Datasheet Linear Technology LTC4217

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Design Notes

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  Hot Swap Controller, MOSFET and Sense Resistor Are Integrated in a 5mm Г— 3mm DFN for Accurate Current Limit and Load Current Monitoring in Tight Spaces &mdash DN466
  PDF, 90 Kb, File published: May 4, 2009
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  Hot Swap Controller, MOSFET and Sense Resistor Are Integrated in
  a 5mm Г— 3mm DFN for Accurate Current Limit and Load Current
  Monitoring in Tight Spaces – Design Note 466
  Vladimir Ostrerov
  Introduction
  In general, a Hot Swapв„ў controller provides two important
  functions to boards that can be plugged and unplugged
  from a live backplane: It limits the potentially destructive inrush current
  when a board is plugged in. It acts as a circuit breaker, with the maximum
  current and maximum time at that current factored
  into the breaker function.
  Two of the components required to implement these
  functions, the power MOSFET and sense resistor, tend
  to dominate the board real estate taken by the Hot Swap
  circuit. The LTCВ®4217 saves space by combining these two
  components with a Hot Swap controller in a 16-pin 5mm Г—
  3mm DFN package (or 20-lead TSSOP). This 2A integrated Hot Swap controller п¬Ѓts easily onto boards operating in
  the voltage range from 2.9V to 26.5V. A dedicated 12V
  version, LTC4217-12, is also available, which contains
  preset 12V specific thresholds. Figure 1 shows how little
  space is required for a complete Hot Swap circuit.
  LTC4217 Features
  Figure 2 shows a simpliп¬Ѓed block diagram of the LTC4217. …

Articles

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  Compact No RSENSE Controllers Feature Fast Transient Response and Regulate to Low VOUT from Wide Ranging VIN &mdash LT Journal
  PDF, 486 Kb, File published: Jun 1, 2009
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  L DESIGN FEATURES Compact No RSENSE Controllers
  Feature Fast Transient Response
  and Regulate to Low VOUT
  from Wide Ranging VIN
  by Terry J. Groom
  Introduction
  The trend in digital electronics is to
  lower voltages and increasing load currents. This puts pressure on DC/DC
  converters to produce low voltages
  from increasingly voltage-variable
  supplies, such as stacked batteries
  and unregulated intermediate power
  buses, so power converters must be
  optimized for low output voltages, low
  duty factors, and wide control bandwidths. To meet these requirements,
  the DC/DC controller IC must offer
  high voltage accuracy, good line and
  load regulation, and fast transient
  response. The constant on-time valley current mode architecture used in
  the LTC3878 and LTC3879 is ideally
  suited to low duty factor operation,
  offering a compact solution with excellent system performance.
  The LTC3878 and LTC3879 are …

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  Improve Hot Swap Performance and Save Design Time with Hot Swap Controller that Integrates 2A MOSFET and Sense Resistor &mdash LT Journal
  PDF, 322 Kb, File published: Jun 1, 2009
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  L DESIGN FEATURES Improve Hot Swap Performance
  and Save Design Time with Hot Swap
  Controller that Integrates 2A MOSFET
  and Sense Resistor
  by David Soo
  Introduction components or easily adjusted using
  resistors and capacitors to better suit a
  large range of applications. The part is
  able to cover a wide 2.9V to 26.5V voltage range and includes a temperature
  and current monitor. The MOSFET
  is kept in the safe-operating–area
  (SOA) by using a time-limited foldback
  current limit and overtemperature
  protection.
  The LTC4217 can be easily applied
  in its basic configuration, or, with a
  few additional external components,
  set up for applications with special
  requirements. Monitoring the MOSFET
  The LTC4217 features MOSFET
  current and temperature monitoring. The current monitor outputs a
  current proportional to the MOSFET
  current, while a voltage proportional …

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Manufacturer's Classification

• Monitor, Control and Protection > Hot Swap Controllers > Low Voltage Hot Swap Controllers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Power Management