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Synchronous converter delivers up to 600mA

Posted: 18 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:power management? converter? Li-ion? Linear Technology? buck-boost converter?

Linear Technology has announced a synchronous buck-boost converter that delivers up to 600mA of output current to a regulated output voltage with inputs above, below or equal to the output.

The LTC3530's input range of 1.8-5.5V and output range of 1.8-5.25V are compatible with single cell Li-ion or dual-cell alkaline/NiCad/NiMH applications. The topology incorporated in the device provides continuous transfer through all operating modes, making it suitable for applications that must maintain a constant output voltage even as the battery voltage declines below the output. In many cases this can add up to 20 percent more battery run-time.

The LTC3530's constant switching frequency provides low noise and is user programmable from 300kHz up to 2MHz, allowing optimization between efficiency and solution size. The combination of compact externals and a 3-by-3mm DFN or MSOP-10 package provides a tiny solution footprint, usually required in handheld applications.

The LTC3530 includes two n-channel MOSFETs and two p-channel MOSFETs (0.21 ohm and 0.24 ohm, respectively) to deliver efficiencies of up to 96 percent. Programmable Burst Mode operation allows the user to adjust the load current at which Burst Mode initiates. Burst Mode operation requires only 40?A of quiescent current while shutdown current is less than 1?A, further extending battery run-time. Other features include soft-start, current limiting, thermal shutdown and output disconnect.

The LTC3530EDD is available from stock in a 10-lead DFN package and the LTC3530EMS is available in a 10-lead MSOP package. Pricing for both versions is $2.75 each for 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC3530 Wide Input Voltage Synchronous Buck-Boost DC/DC Converter ICs, Interface



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