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Send til en ven   Udskriv22/11 2011 kl. 11:11
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Unik buck-boost konverter kan levere 2A fra en bred vifte af spændingskilder

Linear Technology lancer 40Vin/Out, 2A synkron buck-boost DC/DC konverter, der kan operere med input- og outputspændingsområde fra 2,7V til 40V (in english). 

Modern automotive, industrial and commercial applications continue to require increasingly complex electronic systems. The power requirements for these systems continue to grow while the available space for power conversion solutions continually shrinks. Furthermore, electrical performance criteria of these power ICs becomes more demanding.

For example, some automotive applications require a well regulated output voltage, even when the input voltage dips below the output in a cold crank scenario, or when it increases substantially above the output, such as in a load dump scenario. 


Similarly, high efficiency is of paramount importance as it minimizes thermal design considerations while also maximizing battery run time. High switching frequencies are also required to keep switching noise out of noise sensitive frequency bands such as AM radio bands and to keep externals components as small as possible, minimizing the solution footprint.  Additionally, in many always-on applications, low quiescent current is required to maximize battery run time since this minimizes the power drawn from the battery when the IC is in standby mode.

Linear Technology announces the LTC3115-1, a synchronous buck-boost converter that delivers up to 2A of continuous output current from a wide range of power sources from single-cell Li-Ion to 24V/28V industrial rails to 40V automotive inputs.  The LTC3115-1’s 2.7V to 40V input and 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 LTC3115-1 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 LTC3115-1’s switching frequency is user programmable between 100kHz and 2MHz, and can be synchronized to an external clock. Proprietary third generation buck-boost PWM circuitry ensures 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 LTC3115-1 incorporates 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. Additional features include internal soft-start, programmable undervoltage protection, short circuit protection and output disconnect.

LTC3115EDHD-1 is available in a 16-lead 4mm x 5mm DFN package and the LTC3115EFE-1 is available in a thermally enhanced 20-lead TSSOP package.
www.linear.com/product/LTC3115-1

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