LTC3455EUF

Product Summary

The LTC3455EUF is a Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger which is a complete power management solution for a variety of portable applications. The LTC3455EUF 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 LTC3455EUF 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.The LTC3455EUF is designed for Handheld Computers,Digital Cameras and MP3 Players.

Parametrics

LTC3455EUF absolute maximum ratings: (1)Transient (t < 1ms and Duty Cycle < 1%): VMAX USB Voltages: –0.3V to 7V; (2)Steady State: VBAT, VMAX, USB Voltages: –0.3V to 6V; (3)SW1, SW2 Voltages: –0.3V to (VMAX + 0.3V); (4)TIMER Voltage: –0.3V to (VMAX + 0.3V); (5)PWRON, ON, ON2, HSON Voltages: –0.3V to 6V; (6)PBSTAT, RST, CHRG, AO Voltages: –0.3V to 6V; (7)HSI, HSO Voltages: –0.3V to 6V; (8)MODE, USBHP, SUSPEND Voltages: –0.3V to 6V; (9)WALLFB, AI, PROG Voltages: –0.3V to 2V; (10)FB1, FB2 Voltages: –0.3V to 2V; (11)Junction Temperature: 125℃; (12)Operating Temperature Range: –40℃ to 85℃; (13)Storage Temperature Range: –65℃ to 125℃.

Features

LTC3455EUF features: (1)Seamless Transition between Input Power Sources: Li-Ion Battery, USB, and 5V Wall Adapter; (2)Accurate USB Current Limiting (500mA/100mA); (3)Two High Effi ciency DC/DC Converters: Up to 96%; (4)Thermal RegulatioMaximizes Battery Charge Rate without Risk of Overheating; (5)Full-Featured Li-IoBattery Charger with 4.2V Float Voltage for LTC3455 and 4.1V for LTC3455-1; (6)4.1V Float Voltage (LTC3455-1) Improves Battery Life and High Temperature Safety Margin; (7)Hot Swap Output for SDIO and Memory Cards; (8)Pin-Selectable Burst Mode?Operation; (9)Output Disconnect: All Outputs Discharged to Ground During Shutdown ; (10)Available in a 4mm × 4mm × 0.75mm 24-Pin QFN Package.

Diagrams