Buck-boost controller

Linear Technology has announced a high reliability (MP) grade version of the LTC3780, a high-efficiency synchronous buck-boost switching regulator DC/DC controller that operates from input voltages above, below or equal to the output voltage.

The device operates using a single inductor and can deliver output up to 150 W. Higher power can be achieved when multiple circuits are paralleled. With four-switch synchronous rectification, it can deliver efficiencies up to 98%.

The controller operates with a selectable fixed frequency between 200 and 400 kHz and can be synchronised to an external clock over the same range with its phased-locked loop. Its 4 to 36 V input range, 0.8 to 30 V output range and transitions between operating modes make it suitable for military, motor vehicle and battery-powered systems.

The device employs a proprietary current control architecture for constant frequency operation in buck or boost mode and has onboard MOSFET gate drivers. Fault protection is provided for overvoltage, overcurrent and short-circuit conditions in all operating modes.

The output voltage turn-on time can be adjusted with the device’s programmable soft-start.