Technology Corp.'s H-grade version of the LTC3872 has a small footprint 550kHz fixed frequency step-up dc/dc controller
that is specified over a -40
to150C junction temperature range. The LTC3872 accepts a 2.5 to 9.8V input
voltage range and can produce an output voltage as
high as 60V without needing a sense resistor. Capable of driving large
N-channel MOSFETs, the LTC3872 can produce high peak output currents. When
powered with a 5V bias voltage, the switch can go
up to 60V, making it well suited
for automotive, heavy equipment and industrial control applications.
current-mode architecture provides cycle-by-cycle current limiting and
transient response. Pulse skipping operation at light loads reduces the
quiescent current to 250uA which helps extend the run-time in the battery-powered
applications during standby mode. Additional features include an internal
soft start, adjustable current limit, precision undervoltage lockout and tight
±1.6 percent reference voltage accuracy over the full -40 to 150C operating
temperature range. The LTC3872H is offered in a
thermally enhanced 2mm x 3mm DFN-8 package and 8-lead ThinSOTTM package. 1,000-piece
pricing starts at $2.35 each.
VOUT up to 60V without sense resistor
VIN Range: 2.75 to 9.8V
Constant frequency 550kHz operation
Adjustable current limit
Pulse skipping at light load
Internal soft-start and optional external soft-start
±1.6 percent reference voltage accuracy
Thermally enhanced 2 x 3 mm DFN-8 and ThinSOT packages
A bold, gold, open-air coupe may not be the ticket to automotive nirvana for every consumer, but Lexus’ LF-C2 concept car certainly turned heads at the recent Los Angeles Auto Show. What’s more, it may provide a glimpse of the luxury automaker’s future.
The complexity of diesel engines means optimizing their performance requires a large amount of experimentation. Computational fluid dynamics (CFD) is a very useful and intuitive tool in this, and cold flow analysis using CFD is an ideal approach to study the flow characteristics without going into the details of chemical reactions occurring during the combustion.
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