LTC3557/LTC3557-1 - USB Power Manager with Li-Ion Charger and Three Step-Down Regulators
Features
- Seamless Transition Between Input Power Sources: Li-Ion Battery, USB, 5V Wall Adapter or High Voltage Buck Regulator with Bat-Track
- 200mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss Power Path When Input Current is Limited or Unavailable
- Triple Adjustable High Efficiency Step-Down Switching Regulators (600mA, 400mA, 400mA IOUT)
- Pin Selectable Burst Mode Operation
- Full Featured Li-Ion/Polymer Battery Charger
- 1.5A Maximum Charge Current with Thermal Limiting
- Battery Float Voltage:
4.2V (LTC3557)
4.1V (LTC3557-1) - Low Profile 4mm x 4mm 28-Pin QFN Package
Typical Application
Description
The LTC®3557/LTC3557-1 is a highly integrated power management and battery charger IC for single cell Li-Ion/ Polymer battery applications. It includes a PowerPath™ manager with automatic load prioritization, a battery charger, an ideal diode and numerous internal protection features. Designed specifically for USB applications, the LTC3557/LTC3557-1 power manager automatically limits input current to a maximum of either 100mA or 500mA for USB applications or 1A for wall adapter powered applications. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit. The LTC3557/LTC3557-1 also includes three adjustable synchronous step-down switching regulators and a high voltage buck regulator output controller with Bat-Track that allows efficient charging from supplies as high as 38V. The LTC3557/LTC3557-1 is available in a low profile 4mm × 4mm × 0.75mm 28-pin 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 |
|---|---|---|---|---|---|
| LTC3557EUF-1#PBF | 4x4 QFN-28 | UF | E | 05-08-1721 | Yes |
| LTC3557EUF-1#TRPBF | 4x4 QFN-28 | UF | E | 05-08-1721 | Yes |
| LTC3557EUF#PBF | 4x4 QFN-28 | UF | E | 05-08-1721 | Yes |
| LTC3557EUF#TRPBF | 4x4 QFN-28 | UF | E | 05-08-1721 | 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 | |
|---|---|---|---|---|---|---|
| LTC3557EUF-1#PBF | 4x4 QFN-28 | E | $5.64 | $3.95 | Yes | |
| LTC3557EUF-1#TRPBF | 4x4 QFN-28 | E | $4.01 | Yes | ||
| LTC3557EUF#PBF | 4x4 QFN-28 | E | $5.64 | $3.95 | Yes | |
| LTC3557EUF#TRPBF | 4x4 QFN-28 | E | $4.01 | 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 |
|---|---|---|---|
| DC1138A-A | LTC3557EUF/LT3505EDD Demo Board | PMIC Plus HV Buck, USB Pwr Manager w/ 0.5A Li-Ion Charger & Three Bucks Plus HV Buck Controller | $150.00 | |
| DC1138A-B | LT3557EUF-1/LT3505EDD Demo Board | PMIC Plus HV Buck, USB Pwr Manager w/ 0.5A Li-Ion Charger & Three Bucks Plus HV Buck Controller | $150.00 | |
| DC1142A-A | LTC3557/-1 | USB Pwr Manager w/ Li-Ion/Polymer Charger & Three Buck Regulator | Contact Factory | |
| DC1142A-B | LTC3557/-1 | USB Pwr Manager w/ Li-Ion/Polymer Charger & Three Buck Regulator | Contact Factory | |
| Buy Now | |||
Applications
- HDD-Based MP3 Players
- PDA, PMP, PND/GPS
- USB-Based Handheld Products
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Product Notifications
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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.
