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USB power manager stretches battery life

Posted: 07 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:switch? USB? power supply? Li-ion?

Linear Technology Corp. has launched the latest in a family of compact next-generation, multifunction power management products for Li-ion/polymer battery applications.

Dubbed the LTC3567, this buck-boost converter integrates a switching PowerPath manager, a stand-alone battery charger, a 1A high efficiency synchronous buck-boost regulator, an ideal diode and controller, I?C control, including an always-on low dropout regulator, all in a compact, low-profile 4mm x 4mm QFN package. The PowerPath control feature seamlessly manages power flow between multiple input sources such as a wall adapter or USB port and the Lithium battery, while preferentially providing power to the system load. In addition, its instant-on operation ensures power to the system load even with a depleted battery.

For fast charging, the LTC3567's switching input stage converts nearly all of the 2.5W available from the USB port to charging current, enabling up to 700mA from a 500mA limited USB supply and up to 1.5A when wall-powered. An internal 180m ideal diode and optional external ideal diode controller provide a low loss power path from the battery to the system load, minimizing heat generation and maximizing efficiency.

- Ismini Scouras

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