Datasheet Linear Technology LTC2928

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Design Notes

• Download
  Power Supply Sequencing Made Simple &mdash DN401
  PDF, 96 Kb, File published: Oct 31, 2006
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  advertisement Power Supply Sequencing Made Simple – Design Note 401
  Bob Jurgilewicz Introduction
  System designers face a number of problems when it
  comes to controlling multiple power supplies. Turn-on
  and turn-off characteristics, supply monitoring, fault
  management and reset generation are a few issues that
  affect both the short term system performance and
  long-term reliability. Design is further complicated by
  a process that often puts п¬Ѓnal decisions about supply
  requirements at the end of the design phase. So, a good
  supervisor/control solution allows for easy design and
  adjustment anywhere in the design process.
  Firmware solutions place a daunting hurdle directly in
  the critical path of the design. Every change involves
  software engineers, a load of testing and worst of all,
  waiting. Loading code during production is time consuming and costly.
  A better solution uses hardware, but easy-to-change,
  relatively inexpensive hardware. How about generic reusable circuit blocks that are added early in the system
  design with little regard to the final specific power requirements? The existing blocks are left unfinished, simply
  waiting for passive component values to be determined.
  When final decisions about the power supplies’ operating
  specifications are determined, calculate the values for a
  few passive components and populate the empty spaces …

• Download
  An Easy Way to Add Auxiliary Control Functions to Hot Swap Cards &mdash DN421
  PDF, 673 Kb, File published: Jul 18, 2007
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  An Easy Way to Add Auxiliary Control Functions to
  Hot Swap Cards – Design Note 421
  Mark Thoren
  Introduction
  A Hot Swapв„ў controller is essential to any system in
  which boards are inserted into a live backplane. The
  controller must gently ramp up the supply voltage and
  current into the card’s bypass capacitors, thus minimizing disturbances on the backplane and to other cards.
  Likewise, it must disconnect a faulty card from the
  backplane if it draws too much current. The controller
  also monitors undervoltage and overvoltage conditions
  on the backplane supply, ensuring reliable operation of
  the card’s circuitry. The LTC4215-1 takes the obvious
  next step and integrates three general purpose I/O (GPIO)
  lines and an accurate ADC into the Hot Swap controller
  to provide quantitative information on board voltage
  and current. Upgrading to the LTC4215-1 is analogous
  to replacing a car’s venerable “Check Engine” light with
  a modern dashboard information display. RS
  0.004Ω VIN
  12V
  133k
  1% …

Articles

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  Sequencer-Supervisor Simplifies Design of Multi-Supply Systems &mdash LT Journal
  PDF, 137 Kb, File published: Nov 22, 2006
  Extract from the document

  LINEAR TECHNOLOGY SEPTEMBER 2006 IN THIS ISSUE…
  Cover Article
  Sequencer-Supervisor Simplifies
  Design of Multi-Supply Systems.1
  Bob Jurgilewicz Issue Highlights.2
  Linear Technology in the News….2
  Design Features
  Reduce the Size and Cost of
  High Current, High-Power-Density
  Systems with Tracking Dual,
  2-Phase, Constant Frequency
  Step-Down Regulator . .6
  Wilson Zhou and Henry Zhang Compact Solution for Hot Swapв„ў
  and Supply Monitoring in
  CompactPCI and PCI Express Systems
  .8
  Pinkesh Sachdev CCD Bias Supply Integrates
  “Output Disconnect,” Schottkys
  and Feedback Resistors.13
  Jesus Rosales Single Device Combines Pushbutton
  On/Off Control, Ideal Diode PowerPathв„ў
  and Accurate System Monitoring.14
  Eko T. Lisuwandi Integrated High Voltage Switching …

Model Line

Manufacturer's Classification

• Monitor, Control and Protection > Sequencers, Trackers, and Margining Controllers > Power Supply Sequencers > Analog Sequencers
• Monitor, Control and Protection > Supervisory Circuits > Quad or More Supply Monitors
• Monitor, Control and Protection > Sequencers, Trackers, and Margining Controllers