Datasheet Linear Technology LTC3456EUF#PBF

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Design Notes

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  Multiple Output DC/DC Converter Runs Off 2-Cell AA Batteries, USB or AC Wall Adapter &mdash DN1006
  PDF, 80 Kb, File published: Sep 13, 2005
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  advertisement Multiple Output DC/DC Converter Runs Off 2-Cell AA Batteries,
  USB or AC Wall Adapter – Design Note 1006
  Gurjit Ghandi and Minjong Kim
  The 3.3V and core supplies are generated by switching
  regulators operating at 1MHz constant frequency. High
  switching frequency allows the use of tiny, low profile
  inductors and capacitors. All switchers are current mode
  PWM type with internal compensation, reducing pin and
  part counts. Introduction
  The LTCВ®3456 is a low profile, total power management
  solution optimized for the confined spaces and diverse
  power requirements of mobile devices, including MP3
  players, portable GPS units, digital cameras and handheld
  computers. The LTC3456 seamlessly manages power
  flow between an AC adapter, USB cable and a 2-cell AA
  battery while complying with USB power standards and
  fits in a 4mm Г— 4mm 24-pin QFN package. Complete Power Solution for Handhelds from
  Two AA Cells
  The circuit shown in Figure 1 generates five output
  voltages from one of three power sources: AC adapter,
  USB or 2-cell alkaline battery. The first output is the Core The device generates two separate power rails: a 3.3V
  (fixed) main supply and a 1.8V (adjustable) core supply.
  In addition, the LTC3456 contains a USB power manager, …

Articles

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  Complete 2-Cell-AA/USB Power Manager in a 4mm × 4mm QFN &mdash LT Journal
  PDF, 391 Kb, File published: Sep 1, 2005
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  DESIGN FEATURES Complete 2-Cell-AA/USB Power
  Manager in a 4mm Г— 4mm QFN by G. Thandi Introduction
  One of the most popular battery solutions for consumer handheld devices
  is the venerable two-cell AA (alkaline
  or nickel-metal hydride) source,
  especially in GPS navigators, digital
  cameras and MP3 players. AA batteries are readily available, relatively
  low cost and offer high power density.
  Many of these same portable devices
  supplement battery power with plugin wall adapter and offer a USB bus
  (for data transfer). The USB bus can
  also be used to provide power. The
  problem is how to seamlessly switch
  between these three disparate types
  of supplies: 2-cell AA, wall and USB.
  The solution is the LTC3456.
  The LTC3456 is a complete system
  power IC that seamlessly manages
  power flow between an AC wall adapter,
  USB and 2-AA battery, while complying with USB power standards—all
  in a 4mm Г— 4mm QFN package
  (Figure1). The device generates two
  separate power rails: a 3.3V (п¬Ѓxed) …

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Manufacturer's Classification

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

Other Names:

LTC3456EUFPBF, LTC3456EUF PBF