Datasheet Linear Technology LTC3829

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Application Notes

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  A Closed-Loop, Wideband, 100A Active Load &mdash AN133
  PDF, 1.3 Mb, File published: Oct 12, 2011
  Digital systems, particularly microprocessors, furnish transient loads in the 100A range that a voltage regulator must service. Ideally, regulator output is invariant during a load transient. In practice, some variation is encountered and becomes problematic if allowable operating voltage tolerances are exceeded. 100A load steps, characteristic of microprocessors, exacerbate this issue, necessitating testing the regulator and associated components under such transient loading conditions. To meet this need, a closed-loop, 500kHz bandwidth, linearly responding, 100A capacity active load is described in this document.
  Extract from the document

  Application Note 133
  October 2011
  A Closed-Loop, Wideband, 100A Active Load
  Brute Force Marries Controlled Speed
  Jim Williams
  Introduction
  Digital systems, particularly microprocessors, furnish
  transient loads in the 100A range that a voltage regulator
  must service. Ideally, regulator output is invariant during
  a load transient. In practice, some variation is encountered
  and becomes problematic if allowable operating voltage
  tolerances are exceeded. 100A load steps, characteristic
  of microprocessors, exacerbate this issue, necessitating
  testing the regulator and associated components under
  such transient loading conditions. To meet this need, a
  closed-loop, 500kHz bandwidth, linearly responding, 100A
  capacity active load is described below. pulse switches the FET via a drive stage, generating a
  transient load current out of the regulator and its output
  capacitors. The size, composition and location of these
  capacitors has a pronounced effect on transient response
  and must be quite carefully considered. Although the
  electronic control facilitates high speed switching, the
  architecture cannot emulate loads between the minimum …

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  Basic Concepts of Linear Regulator and Switching Mode Power Supplies &mdash AN140
  PDF, 715 Kb, File published: Oct 1, 2013
  Extract from the document

  Application Note 140
  October 2013
  Basic Concepts of Linear Regulator and Switching
  Mode Power Supplies
  Henry J. Zhang
  ABSTRACT
  This article explains the basic concepts of linear regulators
  and switching mode power supplies (SMPS). It is aimed
  at system engineers who may not be very familiar with
  power supply designs and selection. The basic operating
  principles of linear regulators and SMPS are explained
  and the advantages and disadvantages of each solution
  are discussed. The buck step-down converter is used as
  an example to further explain the design considerations
  of a switching regulator.
  INTRODUCTION
  Today’s designs require an increasing number of power
  rails and supply solutions in electronics systems, with
  loads ranging from a few mA for standby supplies to over
  100A for ASIC voltage regulators. It is important to choose
  the appropriate solution for the targeted application and
  to meet specified performance requirements, such as
  high efficiency, tight printed circuit board (PCB) space, …

Design Notes

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  High Efficiency, High Density 3-Phase Supply Delivers 60A with Power Saving Stage Shedding, Active Voltage Positioning and Nonlinear Control for Superior Load Step Response &mdash DN489
  PDF, 100 Kb, File published: Mar 18, 2011
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  High Efficiency, High Density 3-Phase Supply Delivers 60A with
  Power Saving Stage Shedding, Active Voltage Positioning
  and Nonlinear Control for Superior Load Step Response
  Design Note 489
  Jian Li and Kerry Holliday
  Introduction
  The LTC В®3829 is a feature-rich single output 3-phase
  synchronous buck controller that meets the power density demands of modern high speed, high capacity data
  processing systems, telecom systems, industrial equipment and DC power distribution systems. The LTC3829’s
  features include: 4.5V to 38V input range and 0.6V to 5V output range 3-phase operation for low input current ripple and
  output voltage ripple with Stage Sheddingв„ў mode to
  yield high light load efficiency On-chip drivers in a 38-pin 5mm × 7mm QFN (or 38-pin
  FE) package to satisfy demanding space requirements
  L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered
  trademarks and Stage Shedding is a trademark of Linear Technology Corporation. All
  other trademarks are the property of their respective owners.
  VIN VIN
  10ОјF
  16V
  X5R 2.2О©
  VIN 100k
  0.1ОјF
  DIFFOUT 30.1k 13.5k 13 …

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Manufacturer's Classification

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