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DC/DC converters boast 2.7-40V input

Posted: 24 Nov 2011 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? buck-boost topology? low noise?

Linear Technology Corp. has unveiled a synchronous buck-boost converter that offers up to 2A of continuous output current from a range of power sources. These include single-cell Li-ion, 24V/28V industrial rails and 40V automotive inputs. The LTC3115-1 features 2.7-40V input and output range that provides a regulated output with inputs above, below or equal to the regulated output, stated Linear Tech.

The low noise buck-boost topology incorporated in the LTC3115-1 delivers a continuous, jitter-free transition between buck and boost modes. The company said this makes 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.


LTC3115-1 gives a continuous, jitter-free transition between buck and boost modes.

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 4 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 up to 95 percent. User-selectable burst mode operation lowers quiescent current to only 50?A, 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 4 x 5mm DFN package and the LTC3115EFE-1 in a thermally enhanced 20-lead TSSOP package. Pricing starts at $5.35 and $5.55 each, respectively, for 1,000 piece quantities. Industrial grade versions, the LTC3115IDHD-1 and LTC3115IFE-1, are guaranteed to operate in the -40C to 125C operating junction temperature range and are priced at $5.89 and $6.11 each, respectively, in 1,000-piece quantities. All versions are available from stock.

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