LTC3455 Datasheet | Linear Technology

LTC3455/LTC3455-1 Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger Features DESCRIPTION n Seamless Transition between Input Power Sources: Li-Ion Battery, USB, and 5V Wall Adapter n Accurate USB Current Limiting (500m A/100m A) n Two High Efficiency DC/DC Converters: Up to 96% n Thermal Regulation Maximizes Battery Charge Rate without Risk of Overheating n Full-Featured Li-Ion Battery Charger with 4.2V Float Voltage for LTC3455 and 4.1V for LTC3455-1 n 4.1V Float Voltage (LTC3455-1) Improves Battery Life and High Temperature Safety Margin n Hot Swap™ Output for SDIO and Memory Cards n Pin-Selectable Burst Mode® Operation n Output Disconnect: All Outputs Discharged to Ground During Shutdown n Available in a 4mm × 4mm × 0.75mm 24-Pin QFN Package APPLICATIONS n Handheld puters n Digital Cameras n MP3 Players The LTC®3455/LTC3455-1 are plete power management solutions for a variety of portable applications. These devices contain 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/LTC3455-1 provide 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. Current drawn from the USB bus is accurately limited under all conditions. Whenever a USB or a wall adapter is present, the battery charger is enabled and all internal power for the device is drawn from the appropriate external power source. All outputs are discharged to ground during shutdown to provide plete output disconnect. These devices are available in a 4mm × 4mm 24-pin exposedpad QFN package. L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including...