Datasheet Linear Technology LT3509IDE#PBF

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  Easy Automotive Power Supplies: Compact Regulator Produces Dual Outputs as Low as 0.8V from 3.6V-36V and is Unfazed by 60V Transients &mdash LT Journal
  PDF, 623 Kb, File published: Jan 1, 2009
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  L DESIGN IDEAS Easy Automotive Power Supplies:
  Compact Regulator Produces Dual
  Outputs as Low as 0.8V from 3.6V–36V
  and is Unfazed by 60V Transients
  by Peter J. Andrews Introduction
  The LT3509 dual channel step-down
  regulator operates over an impressively vast supply range of 3.6V to more
  than 36V, but its real distinguishing
  feature is its ability to handily protect
  both itself and downstream components from transient input voltages
  up to 60V. It accomplishes this by
  entering a safe shutdown mode when
  the supply exceeds 38V, such as load
  dump events in automotive electrical
  systems.
  In a vehicle electrical system,
  overvoltage transients can occur when
  heavy loads are switched because the
  rapid change in current across the wiring inductance induces a high voltage.
  These transients are usually short in
  duration, from several microseconds to
  several milliseconds. Longer duration
  voltage surges can happen when the …

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Manufacturer's Classification

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | Internal Power Switch Buck
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators

Other Names:

LT3509IDEPBF, LT3509IDE PBF