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Single Inductor High Efficiency Synchronous Buck-Boost DC/DC Controller
MILPITAS, CA - December 13, 2010 - Linear Technology Corporation
announces the LTC3789, a very
high efficiency (up to 98%) synchronous buck-boost DC/DC controller
that operates from input voltages above, below or equal to the
regulated output voltage. High power circuits that step-up and-down
typically rely on transformers or two DC/DC converters, one for
step-up (boost) and the other for step-down (buck) conversion. The
LTC3789 operates using a single inductor with 4-switch synchronous
rectification and can deliver output power up to 150W with a single
device. Even higher output power can be achieved when multiple
circuits are paralleled.
The LTC3789 operates with a selectable fixed frequency between
200kHz and 600kHz, and can be synchronized to an external clock
over the same range with its integrated phase-locked loop (PLL).
Its wide 4V to 38V input range, 0.8V to 38V output range and
seamless transitions between operating modes make it ideal for a
wide range of industrial controls, automotive, solar and high power
battery-supplied systems.
The LTC3789 employs a proprietary current-mode control architecture
for constant frequency operation in buck or boost mode and has
powerful onboard quad N-channel MOSFET gate drivers. The LTC3789
also provides an accurate, constant-current regulation loop for
either input or output current, over a wide input voltage range.
The input current limit function prevents overloading of the input
source, and the output current limit provides an easy solution for
regulated output current applications such as battery charger or
LED drivers. Fault protection is provided for overvoltage,
overcurrent and short circuit conditions in all operating modes. In
addition, the LTC3789 disconnects the input voltage from the output
when in shutdown. The user can select continuous or pulse skip mode
to maximize light load efficiency. Furthermore, the LTC3789 has
adjustable soft-start, a power good output and maintains ±1.5%
reference voltage accuracy over an operating junction temperature
range of -40°C to 125°C.
The LTC3789 is available in 28-pin 4mm x 5mm QFN and 28-lead SSOP
packages. Pricing starts at $4.65 each in 1,000-piece quantities.
For more information, visit www.linear.com/3789.
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Summary of Features: LTC3789
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38V Synchronous Buck-Boost Controller |
