Datasheet Linear Technology LTC3443EDE#PBF

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Design Notes

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  Simple Battery Circuit Extends Power over Ethernet (PoE) Peak Current &mdash DN361
  PDF, 82 Kb, File published: Feb 17, 2005
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  Simple Battery Circuit Extends Power over Ethernet (POE)
  Peak Current – Design Note 361
  Mark Gurries
  Introduction
  Power over Ethernet (PoE) is a new development that allows for the delivery of power to Ethernet-based devices
  via standard Ethernet CAT5 cable, precluding the need
  for wall adapters or other external power sources. The
  PoE specification defines a hardware detection protocol
  where Power Sourcing Equipment (PSE) is able to identify
  PoE Powered Devices (PDs), thus allowing full backwards
  compatibility with non-PoE-aware (legacy) Ethernet devices. The PoE specification also sets an upper limit
  on the power that can be drawn by a PD. The problem
  is: what happens when a PD must draw more power
  than allowed by the PoE standard? Examples may be
  the spin up of a disk drive or a period of sustained
  transmission of data from an RF transmitter. If the
  average power load of these applications is less than
  L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  and PowerPath is a trademark of Linear Technology Corporation. All other
  trademarks are the property of their respective owners. L1
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Articles

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  Buck-Boost Converter Minimizes Output Voltage Transients from Very Low to High Output Current &mdash LT Journal
  PDF, 144 Kb, File published: Mar 25, 2005
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  DESIGN IDEAS Buck-Boost Converter Minimizes
  Output Voltage Transients from
  Very Low to High Output Current
  Introduction
  Most handheld devices incorporate
  a low power mode (Burst Mode operation) to save precious battery life
  during an extended period of inactivity.
  Transitions from Burst Mode operation, however, can induce transient
  perturbations in the output voltage,
  which drain the battery unnecessarily.
  The LTC3443 Buck-Boost converter
  minimizes output voltage transient
  perturbations, and thus realizes the
  promise of Burst Mode operation to
  significantly increase battery run
  time.
  The LTC3443 incorporates an adaptive clamp on the VC pin—active during
  Burst Mode operation—which holds
  the error amp integrator capacitor
  to a п¬Ѓxed voltage determined by the
  input and output voltage. The clamp
  is removed when the LTC3443 is commanded out of Burst Mode operation.
  In this way, the compensation capacitors are already close to the nominal …

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Manufacturer's Classification

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

Other Names:

LTC3443EDEPBF, LTC3443EDE PBF