Datasheet Linear Technology LTC1646

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Design Notes

• Download
  LTC1646: Power Supply Isolation Controller Simplifies Hot Swapping the CompactPCI Bus for 5V-/3.3V-Only Applications &mdash DN253
  PDF, 226 Kb, File published: Mar 3, 2001
  Extract from the document

  Power Supply Isolation Controller Simplifies Hot Swapping the
  CompactPCI Bus for 5V-/3.3-Only Applications – Design Note 253
  Andy Gardner
  and extraction and reports on the state of the supply
  voltages via the HEALTHY# signal. Although В±12V supplies are provided on the CompactPCI
  backplanes, many plug-in boards only require 5V and
  3.3V. The LTC В®1646 is the ideal power supply isolation
  controller for these applications. LTC1646 Feature Summary
  The LTC1646 features can be summarized as follows: The LTC1646 Hot Swapв„ў controller is designed to
  meet the power supply isolation requirements found
  in the CompactPCI hot swap specification PICMG 2.1
  for plug-in boards requiring 5V and/or 3.3V supplies.
  The chip will turn a board’s supply voltages on and
  off in a controlled manner, allowing the card to be
  safely inserted or removed without causing glitches
  on the power supplies and causing other boards in the
  system to reset. It also protects against short circuits,
  precharges the bus I/O connector pins during insertion
  COMPACT PCI
  CIRCUIT CARD
  CONNECTOR
  (FEMALE) Dual level, programmable circuit breakers: this feature is enabled after power-up is complete. If either
  supply exceeds current limit for more than 20Ојs, …

Articles

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  CompactPCI Hot Swap Controllers with Bus Precharge, On-Chip Intercept of PCI Reset Signal and Much More &mdash LT Journal
  PDF, 175 Kb, File published: Dec 1, 2001
  Extract from the document

  DESIGN FEATURES CompactPCI Hot Swap Controllers
  with Bus Precharge, On-Chip Intercept
  of PCI Reset Signal and Much More
  by Andrew Gardner
  Introduction
  When a circuit board is inserted into
  a “hot” (powered) backplane, its supply bypass capacitors can draw large
  currents from the backplane power
  bus as they charge. These currents
  can cause glitches on the backplane
  supply voltage, resetting other boards
  in the system, and can even damage
  edge connectors. The LTC1644 and
  LTC1646 Hot Swapв„ў controllers
  safely limit these charging currents
  during board insertion into a hot backplane. They also offer several features
  specifically tailored for CompactPCIв„ў
  (CPCI) Hot Swap applications: R2
  0.007Ω
  1% 5VIN MED 5V
  LONG 5V R1
  0.005Ω, 1% 3VIN MED 3.3V
  LONG 3.3V LONG V(I/O) V(I/O) MED –12V SHORT BD_SEL# CompactPCI CONNECTOR D1 R4 …

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Manufacturer's Classification

• Monitor, Control and Protection > Hot Swap Controllers > PCI Hot Swap Controllers | Low Voltage Hot Swap Controllers