LTC4065-4.4 - Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN
Features
- Complete Linear Charger in 2mm × 2mm DFN Package
- C/10 Charge Current Detection Output
- Timer Termination
- Charge Current Programmable Up to 750mA with 5% Accuracy
- No External MOSFET, Sense Resistor or Blocking Diode Required
- Preset 4.4V Float Voltage with 0.6% Accuracy
- Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate
- Without Risk of Overheating
- Charge Current Monitor Output for Gas Gauging
- Automatic Recharge
- Charges Single-cell Li-Ion Batteries Directly from USB Port
- 20µA Supply Current in Shutdown Mode
- Soft-Start Limits Inrush Current
- Tiny 6-Lead (2mm × 2mm) DFN Package
Typical Application
Description
The LTC4065-4.4 is a complete constant-current/constant- voltage linear charger for high capacity single-cell lithium-ion batteries with a 4.4V float voltage. Its 2mm × 2mm DFN package and low external component count make the LTC4065-4.4 especially well-suited for portable applications. Furthermore, LTC4065-4.4 is specifically designed to work within USB power specifications.
The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal timer terminates charging according to battery manufacturer specifications.
No external sense resistor or blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates charge current to limit the die temperature during high power operation or high ambient temperature conditions.
When the input supply (wall adapter or USB supply) is removed, the LTC4065-4.4 automatically enters a low current state, dropping battery drain current to less than 1µA. With power applied, LTC4065-4.4 can be put into shutdown mode, reducing the supply current to less than 20µA.
The full-featured LTC4065-4.4 also includes automatic recharge, low-battery charge conditioning (trickle charging) and soft-start (to limit inrush current).
The LTC4065-4.4 is available in a tiny 6-lead, low profile (0.75mm) 2mm × 2mm DFN package.
| Float Voltage (V) | Charge Current Range | Pin 5 Is EN or ACPR? | Trickle Charge? | |
|---|---|---|---|---|
| LTC4065 | 4.2V | 40mA to 750mA | EN | Yes |
| LTC4065A | 4.2V | 40mA to 750mA | ACPR | Yes |
| LTC4065-4.4 | 4.4V | 40mA to 750mA | EN | Yes |
| LTC4065L | 4.2V | 8mA to 250mA | EN | Yes |
| LTC4065LX | 4.2V | 8mA to 250mA | EN | No |
| LTC4065L-4.1 | 4.1V | 8mA to 250mA | EN | Yes |
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 |
|---|---|---|---|---|---|
| LTC4065EDC-4.4#PBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065EDC-4.4#TRMPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065EDC-4.4#TRPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | 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 | |
|---|---|---|---|---|---|---|
| LTC4065EDC-4.4#PBF | 2x2 DFN-6 | E | $1.58 | Yes | ||
| LTC4065EDC-4.4#TRMPBF | 2x2 DFN-6 | E | $1.59 | $1.16 | Yes | |
| LTC4065EDC-4.4#TRPBF | 2x2 DFN-6 | E | $1.59 | $1.11 | 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.Click here to view our complete list of demo boards
Applications
- Wireless PDAs
- Cellular Phones
- Portable Electronics
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Design Tools
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LTC4065
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.
