Datasheet Linear Technology LT3433

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Design Notes

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  High Input Voltage Monolithic Switcher Steps Up and Down Using a Single Inductor (Design Note 330A) &mdash DN330
  PDF, 78 Kb, File published: Feb 1, 2004
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  advertisement High Input Voltage Monolithic Switcher Steps Up and Down
  Using a Single Inductor – Design Note 330A
  Jay Celani
  Introduction
  Ultrawide input voltage requirements are a common
  design problem for DC/DC converter applications, but
  when that range includes voltages both above and below
  the output voltage, the converter must perform both
  step-up and step-down functions. The LTВ®3433 is a high
  voltage monolithic DC/DC converter that incorporates
  two switch elements, allowing for a unique topology that
  accommodates both step-up and step-down conversion
  using a single inductor.
  The LT3433 uses a 200kHz constant frequency, current
  mode architecture and operates with input voltages from
  4V to 60V. An internal 1% accurate voltage reference
  allows programming of precision output voltages up
  to 20V using an external resistor divider. Burst ModeВ®
  operation improves efficiencies during light-load conditions, reducing the device’s quiescent current to 100μA
  during no-load conditions. A soft-start feature reduces
  output overshoot and inrush currents during start-up,
  and both current limit foldback and frequency foldback
  are employed to control inductor current runaway during start-up and short-circuit conditions. The LT3433 is …

Articles

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  High Input Voltage Monolithic Switcher Steps Up and Down Using Single Inductor &mdash LT Journal
  PDF, 188 Kb, File published: Dec 1, 2003
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  DESIGN FEATURES High Input Voltage Monolithic
  Switcher Steps Up and Down
  Using Single Inductor
  Introduction Ultra-wide input voltage requirements
  are a common design problem for DC/
  DC converter applications. When that
  range includes voltages both above
  and below the output voltage, a converter must perform both step-up
  and step-down functions, making the
  design problem even more complex.
  A high-voltage input range makes
  the problem even tougher. These
  design issues are commonplace in
  the automotive environment, where battery powered electronics have to
  handle everything from cold crank
  to load dump, a range that can span
  from 4V to 60V. The requirements
  of an automotive battery-powered
  design are somewhat unique, as the
  operational input voltage is typically
  relatively well controlled, but an ultrawide input range must be considered
  since short-duration events can create
  extreme input voltage shifts. …

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Manufacturer's Classification

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Micropower Buck Regulators | High Input Voltage Buck
• Power Management > Switching Regulator > Buck-Boost Regulators > Internal Power Switch Buck-Boost