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DC/DC controller integrates 1.1? MOSFET drivers

Posted: 16 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC controller? MOSFET? automotive?

From Linear Technology Corp. comes the LTC3890/-1 high-voltage, dual-output synchronous step-down DC/DC controller that draws only 50?A when one output is active and 60?A when both outputs are enabled.

With both outputs shut down, the LTC3890/-1 draws a mere 14?A. The 4V to 60V input supply range is designed to protect against high voltage transients, continue operation during automotive cold crank and cover a broad range of input sources and battery chemistries. Each output can be set from 0.8V to 24V at output currents up to 20A with efficiencies as high as 95 percent, making it well suited for 12V or 24V automotive, heavy equipment, industrial control, robotics and telecom applications.

The LTC3890/-1 has powerful 1.1? on-chip MOSFET gate drivers. It operates with a selectable fixed frequency between 50kHz and 900kHz, and can be synchronized to an external clock from 75kHz to 850kHz with its phased-locked loop. The user can select from continuous operation, pulse skipping and low ripple Burst Mode operation during light loads.

The LTC3890 is available in a 32-lead 5mm x 5mm QFN package and the LTC3890-1 is housed in a 28-pin SSOP package.

Pricing starts at $4.76 each in 1,000-piece quantities.

- eeProductCenter

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