Dual output controller draws only 29µA in standby

Each output can be set from 0.8V to 99% of VIN at output currents over 20A with efficiencies as high as 96%, making the device well suited for 12V or 24V automotive, heavy equipment, industrial control, robotics and telecomms applications.

The controller’s adjustable 5-10V gate drivers enable the use of logic- or standard-level MOSFETs to maximise efficiency. It operates with a selectable fixed frequency between 50 and 900kHz, and can be synchronised to an external clock from 75 to 850kHz. The user can select from continuous operation, pulse-skipping and low ripple Burst Mode operation during light loads. The device’s two-phase operation reduces input filtering and capacitance requirements. Its current mode architecture provides easy loop compensation, fast transient response, fixed frequency operation, outstanding line regulation and easy current sharing with parallelled phases for higher current. Output current sensing is accomplished by measuring the voltage drop across the output inductor for the highest efficiency or by using an optional sense resistor for high accuracy. Current foldback limits MOSFET heat dissipation during overload conditions. The controller is available in two versions; the LTC3892 being the full-featured part with two power good signals, adjustable current limit and fixed 3.3V or 5V output voltage options.

The LTC3892 is available in a 32-lead 5x5mm QFN package and the LTC3892-1 is available in a 28-lead TSSOP package. Four temperature grades are available, with operation from -40 to +125°C for the extended and industrial grades, -40 to +150°C for the automotive grade and -55 to +150°C for the military grade. The 1,000-piece price starts at $4.82 each.