LTC3455/LTC3455-1 - Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
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 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
Typical Application
Description
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.Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3455EUF-1#PBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
| LTC3455EUF-1#TRPBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
| LTC3455EUF#PBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
| LTC3455EUF#TRPBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3455EUF-1#PBF | 4x4 QFN-24 | E | $5.64 | $3.95 | Yes | |
| LTC3455EUF-1#TRPBF | 4x4 QFN-24 | E | $4.01 | Yes | ||
| LTC3455EUF#PBF | 4x4 QFN-24 | E | $5.64 | $3.95 | Yes | |
| LTC3455EUF#TRPBF | 4x4 QFN-24 | E | $4.05 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1448A | LTC3455EUF-1 Demo Board | USB Power Solution, USB / 5V Adapter Input, Linear Li-Ion Charger, Dual Sync Buck 3.15V @ 500mA, 1.8V @ 400mA | Contact Factory | |
| DC631B | LTC3455EUF Demo Board | USB Power Solution, USB / 5V Adapter Input, Linear Li-Ion Charger, Dual Sync Buck 3.15V @ 500mA, 1.8V @ 400mA | $150.00 | |
| Buy Now | |||
Applications
- Handheld Computers
- Digital Cameras
- MP3 Players
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
