LINEAR Technology has announced the LTC3892 high voltage dual output synchronous step-down DC/DC controller with extremely low power draws.
The LTC3892 draws only 29µA when one output is active and 34µA when both outputs are enabled. The 4.5V to 60V input supply range is designed to protect against high voltage transients, ensuring continuous operation during automotive cold crank and to accommodate a broad range of input sources and battery chemistries.
Each output can be set from 0.8V to 99 percent of VIN at output currents over 20 amps with efficiencies as high as 96 percent, making it well suited for 12V or 24V automotive, heavy equipment, industrial control, robotics and telecom applications.
The LTC3892/-1’s adjustable 5V to 10V gate drivers enable the use of logic- or standard-level MOSFETs to maximise efficiency. It operates with a selectable fixed frequency between 50kHz and 900kHz, and can be synchronised to an external clock from 75kHz to 850kHz.
The user can select from continuous operation, pulse-skipping and low ripple Burst Mode operation during light loads. The controller’s 2-phase operation reduces input filtering and capacitance requirements. Its current mode architecture provides easy loop compensation, fast transient response, fixed frequency operation, excellent line regulation and easy current sharing with paralleled phases for higher current.
This device 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.