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Linear's DC/DC controller runs only a single inductor

Posted: 03 Apr 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? DC/DC controller? inductor? MOSFET?

Linear Technology has recently introduced a high voltage inverting DC/DC controller that uses a single inductor to produce a negative voltage from a positive input voltage. The LTC3863 simplifies the design further with all of its interface signals being positive ground referenced. None of the LTC3863 pins are connected to a negative voltage, allowing the output voltage to be limited only by the selection of external components.

The LTC3863 is designed to protect against high voltage transients, to operate continuously during automotive cold crank and cover a broad range of input sources and battery chemistries. It operates over a 3.5V to 60V input supply range and helps increase the run-time in battery-powered applications with its low 70?A quiescent current in standby mode with the output enabled in Burst Mode operation. The LTC3863's output voltage can be set from -0.4V to -150V or lower at up to 3A typical; making it well suited for 12V or 24V automotive, heavy equipment, industrial control, robotic and telecom applications.

Linear's latest controller drives an external P-channel MOSFET, operates with a selectable fixed frequency between 50kHz and 850kHz and is synchronisable to an external clock from 75kHz to 750kHz. Its current-mode architecture provides easy loop compensation, fast transient response, cycle-by-cycle over current protection and excellent line regulation. Output current sensing is accomplished by measuring the voltage drop across a sense resistor. Additional features include programmable soft start or tracking, over-voltage protection, over-current and short-circuit protection, a power good output signal and FMEA (failure mode and effects analysis) verified for adjacent pin opens and shorts.

The LTC3863 is offered in 12-pin thermally enhanced MSOP and 3mm X 4mm QFN packages. The LTC3863E and LTC3863I versions operate from a -40C to 125C junction temperature. The LTC3863H grade is guaranteed to operate from a -40C to 150C operating junction temperature. The LTC3863MP is guaranteed to operate from a -55C to 150C operating junction temperature. The 1,000-piece price starts at $2.06 each.

Further information regarding Linear's LTC3863 DC/DC controller can be found here.





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