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  80V Synchronous 4-Switch Buck-Boost Controller Delivers Hundreds of Watts with 99% Efficiency &mdash DN521
  PDF, 190 Kb, File published: Sep 30, 2013
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  80V Synchronous 4-Switch Buck-Boost Controller Delivers
  Hundreds of Watts with 99% Efficiency – Design Note 521
  Keith Szolusha and Tage Bjorklund Introduction
  A DC/DC converter’s efficiency and component temperature are important considerations in high power applications where high current could overheat the catch
  diode used in an asynchronous buck or boost topology.
  Replacing the catch diode with a synchronous switch
  can significantly improve overall converter efficiency
  and eliminate much of the heat that would be otherwise
  generated in the nonsynchronous catch diode.
  The advantages offered by a synchronous buck or
  boost topology can also be applied to a buck-boost
  topology, where the converter’s output voltage falls
  within its input range. In this case, a synchronous
  4-switch buck-boost converter using a single inductor
  offers the same advantages as a 2-switch synchronous
  buck or boost.
  L1
  22ВµH M1 + CIN2
  4.7ВµF
  Г—4 CIN1
  220ВµF
  Г—2 M2 M4 TO
  DIODE DB2 TG1 BOOST1 SW1 BG1 CSP 1nF 10О© 1nF 10О© …

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Manufacturer's Classification

• Power Management > Switching Regulator > Buck-Boost Regulators > External Power Switch Buck-Boost
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators

Other Names:

LT8705IUHFPBF, LT8705IUHF PBF