Features and Benefits
- 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 with 4.2V Float Voltage for LTC3455 and 4.1V for LTC3455-1
- 4.1V Float Voltage (LTC3455-1) Improves Battery Life and High Temperature Safety Margin
- 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
The LTC3455/LTC3455-1 are complete 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 complete output disconnect. These devices are available in a 4mm × 4mm 24-pin exposed-pad QFN package.
- Handheld Computers
- Digital Cameras
- MP3 Players
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Demonstration circuit DC631 is a complete power solution for a USB powered device. Power is input from one of three sources, and three outputs are provided, as well as supervisory signals for a microprocessor. DC631 provides the following functions; 700mA CC/CV timer terminated charger suitable for 4.2V Li-Ion cells, USB power manager that insures compliance with the USB power specification, two 1.5MHz synchronous step-down converters and reset and power button status outputs for interfacing with a microprocessor.
Demonstration circuit DC1448 is a complete power solution for a USB powered device. Power is input from one of three sources, and three outputs are provided, as well as supervisory signals for a microprocessor. DC631 provides the following functions; 700mA CC/CV timer terminated charger suitable for 4.1V Li-Ion cells, USB power manager that insures compliance with the USB power specification, two 1.5MHz synchronous step-down converters and reset and power button status outputs for interfacing with a microprocessor.
Technical Articles (2)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.