Datasheet Linear Technology LTC3454EDD#TRPBF — Datenblatt

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  High Efficiency, Monolithic Synchronous Buck-Boost LED Driver Drives up to 1A Continuous Current &mdash LT Journal
  PDF, 376 Kb, Datei veröffentlicht: Mar 28, 2006
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  DESIGN FEATURES High Efficiency, Monolithic
  Synchronous Buck-Boost LED Driver
  Drives up to 1A Continuous Current
  by Aspiyan Gazder Introduction
  The LTC3454 is a synchronous buckboost DC/DC converter, designed for
  driving a single high power LED with
  regulated currents up to 1A from a
  single Li-Ion battery. Switching converters are typically used to regulate
  a voltage, but LEDs require constant
  current to generate predictable light
  output. The LTC3454 uses an autozero
  transconductance error amplifier in its
  regulation loop to accurately control
  LED current. The LED current can
  be set to one of four levels, including
  shutdown, using two external resistors
  and dual enable pins. In shutdown no
  current is drawn.
  The wide VIN range of a Lithium-Ion
  battery (2.7V to 4.2V) requires that a
  converter be able to both step-up and
  step-down the input voltage when
  the LED forward voltage is within the …

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• Power Management > LED Driver ICs > Buck-Boost LED Drivers

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LTC3454EDDTRPBF, LTC3454EDD TRPBF