High Power PolyPhase® Synchronous Boost Controller Features -55°C to 150°C Operating Junction Temperature Range



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60V PolyPhase® Synchronous Step-Up
DC/DC Controller

Linear Technology 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. Summary of Features: LTC3787

  • Up to 97% Efficiency
  • Eliminates Heat Sink in Medium to High Power Boost Converters
  • Up to 60V VOUT Operation
  • Wide VIN Ranging from 4.5V to 38V, Maintains Operation down to 2.5V after Start-Up
  • Low 135μA Quiescent Current
  • Powerful 1.2 Ohm Gate Drivers
  • 100% Duty Cycle Capability for Synchronous MOSFET
  • Phase Lockable Frequency from 75kHz to 850kHz
  • Programmable Fixed Frequency from 50kHz to 900kHz
  • Current-Mode Control
  • Phase Modulation for up to 12 Phases
  • Power Good Output