Synchronous dc/dc controller for industrial applications
Linear Technology’s LTC3895 is a non-isolated synchronous step-down switching regulator dc/dc controller. It drives an all N-channel Mosfet power stage and its 4 to 140V input voltage range is designed to operate from a high input voltage source or from an input that has high voltage surges, eliminating the need for external surge suppression devices. The LTC3895 is designed for transportation, industrial control, robotic and datacom applications.
The output voltage can be set from 0.8V to 60V at output currents up to 20 amps with efficiencies as high as 96%. This part draws only 40µA in sleep mode with the output voltage in regulation, ideal for always-on systems. An internal charge pump allows for 100% duty cycle operation in dropout, a useful feature when powered from a battery during discharge. The LTC3895 operates with a selectable fixed frequency between 50 and 900kHz and is synchronizable to an external clock from 75 to 850kHz. The user can select from forced continuous operation, pulse-skipping or burst mode operation during light loads. Additional features include a fixed 5 or 3.3V output option, integrated bootstrap diode, a power good output signal, adjustable input overvoltage lockout, and soft-start.
– Edited by CFE Media. See more Control Engineering energy and power products.