LTC4009 - High Efficiency, Multi-Chemistry Battery Charger
Features
- General Purpose Battery Charger Controller
- Efficient 550kHz Synchronous Buck PWM Topology
- ±0.5% Output Float Voltage Accuracy
- Programmable Charge Current: 4% Accuracy
- Programmable AC Adapter Current Limit: 3% Accuracy
- No Audible Noise with Ceramic Capacitors
- Wide Input Voltage Range: 6V to 28V
- Wide Output Voltage Range: 2V to 28V
- Indicator Outputs for AC Adapter Present, Charging, C/10 Current Detection and Input Current Limiting
- Analog Charge Current Monitor
- Micropower Shutdown
- Thermally Enhanced 20-Pin 4mm × 4mm × 0.75mm QFN Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC4009 is a constant-current/constant-voltage battery charger controller. It uses a synchronous quasiconstant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge current is set by the combination of external sense, input and programming resistors. With no built-in termination, the LTC4009 family charges a wide range of batteries under external control.
The LTC4009 features a fully adjustable output voltage, while the LTC4009-1 and LTC4009-2 can be pin-programmed for lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series cells. The LTC4009-1 provides output voltage of 4.1V/cell, and the LTC4009-2 is a 4.2V/cell version.
The device includes AC adapter input current limiting which maximizes the charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates when the battery charge current is being reduced as a result of AC adapter current limiting.
The CHRG status pin is active during all charging modes, including special indication for low charge current.
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 |
|---|---|---|---|---|---|
| LTC4009CUF-1#PBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4009CUF-1#TRPBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4009CUF-2#PBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4009CUF-2#TRPBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4009CUF#PBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4009CUF#TRPBF | 4x4 QFN-20 | UF | C | 05-08-1710 | Yes |
| LTC4009IUF-1#PBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LTC4009IUF-1#TRPBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LTC4009IUF-2#PBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LTC4009IUF-2#TRPBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LTC4009IUF#PBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LTC4009IUF#TRPBF | 4x4 QFN-20 | UF | I | 05-08-1710 | 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 | |
|---|---|---|---|---|---|---|
| LTC4009CUF-1#PBF | 4x4 QFN-20 | C | $4.36 | $3.05 | Yes | |
| LTC4009CUF-1#TRPBF | 4x4 QFN-20 | C | $3.11 | Yes | ||
| LTC4009CUF-2#PBF | 4x4 QFN-20 | C | $4.36 | $3.05 | Yes | |
| LTC4009CUF-2#TRPBF | 4x4 QFN-20 | C | $3.11 | Yes | ||
| LTC4009CUF#PBF | 4x4 QFN-20 | C | $4.22 | $2.95 | Yes | |
| LTC4009CUF#TRPBF | 4x4 QFN-20 | C | $3.01 | Yes | ||
| LTC4009IUF-1#PBF | 4x4 QFN-20 | I | $5.00 | $3.50 | Yes | |
| LTC4009IUF-1#TRPBF | 4x4 QFN-20 | I | $3.56 | Yes | ||
| LTC4009IUF-2#PBF | 4x4 QFN-20 | I | $5.00 | $3.50 | Yes | |
| LTC4009IUF-2#TRPBF | 4x4 QFN-20 | I | $3.56 | Yes | ||
| LTC4009IUF#PBF | 4x4 QFN-20 | I | $4.86 | $3.40 | Yes | |
| LTC4009IUF#TRPBF | 4x4 QFN-20 | I | $3.46 | 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 |
|---|---|---|---|
| DC1104A | LTC4009CUF-1/-2 Demo Board | Multi-Chemistry, 2A Sync Buck Battery Charger, 1.35V ≤ VIN ≤ 20V | $125.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1223A-B | USB to SM-Bus/SPI Interface with Monitor | $400.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4009IUF-1#PBF | 4x4 QFN-20 | I | $5.00 | $3.50 | Yes | |
| LTC4009IUF-1#TRPBF | 4x4 QFN-20 | I | $3.56 | Yes | ||
| LTC4009IUF-2#PBF | 4x4 QFN-20 | I | $5.00 | $3.50 | Yes | |
| LTC4009IUF-2#TRPBF | 4x4 QFN-20 | I | $3.56 | Yes | ||
| LTC4009IUF#PBF | 4x4 QFN-20 | I | $4.86 | $3.40 | Yes | |
| LTC4009IUF#TRPBF | 4x4 QFN-20 | I | $3.46 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Notebook Computers
- Portable Instruments
- Battery Backup Systems
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC4009
LTC4009-1
LTC4009-2
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.
