Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3785
Edited by the Electronicstalk Editorial
Team on 30 January 2008
Regulator goes up or down with only an
inductor
Operating with four-switch synchronous rectification, the LTC3785 provides seamless transitions between the buck and boost operating modes.
Linear Technology has introduced the LTC3785, a 96% efficient buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage for powering tablet PCs, handheld instruments, wireless modems, portable media players and a wide variety of single- or dual-cell Li-ion or multicell alkaline/NiMH powered devices Medium-power buck-boost circuits have traditionally relied on transformers (SEPIC) or two cascaded DC/DC convertors, one for the step-up (boost) and one for the step-down (buck) conversion
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3785 requires only a single inductor from an input range of 2.7 to 10V, offers an identical output range, and can deliver up to 50W of output power.
Operating with four-switch synchronous rectification, the LTC3785 provides seamless transitions between the buck and boost operating modes.
The LTC3785's proprietary topology and control architecture employs MOSFET on-resistance sensing for forward and reverse current limiting, yielding unrivalled efficiency.
A sense resistor may be used when increased accuracy is desired.
Moreover, the LTC3785 incorporates Burst Mode operation which reduces light load quiescent current to less than 100uA, a valuable feature in battery powered systems.
In addition, fault protection is provided for overvoltage, overcurrent and short-circuit conditions in all operating modes.
The operating frequency can be programmed from 100kHz to 1MHz with a single resistor and the LTC3785 also incorporates true output disconnect during shutdown.
The LTC3785 is offered in a 4 x 4mm QFN-24 package.
The 1000-piece price is US $3.56 each. Request a free brochure from Linear Technology Corp ...
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