Datasheet Linear Technology LTC3785EUF#PBF

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Design Notes

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  Buck-Boost Controller Simplifies Design of DC/DC Converters for Handheld Products &mdash DN424
  PDF, 96 Kb, File published: Sep 14, 2007
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  advertisement Buck-Boost Controller Simplifies Design of DC/DC Converters for
  Handheld Products – Design Note 424
  David Burgoon
  range. The high level of integration yields a simple, low
  parts-count solution. The LTC3785 provides for currentlimit and shutdown in all modes of operation (which is
  not normally available with boost converters). Introduction
  A number of conventional solutions have been available for
  the design of a DC/DC converter where the output voltage
  is within the input voltage range—a common scenario
  in Li-Ion battery-powered applications—but none were
  very attractive until now. Conventional topologies, such
  as SEPIC or boost followed by buck, have numerous
  disadvantages, including low efficiency, complex magnetics, polarity inversion and/or circuit complexity/cost. The
  LTC®3785 buck-boost controller yields a simple, efficient,
  low parts-count, single-converter solution that is easy
  to implement, thus avoiding the drawbacks associated
  with traditional solutions. Very high efficiency is achieved by synchronous rectification, high side drive (allowing the use of N-channel
  MOSFETs), RDS(ON) current sensing, and Burst Mode В®
  operation for efficient light load operation. Protection
  features include soft-start, overvoltage, undervoltage
  and foldback current-limit with burp-mode or latch-off
  for extended faults.
  3.3V, 3A Converter Operates from 2.7V – 10V Source …

Articles

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  Single-IC Converter Operates Buck and Boost to Provide an Output that is Within the Input Voltage Range &mdash LT Journal
  PDF, 384 Kb, File published: Oct 16, 2007
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  L DESIGN IDEAS Single-IC Converter Operates
  Buck and Boost to Provide an Output
  that is Within the Input Voltage Range
  by David Burgoon Introduction
  Generating an output voltage that
  is always above or below the input
  voltage range can easily be handled
  by conventional boost or buck regulators, respectively. However, when the
  output voltage is within the input voltage range, as in many Li-Ion battery
  powered applications requiring a 3V
  or 3.3V output, conventional designs
  fall short, suffering variously from low
  efficiency, complex magnetics, polarity inversion and circuit complexity.
  The LTC3785 buck-boost controller
  facilitates a simple, efficient, low partscount, single-converter solution that is
  easy to implement and does not have
  any of the drawbacks associated with
  conventional circuits. tion (OVP) and a 2.7V–10V output
  range.
  The circuit produces seamless operation throughout the input voltage
  range, operating as a synchronous
  buck converter, synchronous boost
  2.2nF VOUT …

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Manufacturer's Classification

• Power Management > Switching Regulator > Buck-Boost Regulators > External Power Switch Buck-Boost

Other Names:

LTC3785EUFPBF, LTC3785EUF PBF