Datasheet Linear Technology LTC3729

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Application Notes

• Download
  PCB Layout Considerations for Non-Isolated Switching Power Supplies &mdash AN136
  PDF, 215 Kb, File published: Sep 20, 2012
  The best news when you power up a prototype supply board for the very first time is when it not only works, but also runs quiet and cool. Unfortunately, this does not always happen. A common problem of switching power supplies is “unstable” switching waveforms. Sometimes, waveform jittering is so pronounced that audible noise can be heard from the magnetic components. If the problem is related to the printed circuit board (PCB) layout, identifying the cause can be difficult. This is why proper PCB layout at the early stage of a switching supply design is very critical. Its importance cannot be overstated.
  Extract from the document

  Application Note 136
  June 2012
  PCB Layout Considerations for Non-Isolated Switching
  Power Supplies
  Henry J. Zhang
  Introduction
  The best news when you power up a prototype supply board
  for the very first time is when it not only works, but also
  runs quiet and cool. Unfortunately, this does not always
  happen. A common problem of switching power supplies
  is “unstable” switching waveforms. Sometimes, waveform
  jittering is so pronounced that audible noise can be heard
  from the magnetic components. If the problem is related
  to the printed circuit board (PCB) layout, identifying the
  cause can be difficult. This is why proper PCB layout at
  the early stage of a switching supply design is very critical.
  Its importance cannot be overstated.
  The power supply designer is the person who best understands the technical details and functional requirements of
  the supply within the final product. He or she should work
  closely with the PCB layout designer on the critical supply
  layout from the beginning. A good layout design optimizes
  supply efficiency, alleviates thermal stress, and most importantly, minimizes the noise and interactions among traces
  and components. To achieve these, it is important for the …

Design Notes

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  Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
  PDF, 130 Kb, File published: Nov 1, 1999
  Extract from the document

  Design Solutions 10
  November 1999
  Active Voltage Positioning Reduces Output Capacitors
  by Robert Sheehan
  INTRODUCTION
  Power supply performance, especially transient response,
  is key to meeting today’s demands for low voltage, high
  current microprocessor power. In an effort to minimize
  the voltage deviation during a load step, a technique that
  has recently been coined “active voltage positioning” is
  generating substantial interest and gaining popularity in
  the portable computer market. The benefits include lower
  peak-to-peak output voltage deviation for a given load
  step, without having to increase the output filter capacitance. Alternatively, the output filter capacitance can be
  reduced while maintaining the same peak-to-peak transient response.
  BASIC PRINCIPLE
  The term “active voltage positioning” (AVP) refers to
  setting the power supply output voltage at a point that is
  dependent on the load current. At minimum load, the
  output voltage is set to a slightly higher than nominal level.
  At full load, the output voltage is set to a slightly lower than
  nominal level. Effectively, the DC load regulation is
  degraded, but the load transient voltage deviation will be …

Articles

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  Low Voltage, High Current DC/DC Power Supply with Load Sharing and Redundancy &mdash LT Journal
  PDF, 183 Kb, File published: Aug 9, 2004
  Extract from the document

  DESIGN IDEAS Low Voltage, High Current DC/DC
  Power Supply with Load Sharing and
  Redundancy
  by Henry J. Zhang and Wei Chen
  Introduction
  As computer and networking systems
  get larger and faster, their supply
  currents continue to rise and their
  supply voltages continue to drop. Load
  currents are high enough to require
  that power supply designers use several power supply modules in parallel.
  High performance power supplies for
  data-processing and communication
  equipment must also provide exceptional reliability and fault tolerance.
  For example, power systems for mission-critical data processing systems
  are must be functional better than
  99.999% of the time. To satisfy the
  needs of these systems, the power
  management solution must provide
  load sharing, fault tolerance and redundancy.
  This article presents a power management solution that offers all of
  these features in a relatively simple
  circuit that uses the LTC3729 …

Model Line

Manufacturer's Classification

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