LINEAR TECHNOLOGY ADDS SINGLE-INDUCTOR, HIGH-POWER BUCK-BOOST DC/DC CONTROLLER

May 1, 2005
The LTC3780 from Linear Technology Corporation is a high-performance buck-boost switching regulator controller, suited for automotive applications, which operate from input voltages above, below or equal to the output voltage. It offers three operating ...

The LTC3780 from Linear Technology Corporation is a high-performance buck-boost switching regulator controller, suited for automotive applications, which operate from input voltages above, below or equal to the output voltage. It offers three operating modes — constant frequency, burst mode and discontinuous current.

With a single inductor, the LTC3780 can deliver output power as high as 75 W, and four-switch synchronous rectification delivers efficiencies up to 97%. The constant frequency current mode architecture allows a phase-lockable frequency of up to 400 kHz. The controller's input range is 4 V to 30 V (36 V max). Its output range is 0.8 V to 30 V.

The device uses a proprietary current control architecture for constant frequency operation in buck or boost mode. Fault protection is provided for overvoltage, overcurrent and short-circuit conditions in all operating modes. A power good output open-drain pin signals whether the output voltage is in or out of regulation.
Linear Technology • (408) 432-1900www.linear-tech.com

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