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Step-down controller with 'excellent' line, load regulation

Posted: 07 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt3800? step-down controller? controller?

Linear Technology Corp. unveiled a current mode, high voltage step-down controller that promises to provide excellent line and load regulation, along with fast transient response that operates without requiring an auxiliary dc-dc regulator for startup. The integrated regulator provides IC power directly from input supply.

The LT3800 controller operates from 4V to 60V supplies and regulates output voltages ranging from 1.23V to 36V at load currents up to 10A. By driving N-channel MOSFETs synchronously with maximum gate-source "ON" voltage, this controller operates at 94 percent efficiency while converting 60V input to 12V at 36W output. Moreover, the LT3800 incorporates Burst Mode operation, which reduces no load quiescent current to less than 100?A, a feature required in automotive maintenance power supplies.

This new product from Linear Tech operates at a 200kHz fixed frequency. It employs a reverse-current inhibit feature to increase efficiency during light loads. This feature also disables the synchronous switch if inductor current approaches zero. Another feature of the LT3800 is its adaptive nonoverlap control, which maintains a constant dead time, preventing shoot-through switch currents, independent of the type, size or operating conditions of the external MOSFET switches.

Targeted at applications in 12V and 42V automotive, 48V telecom supplies, avionic and industrial control systems, the LT3800 is offered in a 16-pin thermally enhanced TSSOP and is rated for operation from -40C to 125C. For 1,000-piece orders, pricing starts at $3.10.

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