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, operating over a 3.5V to 60V input supply range, 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. This device helps increase the run-time in battery-powered applications with its low 70µA 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 suited to 12V or 24V automotive, heavy equipment, industrial control, robotic and telecom applications.
The LTC3863 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 good line regulation. Output current sensing is accomplished by measuring the voltage drop across a sense resistor. Additional features include programmable soft start or tracking, overvoltage protection, overcurrent and short-circuit protection, a power good output signal and FMEA (failure mode and effects analysis) verified for adjacent pin opens and shorts. It occupies a 12-pin thermally enhanced MSOP or 3 x 4mm QFN package. LTC3863E and LTC3863I versions operate from a -40°C to 125°C junction temperature. LTC3863H grade is guaranteed to operate from a -40°C to 150°C operating junction temperature. LTC3863MP is guaranteed to operate from a -55°C to 150°C operating junction temperature. Pricing is from $2.06 (1,000). More; www.linear.com/product/LTC3863.