High Power PolyPhase Synchronous Boost Controller
Linear Technology Corporation announces the H- and MP-grade versions of the LTC3787. This high power two-phase single output synchronous step-up DC/DC controller replaces the boost diodes with high efficiency N-channel MOSFETs, eliminating the heat sink typically required in medium to high power boost converters. The LTC3787 can produce a 24V at 10A output from a 12V input at up to 97% efficiency. Its 135µA standby quiescent current, when configured for Burst Mode® operation, makes it ideal for automotive, industrial and medical applications. These H- and MP-grade versions are guaranteed over operating junction temperature ranges of -40°C to 150°C and -55°C to 150°C, respectively.
The LTC3787 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. The powerful 1.2Ohm onboard N-channel MOSFET gate drivers are capable of slewing large MOSFET gates quickly. The device’s current-mode architecture, clock output and phase modulation enable easy paralleling of multiple devices for up to 12-phase operation. The LTC3787 has a phase-lockable frequency from 75kHz to 850kHz or a selectable fixed frequency from 50kHz to 900kHz.
The LTC3787 is available in SSOP-28 and 4mm x 5mm QFN-28 packages. The 1000-piece price starts at $4.88 each for the H-grade devices and $12.39 each for the MP-grade parts. For more information, visit www.linear.com/product/LTC3787.
Posted by Janine E. Mooney, Editor
May 23, 2012