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Thomas Alva Edison (1847-1931) was one of the most well known inventors of all time with 1093 patents. During the whole of his life, Edison received only three months of formal schooling, and was dismissed from school as being retarded.

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1Linear Technology has announced a synchronous buck-boost converter that will convert any voltage between 2.7 and 40V to any voltage over the same range.

Outputs up to 2A are available.

Called LTC3115-1, the device includes the four necessary power mosfets, and can be programmed to operate anywhere from 100kHz to 2MHz.


"Proprietary third-generation buck-boost PWM circuitry ensures low noise and high efficiency while minimising the size of external components," claimed the firm. "There is a continuous, jitter-free transition between buck and boost modes."

Frequency compensation can be applied externally - a Linear Tech speciality - and the firm has included in the data sheet an extensive section on high-performance compensation schemes that is worth a read in its own right.

Schemes from one capacitor to five passives are discussed.

Burst-mode cuts quiescent current to 50µA at light load, and this can be disabled to keep noise low.

Shutdown current is 3µA, and efficiency peaks at 95%.

Additional features include internal soft-start, programmable under voltage protection, short circuit protection and output disconnect.

There are two packages: a 16-lead 4x5mm DFN, and a thermally-enhanced 20 lead TSSOP.

Data sheet is a text book on loop compensation