The LTC3890/-1’s wide input voltage range of 4V to 60V protects against high voltage transients, continues operation during an automotive cold crank and covers a broad range of input sources and battery chemistries. It draws only 50µA when one output is active and 60µA when both outputs are enabled. Each output can be set from 0.8V to 24V at output currents up to 20A with efficiencies as high as 95%, making it well suited for 12V or 24V automotive, heavy equipment, industrial control, robotics and telecom applications. The LTC3890/-1’s minimum on-time of just 95ns makes it ideal for high step-down ratio applications. It has a powerful 1.1Ω on-chip MOSFET gate driver that minimizes switching losses. The LTC3890/-1 operates with a selectable fixed frequency between 50kHz and 900kHz, and can be synchronized to an external clock from 75kHz to 850kHz with its phased-lock loop (PLL). The user can select from continuous operation, pulse skipping and low ripple Burst Mode® operation during light loads. Output current sensing is accomplished by measuring the voltage drop across the output inductor (DCR) for the highest efficiency or by using an optional sense resistor. Current fold-back limits MOSFET heat dissipation during overload conditions. The device is available in two versions with the LTC3890 being the fully featured part with functions including a clock out, clock phase modulation, two separate power good outputs and an adjustable current limit.