USB Power Solution Includes Switching Power Manager,Battery Charger, Three Synchronous Buck Regulators and LDLinear Technology offers a variety of parts to simplify thetask of extracting power from a battery or a USB cable. Thesedevices seamlessly manage the power fl ow between anAC adapter, USB cable and Li-Ion battery, all while maintainingUSB power specifi cation compliance. As batterycapacities rise, battery chargers must keep pace bysteadily improving effi ciency to minimize thermal concernsand charge times. A USB-based battery charger mustsqueeze as much power from the USB as possible, anddo it effi ciently to meet the stringent space and thermalconstraints of today’s power-intensive applications.The LTC®3555 combines a USB switching power managerand battery charger with three synchronous buck regulatorsand an LDO to provide a complete power supplysolution in one small (4mm × 5mm) package (Figure 1).The constant-current, constant-voltage Lithium-Ion/Polymercharger utilizes a Bat-Track™ feature to maximize theeffi ciency of the battery charger by generating an inputvoltage that automatically tracks the battery voltage(described below). An I2C serial interface affords thesystem designer complete control over the charger andthe DC/DC bucks for ultimate adaptability to changingoperating modes in a wide range of applications.
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