Datasheet Linear Technology LTC4098-1 — 数据表

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LTC4098

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• 下载
  High Efficiency USB Power Management System Safely Charges Li-Ion/Polymer Batteries from Automotive Supplies &mdash DN464
  PDF, 98 Kb, 档案已发布: Mar 16, 2009
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  High Efficiency USB Power Management System Safely Charges
  Li-Ion/Polymer Batteries from Automotive Supplies – Design Note 464
  George H. Barbehenn
  In this circuit, the LTCВ®4098 USB power manager/LiIon battery charger controls an LT3480 HV step-down
  regulator. The LTC4098’s Bat-Track™ feature provides
  a high efficiency, low power dissipation battery charger
  from low and high voltages alike. The Bat-Track feature
  controls an internal input current-limited switching regulator to regulate VOUT to approximately VBAT + 0.3V which
  maximizes battery charger efficiency, and thus minimizes
  power dissipation by operating the battery charger with
  minimal headroom. Furthermore, the Bat-Track feature
  reduces charge time by allowing a charge current greater
  than the USB input current limit—the switching regulator
  behaves like a transformer exchanging output voltage for
  output current. Introduction
  Automotive power systems are unforgiving electronic
  environments. Transients to 90V can occur when the
  nominal voltage range is 10V to 15V (ISO7637), along with
  battery reversal in some cases. It’s fairly straightforward
  to build automotive electronics around this system, but
  increasingly end users want to operate portable electronics, such as GPS systems or music/video players,
  and to charge their Li-Ion batteries from the automotive
  battery. To do so requires a compact, robust, efп¬Ѓcient …

文章

• 下载
  Speed Up Li-ion Battery Charging and Reduce Heat with a Switching PowerPath Manager &mdash LT Journal
  PDF, 263 Kb, 档案已发布: Jun 17, 2008
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  LINEAR TECHNOLOGY June 2008 COVER ARTICLE
  Speed Up Li-ion Battery Charging
  and Reduce Heat with a Switching
  PowerPathв„ў Manager.1
  Steven Martin Linear in the News….2
  DESIGN FEATURES
  Hot Swapв„ў Controller Enables
  Standard Power Supplies to
  Share Load .6
  Vladimir Ostrerov Understanding IP2 and IP3 Issues in
  Direct Conversion Receivers for
  WCDMA Wide Area Basestations .10
  Doug Stuetzle Complete Dual-Channel Receiver
  Combines 14-Bit, 125Msps ADCs,
  Fixed-Gain Amplifiers and Antialias
  Filters in a Single 11.25mm Г— 15mm
  ОјModuleв„ў Package.14
  Todd Nelson Battery Manager Enables Integrated,
  Efficient, Scalable and Testable
  Backup Power Systems.17
  Mark Gurries 500nA Supply Supervisors Extend
  Battery Life in Portable Electronics.22
  Bob Jurgilewicz Quad Output Regulator Meets Varied …

• 下载
  1.2A Monolithic Buck Regulator Shrinks Supply Size and Cost with Programmable Output Current Limit &mdash LT Journal
  PDF, 240 Kb, 档案已发布: Mar 1, 2009
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  L DESIGN FEATURES 1.2A Monolithic Buck Regulator
  Shrinks Supply Size and Cost with
  Programmable Output Current Limit
  by Tom Sheehan Introduction
  Power supplies are often overqualified
  for their job. This is because power
  ICs often specify a current limit that
  is more than twice the rated output
  current of the device. The power supply
  components are sized to handle the
  maximum current that the IC can deliver, even if loads are unlikely to draw
  that current during normal operation.
  The components are bigger and more
  expensive than they need to be.
  There is, however, an alternative:
  set an accurate maximum output current on the supply once the real world
  load is known. Accurately setting the
  maximum output current reduces the
  required current rating of the regulator’s power path components, thus
  replacing big, expensive components
  with smaller, less expensive ones.
  A limit on the regulator’s maximum output limits the maximum power
  dissipation of both the supply and …

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• Power Management > PMIC & Multifunction > USB Power Manager (PowerPath, Battery Charger)