Datasheet Linear Technology LTC3455

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LTC3455-1

Design Notes

• Download
  Simple, Efficient, All-in-One USB Power Management IC Solution &mdash DN1008
  PDF, 66 Kb, File published: Aug 1, 2004
  Extract from the document

  advertisement Simple, Efficient, All-in-One USB Power Management IC Solution
  Design Note 1008
  John Shannon
  Introduction
  Linear Technology offers a variety of devices that simplify
  converting power from a USB cable, but the LTCВ®3455
  represents the highest level of functional integration yet
  achieved. The LTC3455 seamlessly manages power flow
  between an AC adapter, USB cable and Li-ion battery,
  while complying with USB power standards, all from a
  4mm Г— 4mm QFN package. In addtion, two high efficiency
  synchronous buck converters generate low voltage rails
  which most USB-powered peripherals require. The
  LTC3455 also provides power-on reset signals for the
  microprocessor, a Hot SwapTM output for powering
  memory cards as well as an uncommitted gain block
  suitable for use as a low-battery comparator or an LDO
  controller. The PCB real estate required for the entire USB
  power control circuit and two DC/DC converters is only
  225mm2.
  The simplified block diagram of the LTC3455 in Figure 1
  shows the major components that allow the LTC3455 to
  accomplish multiple functions. The DC/DC conversion is …

Articles

• Download
  Complete USB Power Manager, Li-Ion Charger and Two Buck Converters in a 4mm x 4mm QFN &mdash LT Journal
  PDF, 272 Kb, File published: Feb 1, 2004
  Extract from the document

  LINEAR TECHNOLOGY FEBRUARY 2004 IN THIS ISSUE…
  COVER ARTICLE
  Complete USB Power Manager, Li-Ion
  Charger and Two Buck Converters
  in a 4mm Г— 4mm QFN . 1
  Bryan Legates Issue Highlights . 2
  LTC in the News…. 2
  DESIGN FEATURES
  Easy-to-Use Spread Spectrum Clock
  Generator Reduces EMI and More . 6
  Tim Regan and Doug La Porte Monolithic Ideal Diode
  Prolongs Battery Life. 10
  Andrew Bishop Versatile Power Supply
  Tracking without MOSFETs. 13
  Dan Eddleman Compact, Versatile, Accurate,
  3-State Programmable Power
  Supply Supervisors. 19
  Eko T. Lisuwandi 2-Phase Controller Makes Small,
  Fast and Efficient Power Supplies
  with Output Tracking. 24
  David Chen DESIGN IDEAS
  . 27–36
  (complete list on page 27) New Device Cameos. 37 VOLUME XIV NUMBER 1 Complete USB Power …

• Download
  New Family of Integrated Power Controllers Combine Fast Battery Charging, PowerPath Control and Efficient DC/DC Converters in Less Than 20mm2 &mdash LT Journal
  PDF, 303 Kb, File published: Sep 23, 2008
  Extract from the document

  L DESIGN FEATURES New Family of Integrated Power
  Controllers Combine Fast Battery
  Charging, PowerPath Control and
  Efficient DC/DC Converters in
  by Sam Nork
  Less Than 20mm2
  Introduction
  The quickest way to build an efficient
  power system for a battery-powered
  portable application is to use an
  IC that combines all power control
  functions into a single chip, namely a
  Power Management Integrated Circuit
  (PMIC). PMICs seamlessly manage
  power flow from various power sources
  (wall adapters, USB and batteries) to
  power loads (device systems and the
  charging battery), while maintaining
  current limits where required (such
  as that specified for USB). To this
  end, PMICs typically feature built-in
  PowerPathв„ў control, DC/DC conver-USB/WALL
  4.35V TO 5.5V TO OTHER …

Model Line

Manufacturer's Classification

• Power Management > PMIC & Multifunction > PMIC (DC/DC, PowerPath and Battery Charger)