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Step-Up DC/DC Controller: LTC3784

February 19, 2014
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LTC3784Linear Technology Corp. announces the LTC3784, a high power two phase single output synchronous step-up DC/DC controller that replaces rectifying boost diodes with high efficiency N-channel MOSFETs. This device can produce a 24 V output at 10 A from a 12 V input at up to 97% efficiency without any heat sink. The LTC3784 operates from an input voltage ranging from 4.5 V to 60 V during start-up, maintains operation down to 2.3 VIN after start-up and can regulate an output voltage as high as 60 V.

When configured for Burst Mode® operation, the LTC3784’s 28µA quiescent current makes it ideal for “Always-on” automotive applications to extend battery run-time during standby mode while keeping the output voltage in regulation. The powerful 1.2 Ohm onboard N-channel MOSFET gate drivers are capable of slewing large MOSFETs quickly. The device’s current mode architecture, clock output and phase modulation enable easy paralleling of multiple devices for up to 12-phase operation for very high power applications.

The LTC3784 has a phase-lockable switching frequency from 75kHz to 850kHz or a selectable fixed frequency from 50kHz to 900kHz. In addition, this device features adjustable cycle-by-cycle current limit and can use a sense resistor or the voltage drop across the inductor (DCR) for current sensing. In keep alive applications where the input voltage may exceed the regulated output voltage, the LTC3784 allows the synchronous MOSFET to be kept on continuously so that the output voltage follows the input voltage with minimal power loss. Furthermore, the LTC3784 has adjustable soft-start, a power good output and maintains ±1% reference voltage accuracy over an operating junction temperature range of -55°C to 150°C (MP grade).

The LTC3784 is available in SSOP-28 and 4mm x 5mm QFN-28 packages. The LTC3784E and LTC3784I versions operate from a -40°C to 125°C junction temperature. The LTC3784H grade is guaranteed to operate from a -40°C to 150°C operating junction temperature. The LTC3784MP is guaranteed to operate over a -55°C to 150°C operating junction temperature range. The 1,000-piece price starts at $2.47 each. For more information, visit www.linear.com/product/LTC3784.

Summary of Features: LTC3784

  • Wide VIN Range from 4.5V to 60V, Maintains Operation down to 2.3V after Start-Up
  • Up to 60V VOUT Operation
  • Low 28µA Quiescent Current Regulating VOUT at no load
  • Powerful 1.2 Ohm Gate Drivers
  • Up to 97% Efficiency
  • 100% Duty Cycle Capability for Synchronous MOSFET
  • Phase-Lockable Frequency from 75kHz to 850kHz
  • Programmable Fixed Frequency from 50kHz to 900kHz
  • RSENSE or Inductor DCR Current Sensing
  • Current Mode Control
  • ±1% Reference Voltage Accuracy over -55°C to +150°C
  • Programmable Soft-Start
  • Phase Modulation for up to 12 Phases
  • Power Good Output
  • Extended & Industrial Grades: -40°C to 125°C Operating Junction Temp
  • Automotive Temp Grade: -40°C to 150°C Operating Junction Temp
  • Military Temp Grade: -55°C to 150°C Operating Junction Temp

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