven   Udskriv26/11 2010 kl. 11:59
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DC/DC med integreret power MOSFETs

Linear Technology introducerer unik 15VIN, 2.5A synkron buck-boost DC/DC konverter med integrerede power MOSFETs og 95% effektivitet (in english). 

Linear Technology announces the LTC3112, a synchronous buck-boost converter that 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 provides 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, making it ideal for RF and other noise-sensitive applications that must maintain a low-noise constant output voltage with a variable input power source.


In many applications, battery run time is significantly extended over step-down only solutions. The LTC3112's default 750kHz switching frequency, that can be synchronized to an external 300KHz to 1.5MHz clock, and proprietary third generation buck-boost PWM circuitry ensure low noise and high efficiency while minimizing the size of external components. The combination of tiny externals and a 4mm 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%. User-selectable Burst Mode operation lowers quiescent current to only 50µA, improving light load efficiency and extending battery run time. 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.

LTC3112EDHD is available in a 16-lead 4mm x 5mm DFN package and the LTC3112EFE is available in a thermally enhanced 20-lead TSSOP package. Industrial grade versions, the LTC3112IDHD and LTC3112IFE, are guaranteed to operate over the -40°C to 125°C operating junction temperature range.
www.linear.com/3112.

 

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