DESCRIPTION
The LTC®3455 is a complete power management solution for a variety of portable applications. The device contains two synchronous step-down DC/DC converters, a USB power controller, a full-featured Li-Ion battery charger, a Hot Swap output, a low-battery indicator, and numerous internal protection features. The LTC3455 provides a small, simple solution for obtaining power from three different power sources: a single-cell Li-Ion battery, a USB port, and a wall adapter.

FEATURES
■ Seamless Transition between Input Power Sources:
   Li-Ion Battery, USB, and 5V Wall Adapter
■ Accurate USB Current Limiting (500mA/100mA)
■ Two High Efficiency DC/DC Converters: Up to 96%
■ Thermal Regulation Maximizes Battery Charge
   Rate without Risk of Overheating*
■ Full-Featured Li-Ion Battery Charger
■ Hot Swap™ Output for SDIO and Memory Cards
■ Pin-Selectable Burst Mode® Operation
■ Output Disconnect: All Outputs Discharged to
   Ground During Shutdown
■ Available in a 4mm × 4mm × 0.75mm 24-Pin
   QFN Package

APPLICATIONS
■ Handheld Computers
■ Digital Cameras
■ MP3 Players