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USB battery charger with buck converters roll

Posted: 18 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power management? synchronous buck regulators? linear battery charger? USB?

Linear Technology Corp. unveils the LTC3559, an efficient, multifunction power management solution for handheld applications.

LTC3559 integrates a standalone Li-ion/polymer battery charger and two high efficiency synchronous buck regulators and is offered in a low-profile 3-by-3mm DFN package. The linear battery charger can deliver up to 950mA charge current from a wall adapter supply, or up to 500mA charge current from a USB supply. It contains a high degree of USB functionality, including 20 percent/100 percent full-scale charge current setting, a SUSP pin for shutdown/enable and four different indication states on the /CHRG pin. Standalone autonomous operation simplifies design, eliminating the need for an external microprocessor for charge termination. The final battery float voltage is accurate to 0.4 percent. The charger's patented thermal regulation scheme maximizes the charge rate without the risk of overheating, while the NTC input allows temperature-qualified charging. To preserve battery energy, the LTC3559 draws LTC3559's integrated synchronous buck regulators feature 100 percent duty cycle operation and are capable of delivering output currents up to 400mA each, with programmable output voltages as low as 0.8V. The internal low RDS(ON) switches enable efficiencies up to 90 percent, maximizing battery run time. Moreover, burst mode operation optimizes efficiency at light loads with a quiescent current of only 35?A (LTC3559 is available from stock in a compact low-profile (0.75mm) 3-by-3mm QFN-16 package. Pricing starts at $2.15 each for 1,000-piece quantities.

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