The New Adjustable Output Non-synchronous Boost Controller

Published:2011/8/24 1:41:00 Author:Phyllis From:SeekIC

ON Semiconductor introduced a new adjustable output non-synchronous boost controller for automotive systems.

The NCV8871 is a wide input voltage device ranging from 3.2V to 44V, which can be used to drive an external N-channel MOSFET. There’s an internal regulator in the device that charges to the gate driver. When in sleep mode, this new boost controller has a 3.0μA quiescent, which minimizes the power consumption. It features a synchronizable switching frequency with two available versions of 170KHz or 1MHz.





Its internal slope compensation for the peak current mode control ensures device stability over the wide automotive battery range. This also protects the device from a current fault condition by turning off the power switch for the remainder of the cycle if the current limit is exceeded. Further protection is provided by a thermal shutdown mechanism and a 3.1V undervoltage lockout.

The NCV8871 is highly programmable with various frequency options include different slope compensation values, current limit set points and different gate drive voltages for interfacing with various MOSFETs. The device also supports multiple topology configurations, including boost, flyback, SEPIC, and multi-phase. Output power ranges from a few Watts up to 200 W in a boost topology.

The NCV8871 operates down to 3.2 V, whereas alternative controller solutions on the market typically only go down to 4 V, this makes the device highly optimized for engine start/stop applications. Its high level of integration brings other benefits too. Previously, the only option for engineers was to utilize more complex devices, which had higher pin counts and called for a larger number of external components. The NCV8871 simplifies the design process, reduces the bill of materials, and shortens the design time.

The NCV8871 has an operating junction temperature of 0 ℃ to 150 ℃. The device is offered in a Pb-free, RoHS compliant SOIC-8 package, and is priced at $0.83 per unit in quantities of 2,500 units.

About ON Semiconductor

ON Semiconductor is a premier supplier of high performance silicon solutions for energy efficient electronics. The company’s broad portfolio of power and signal management, logic, discrete and custom devices helps customers efficiently solve their design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power applications. ON Semiconductor operates a world-class, value-added supply chain and a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions.

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