Datasheet Linear Technology LTC3774EUHE#TRPBF

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Design Notes

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  Dual Phase Buck Controller Drives High Density 1.2V/60A Supply with Submilliohm DCR Sensing &mdash DN528
  PDF, 227 Kb, File published: May 22, 2014
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  Dual Phase Buck Controller Drives High Density 1.2V/60A
  Supply with Submilliohm DCR Sensing – Design Note 528
  Mike Shriver
  Introduction
  Designers of low output voltage rails for communication, networking, server and industrial systems are
  challenged to achieve greater load currents and higher
  efficiency in diminishing board space. The LTCВ®3774
  dual output buck controller eases this burden by interfacing easily with DrMOS devices, providing high
  efficiency and small size by integrating MOSFET and
  gate driver in the same package. The LTC3774 can
  sense current across the inductor’s DCR, with values as
  low as 0.2mО©, improving efficiency by eliminating the
  need for a discrete sense resistor. The LTC3774’s peak
  current mode architecture provides cycle-by-cycle
  current limit, inherent cycle-by-cycle current sharing
  and easy to design typeВ II compensation. DrMOS Interface
  The PWM outputs of the LTC3774 are designed to drive
  DrMOS devices with a 3-state PWM input. When the
  PWM signal is high, the top FET is on, and when the
  L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and
  PolyPhase are registered trademarks and Hot Swap is a trademark of Linear
  Technology Corporation. All other trademarks are the property of their
  respective owners. 10k …

Articles

• Download
  Dual Phase Buck Controller Drives High Density 1.2V/60A Supply with Sub-Milliohm DCR Sensing &mdash LT Journal
  PDF, 237 Kb, File published: Jul 1, 2014
  Extract from the document

  Dual Phase Buck Controller Drives High Density 1.2V/60A
  Supply with Sub-Milliohm DCR Sensing
  Mike Shriver Designers of low output voltage rails for communication, networking, server and
  industrial systems are challenged to achieve greater load currents and higher
  efficiency in diminishing board space. The LTC3774 dual output buck controller
  eases this burden by interfacing easily with DrMOS devices, providing high efficiency
  and small size by integrating MOSFET and gate driver in the same package. The
  LTC3774 can sense current across the inductor’s DCR, with values as low as
  0.2mО©, improving efficiency by eliminating the need for a discrete sense resistor.
  The LTC3774’s peak current mode architecture provides cycle-by-cycle current limit,
  inherent cycle-by-cycle current sharing and easy to design typeВ II compensation.
  HIGH EFFICIENCY CONVERTER WITH
  A SMALL FOOTPRINT Figure 1 shows a dual phase
  1.2V/60A LTC3774 converter operating
  at a switching frequency of 400kHz.
  The power stage for each phase is the
  FDMF6820A DrMOS, which comes in
  a 6mm Г— 6mm QFN package, and a
  0.3Вµ H single winding ferrite inductor with
  a typical DCR of 0.325mО©. The resulting
  full load efficiency is 89.8%, as shown
  in Figure 2. The core of the converter
  has a current density of 50A /in2. …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | External Power Switch Buck Controllers

Other Names:

LTC3774EUHETRPBF, LTC3774EUHE TRPBF