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Linear USB Power Manager Handles Power Selection, Battery Charging & Integrates Three Buck Regulators
a multi-function power management solution for Li-Ion/Polymer battery applications. The LTC3557 integrates a linear PowerPath™ manager, a standalone battery charger, ideal diode, three high efficiency synchronous buck regulators and an always-on LDO in a low-profile
4mm x 4mm QFN package. The powerpath manager seamlessly manages the transition between multiple input sources and power to the load, while for fast charging the linear battery charger delivers up to 1.5A charge current from a wall adapter supply or up to 500mA charge current from a USB port. The LTC3557’s three integrated synchronous buck regulators feature 100% duty cycle operation and are capable of delivering output currents of 600/400/400mA respectively, with adjustable output voltages down to 0.8V. The high 2.25MHz switching frequency allows the use of tiny low cost capacitors and inductors less than 1mm in height. The internal low RDS(ON) switches enable efficiencies as high as 95%, maximizing battery run time. In addition, pin-selectable Burst Mode® operation optimizes efficiency at light loads with a quiescent current of only 35uA per regulator (
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