LTC3554/LTC3554-1/ LTC3554-2/LTC3554-3 - Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
Features
- 10μA Standby Mode Quiescent Current (All Outputs On)
- Seamless Transition Between Input Power Sources: Li-Ion/Polymer Battery and USB
- 240mΩ Internal Ideal Diode
- Dual High Efficiency Step-Down Switching Regulators (200mA IOUT) with Adjustable Output Voltages
- Pushbutton On/Off Control with System Reset
- Reset Time: 5 sec (LTC3554/LTC3554-1), 14 sec (LTC3554-2/LTC3554-3)
- Full Featured Li-Ion/Polymer Battery Charger
- Programmable Charge Current with Thermal Limiting
- Instant-On Operation with Discharged Battery
- Battery Float Voltage: 4.2V (LTC3554/LTC3554-2/LTC3554-3), 4.1V (LTC3554-1)
- 3mm × 3mm × 0.75mm 20-Lead QFN Package
Typical Application
Description
The LTC®3554 family* are micropower, highly integrated power management and battery charger ICs for single-cell Li-Ion/Polymer battery applications. They include a PowerPath™ manager with automatic load prioritization, a battery charger, an ideal diode and numerous internal protection features. Designed specifically for USB applications, the LTC3554 power managers automatically limit input current to a maximum of either 100mA or 500mA. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the selected input current limit.
The LTC3554 also includes two synchronous step-down switching regulators as well as a pushbutton controller. With all supplies enabled in standby mode, the quiescent current drawn from the battery is only 10μA. The LTC3554 family are available in a 3mm × 3mm × 0.75mm 20-lead 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 |
|---|---|---|---|---|---|
| LTC3554EUD-1#PBF | 3x3 QFN-20 | UD | E | 05-08-1720 | Yes |
| LTC3554EUD-1#TRPBF | 3x3 QFN-20 | UD | E | 05-08-1720 | Yes |
| LTC3554EUD-2#PBF | 3x3 QFN-20 | UD | E | 05-08-1720 | Yes |
| LTC3554EUD-2#TRPBF | 3x3 QFN-20 | UD | E | 05-08-1720 | Yes |
| LTC3554EUD-3#PBF | 3x3 QFN-20 | UD | E | 05-08-1720 | Yes |
| LTC3554EUD-3#TRPBF | 3x3 QFN-20 | UD | E | 05-08-1720 | Yes |
| LTC3554EUD#PBF | 3x3 QFN-20 | UD | E | 05-08-1720 | Yes |
| LTC3554EUD#TRPBF | 3x3 QFN-20 | UD | E | 05-08-1720 | 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 | |
|---|---|---|---|---|---|---|
| LTC3554EUD-1#PBF | 3x3 QFN-20 | E | $3.36 | $2.35 | Yes | |
| LTC3554EUD-1#TRPBF | 3x3 QFN-20 | E | $2.41 | Yes | ||
| LTC3554EUD-2#PBF | 3x3 QFN-20 | E | $3.36 | $2.35 | Yes | |
| LTC3554EUD-2#TRPBF | 3x3 QFN-20 | E | $2.41 | Yes | ||
| LTC3554EUD-3#PBF | 3x3 QFN-20 | E | $3.36 | $2.35 | Yes | |
| LTC3554EUD-3#TRPBF | 3x3 QFN-20 | E | $2.41 | Yes | ||
| LTC3554EUD#PBF | 3x3 QFN-20 | E | $3.36 | $2.35 | Yes | |
| LTC3554EUD#TRPBF | 3x3 QFN-20 | E | $2.41 | 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 |
|---|---|---|---|
| DC1468A | LTC3554EPD Demo Board | Micropower USB Power Manager with Li-Ion Charger and Dual 200mA Buck Regulator | $150.00 | |
| Buy Now | |||
Applications
- USB-Based Handheld Products
- Portable Li-Ion/Polymer Based Electronic Devices
- Fitness Computers
- Low Power Medical Devices
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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.
