Datasheet Linear Technology LTC1773

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Design Notes

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  High Efficiency Adaptable Power Supply for XENPAK 10Gb/s Ethernet Transceivers &mdash DN295
  PDF, 82 Kb, File published: Sep 3, 2002
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  advertisement High Efficiency Adaptable Power Supply for XENPAK 10Gb/s
  Ethernet Transceivers
  Design Note 295
  Dongyan Zhou
  Introduction
  The XENPAK Multisource Agreement (MSA) defines a
  п¬Ѓber optic module that conforms to the 10Gb/s Ethernet
  standard specified by IEEE 802.3ae. These modules
  require an adaptable power supply rail (APS) that has
  a variable output voltage from 0.9V to 1.8V, generated from a 3.3V input. The LTC В®1773 current mode
  synchronous buck regulator provides an efficient, cost
  effective and space saving APS solution that exceeds
  the MSA standard as well as other similar standards.
  The LTC1773 has features that make it a good match
  for this application including its 0.8V reference and
  2.65V minimum input voltage. The reference is В±1.5%
  accurate over temperature which makes it easy to
  meet the ±4% APS tolerance specified in the MSA.
  The operating frequency is internally set at 550kHz,
  allowing the use of small surface mount components.
  Synchronous rectification increases efficiency and
  eliminates the need for an external Schottky diode,
  saving additional cost and space. Finally, the LTC1773 comes in a tiny 10-lead MSOP package, keeping the total …

Articles

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  Synchronous Buck Controller Extends Battery Life and Fits in a Small Footprint &mdash LT Journal
  PDF, 172 Kb, File published: Feb 1, 2001
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  DESIGN FEATURES Synchronous Buck Controller Extends
  Battery Life and Fits in a Small Footprint
  by Peter Guan Introduction Operation Portable electronic devices continue
  to decrease in size and their supply
  voltages are also falling, but load current requirements are increasing as a
  result of higher processing speed and
  improved features. This trend places
  more constraints on today’s portable
  power supplies, but Linear Technology has the solution. The LTC1773 is
  a synchronous DC/DC controller that
  packs high output current capability
  and low operating quiescent current
  in a small MSOP-10 package. Its input
  voltage range is from 2.65V to 8.5V;
  this is ideal for 1-or 2-cell Li-Ion
  batteries as well as 3-to 6-cell NiCd
  and NiMH battery packs because it
  allows the batteries to operate near
  end of charge. A precise internal
  undervoltage lockout circuit prevents
  deep discharge of the battery below
  2.5V. Popular features such as OPTILOOPв„ў compensation, soft start and
  Burst Modeв„ў operation are also …

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Manufacturer's Classification

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > External Power Switch Buck Controllers