Datasheet Linear Technology LTC3731

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Design Notes

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  High Efficiency, High Density Power Supply Delivers 200A Without Heat Sinks &mdash DN1001
  PDF, 112 Kb, File published: Dec 2, 2003
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  advertisement High Efficiency, High Density Power Supply Delivers 200A
  Without Heat Sinks – Design Note 1001
  Henry J. Zhang and Wei Chen
  Introduction
  High speed, high capacity data processing systems are
  increasingly hungry for power even as power supply
  voltages drop. The result is unprecedented high current
  demands, increasing the challenges facing power supply
  designers. Power supplies for high end server CPUs must
  be capable of supplying more than 100A, they must
  respond quickly to fast load transients and they must fit
  the same or smaller form factor as previous generation
  power supplies. VIN
  xV TO yV CLKOUT
  C5 1000pF SYNC IN 29
  30
  31 VOS+ R6 0Ω 32
  1 VOS– 2 VDIFFOUT 3 R9 8.06k R10 10k 4
  C10 (OPT) C10 (OPT) 5
  6 MASTER
  ONLY 8 EAIN 9
  10 RUN/SS 11 C16 0.01ВµF
  UVADJ …

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  High Performance 3-Phase Power Supply Delivers 65A and High Efficiency Over the Entire Load Range &mdash DN312
  PDF, 84 Kb, File published: May 3, 2003
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  advertisement High Performance 3-Phase Power Supply Delivers 65A and
  High Efficiency Over the Entire Load Range – Design Note 312
  Wei Chen
  Introduction
  CPUs used in notebook computers and other mobile
  applications now draw more than 30A of current and
  may draw as much as 65A in the near future. For
  these heavy loads, high efficiency power supplies are
  required to protect the system from excessive thermal
  stress. With this in mind, PolyPhaseВ® switching DC/DC
  converters have become the standard for CPU power
  supplies because they are extremely efficient at these
  heavy loads. Nevertheless, for portable applications that
  spend much of the time in sleep or standby modes, light
  load efficiency has also grown in importance, where
  conserving energy for maximum battery run-time is
  also a priority. Unfortunately, traditional PolyPhase
  converters, although exceptional performers at heavy
  loads, do not yield comparable efficiencies at light load.
  Linear Technology Corporation offers a solution to this problem with a new family of PolyPhase controllers that
  allow the design of converters that are efficient over
  the entire CPU load range.
  These new 3-phase controllers, the LTCВ®3730, LTC3731 …

Articles

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  High Performance 3-Phase Power Supplies Yields High Efficiency over the Entire CPU Load Range &mdash LT Journal
  PDF, 200 Kb, File published: Mar 1, 2003
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  DESIGN FEATURES High Performance 3-Phase Power
  Supplies Yields High Efficiency over
  the Entire CPU Load Range
  by Wei Chen and Steve Hobrecht Introduction
  VIN Thermal stress is a major concern for
  enterprise CPUs that frequently draw
  up to 100A of load current. PolyPhaseВ®
  switching DC/DC converters reduce
  thermal stress by providing high efficiency at heavy loads, and thus have
  become the standard power supply
  solution for high powered CPUs.
  PolyPhase switchers are also finding
  their way into mobile applications
  where CPUs are drawing currents
  greater than 30A, and will draw 65A
  in the near future. Mobile CPUs pose
  an additional problem, though. They
  spend much of the time in sleep or
  standby modes, meaning that light
  load efficiency is important to maximize battery run-time. Traditional
  PolyPhase converters, despite their
  exceptional performance at heavy load,
  are not as efficient at light load. …

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  3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning &mdash LT Journal
  PDF, 169 Kb, File published: Mar 25, 2005
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  DESIGN IDEAS 3-Phase Buck Controller
  for Intel VRM9/VRM10 with
  Active Voltage Positioning
  Introduction Accurate Load Line Control Each new generation of CPUs demands
  more from power supplies than the
  last: more power, tighter voltage regulation and faster transient response.
  Meeting all of the new requirements is a
  difficult proposition, but the LTC3738
  helps power supply designers do just
  that. It is a 3-phase buck controller
  with active voltage positioning specifically designed for Intel VRM9 and
  VRM10 (Figure 1). crucial. The current mode architecture
  of the LTC3738 evenly distributes
  the load, and thus thermal stress,
  across the channels. This improves
  the thermal performance and reliability of the entire power solution.
  The LTC3738 also includes a thermal
  detector that generates a VR_HOTB
  warning signal when chip itself gets
  hot (around 120В°C) plus a self-protect
  thermal detector that shuts down the
  device when chip becomes extremely
  hot and endangers the safety of the …

Model Line

Manufacturer's Classification

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