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Small power solution IC integrates battery charger, diode, LDO

Posted: 17 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion/polymer battery? power solution? power management? synchronous buck regulators?


Linear Technology Corp. unveils the LTC3557, a multifunction power management solution for Li-ion/polymer battery applications.

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. LTC3557's three integrated synchronous buck regulators feature 100 percent 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 percent, maximizing battery run time. Moreover, pin-selectable Burst Mode operation optimizes efficiency at light loads with a quiescent current of only 35?A per regulator (The LTC3557's standalone autonomous operation simplifies design, eliminating the need for an external microprocessor for charge termination. To preserve battery energy, the IC draws LTC3557 is available from stock in a compact, low-profile (0.75mm) 4mm x 4mm QFN-28 package. Pricing starts at $3.95 each for 1,000-piece quantities.

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