Synchronous boost controller operates at 150C with up to 98% efficiency
Linear Technology have announced the H-grade versions of the LTC3786, a synchronous step-up DC-DC controller with guaranteed operation for junction temperatures up to 150C. The device replaces the boost diode with an N-channel MOSFET for higher efficiency and reduced power loss. This controller can produce 24V at 5A output from a 12V input with up to 98% efficiency, ideal for automotive, industrial, and medical applications.
The device operates from an input voltage ranging from 4.5V to 38V during start-up, maintains operation down to 2.5V after start-up and can regulate an output voltage as high as 60V. Its low 55µA quiescent current helps extend the run time in battery powered applications when in standby mode. The powerful 1.2ohm onboard N-channel MOSFET gate drivers are capable of slewing large MOSFET gates quickly, minimizing transition losses and allowing for up to a 10A output current. It has adjustable cycle-by-cycle current limit protection and uses either a sense resistor or monitors the voltage drop across the inductor (DCR) for current sensing.
In applications where the input voltage may exceed the regulated output voltage, the device is able to keep the synchronous MOSFET on continuously so that the output voltage follows the input voltage with minimal power loss. It has a phase-lockable frequency from 75kHz to 850kHz or a selectable fixed frequency from 50kHz to 900kHz.