Linear Technology Launches Switch-mode USB Power Manager with Integrated 1A Buck-boost

(Product News, 26 Feb 2008)

Linear Technology Corp. has released the LTC3566, the latest in a family of compact next-generation, multi-function power management solutions for Li-ion/Li-polymer battery applications. The LTC3566 integrates a switching PowerPath manager, a stand-alone battery charger, a 1A high efficiency synchronous buck-boost regulator, an ideal diode and controller, and an always-on LDO, all in a compact 4x4mm QFN package.

For fast charging, the LTC3566'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 plus optional external ideal diode controller provide a low loss power path from the battery to the system load, further minimizing heat generation and maximizing efficiency.

The LTC3566¡¯s onboard synchronous buck-boost regulator can deliver up to 1A continuously and is ideal for efficiently regulating a 3.3V output voltage over the full Lithium battery voltage range, down to 2.75V input. The regulator's internal low RDS(ON) switches enable efficiency as high as 94 percent, maximizing battery run time. In addition, Burst Mode operation optimizes efficiency at light loads with a quiescent current of only 20µA.

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