Multifunction power manager

11 July 2007 Power Electronics / Power Management

The LTC3555 from Linear is the first in a family of multifunction power management solutions for Li-Ion/Polymer battery applications. It integrates a switching PowerPath manager, a standalone battery charger, an ideal diode, I²C control, three high efficiency synchronous buck regulators plus an always-on LDO, all in a compact, low-profile 4 mm x 5 mm QFN package. The PowerPath control feature seamlessly manages power flow between an AC wall adapter or USB port, Li-Ion battery and system load while its 'instant-ON' operation ensures system load power even with a dead or missing battery. For fast charging, the switching input stage converts nearly all of the 2,5 W available from the USB port to charging current, enabling up to 700 mA from a 500 mA limited USB supply and up to 1,5 A when wall powered. An internal 180 mΩ ideal diode plus optional external ideal diode controller provide a low loss power path, further minimising heat generation and maximising efficiency. Burst Mode operation optimises efficiency at light loads with a quiescent current of only 35 μA per regulator (<1 μA in shutdown).

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