Linear
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.
The LTC3872
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.
Summary
of Features:
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
Current-mode control
Thermally enhanced 2 x 3 mm DFN-8 and ThinSOT packages
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