Datasheet Linear Technology LTM4641

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Design Notes

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  10A ОјModule Step-Down Regulator with Advanced Input and Load Protection &mdash DN527
  PDF, 173 Kb, File published: May 7, 2014
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  10A ВµModule Step-Down Regulator with Advanced Input
  and Load Protection
  Design Note 527
  Yan Liang
  Introduction
  Bus voltage surges pose a danger not only to the DC/DC
  converter, but also to the load. Traditional overvoltage
  protection schemes involving a fuse are not necessarily
  fast enough, nor dependable enough to protect loads
  such as FPGAs, ASICs and microprocessors. A better
  solution is to accurately and quickly detect an overvoltage condition and respond by quickly disconnecting the
  input supply while discharging excess voltage at the
  load with a low impedance path. This is possible with
  the protection features in the LTMВ® 4641.
  Power and Protection
  The LTM4641 is a 4.5V to 38V input, 0.6V to 6V output,
  10A step-down ОјModule В® regulator with advanced
  input and load protection options, including:
  (A) Input Protection Undervoltage lockout, overvoltage shutdown with
  latchoff thresholds N-Channel overvoltage power-interrupt MOSFET
  driver Surge stopper capable with few external components (B) Load Protection Robust, resettable latchoff overvoltage protection N-Channel overvoltage crowbar power MOSFET
  driver
  In addition, trip detection thresholds for the following …

Articles

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  µModule Regulator Powers and Protects Low Voltage µProcessors, ASICs and FPGAs from Intermediate Bus Voltage Surges &mdash LT Journal
  PDF, 2.8 Mb, File published: Jul 9, 2013
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  ВµModule Regulator Powers and Protects Low Voltage
  ВµProcessors, ASICs and FPGAs from Intermediate Bus
  Voltage Surges
  Willie Chan and Jason Sekanina Intermediate bus voltages of 24V~28V nominal are
  commonplace in industrial, aerospace and defense
  systems where series-connected batteries may be a
  backup power source and 12V bus architectures tend to
  be impractical due to distribution losses. The widening
  voltage gap between the system bus and the power
  inputs of digital processors present design challenges
  relating to power delivery, safety and solution size.
  If a single-stage non-isolated step-down
  DC/DC converter is used at the point of
  load, it must operate with extremely
  accurate PFM/PWM timing. Input surge
  events can stress DC/DC converters,
  presenting an overvoltage risk to the
  load. Erroneous or counterfeit capacitors introduced in manufacturing may
  cause output voltage excursions exceeding
  the load’s ratings potentially causing the
  FPGA, ASIC or microprocessor to ignite.
  Depending on the extent of the damage,
  the root cause may be difficult to find. …

Model Line

Manufacturer's Classification

• Monitor, Control and Protection > Surge Stopper, Overvoltage & Overcurrent Protection
• Power Management > Switching Regulator > Step-Down (Buck) Regulators > High Input Voltage Buck
• µModule Solutions > µModule Regulators > µModule Buck Regulators | Extended Temperature (H & MP) µModule Regulators