LTC4065L/ LTC4065LX/LTC4065L-4.1 - Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN
Features
- Charge Current Programmable up to 250mA with 5% Accuracy
- Complete Linear Charger in 2mm × 2mm DFN Package
- C/10 Charge Current Detection Output
- Timer Termination
- No External MOSFET, Sense Resistor or Blocking Diode Required
- Preset Float Voltage with 0.6% Accuracy:
4.2V for LTC4065L/LTC4065LX
4.1V for LTC4065L-4.1 - 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
- Available Without Trickle Charge (LTC4065LX)
- Tiny 6-Lead (2mm × 2mm) DFN Package
Typical Application
Description
The LTC®4065L is a complete constant-current/constantvoltage linear charger for single-cell lithium-ion batteries. Its small size and ability to accurately regulate low charge currents make the LTC4065L especially well-suited for portable applications using low capacity rechargeable lithium-ion cells. Furthermore, LTC4065L 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.
The LTC4065L-4.1 features a constant-voltage float voltage of 4.1V. This 4.1V version of the standard LTC4065L is intended for back-up or high ambient temperature applications. Under these conditions, a reduced float voltage will tradeoff initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells.
When the input supply (wall adapter or USB supply) is removed, the LTC4065L automatically enters a low current state, dropping battery drain current to less than 1μA. With power applied, LTC4065L can be put into shutdown mode, reducing the supply current to less than 20μA.
The full-featured LTC4065L also includes automatic recharge, low-battery charge conditioning (trickle charging) and soft-start (to limit inrush current).
| 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 |
|---|---|---|---|---|---|
| LTC4065LEDC-4.1#PBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LEDC-4.1#TRMPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LEDC-4.1#TRPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LEDC#PBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LEDC#TRMPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LEDC#TRPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LXEDC#PBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LXEDC#TRMPBF | 2x2 DFN-6 | DC6 | E | 05-08-1703 | Yes |
| LTC4065LXEDC#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 | |
|---|---|---|---|---|---|---|
| LTC4065LEDC-4.1#PBF | 2x2 DFN-6 | E | $1.65 | Yes | ||
| LTC4065LEDC-4.1#TRMPBF | 2x2 DFN-6 | E | $1.65 | $1.18 | Yes | |
| LTC4065LEDC-4.1#TRPBF | 2x2 DFN-6 | E | $1.65 | $1.16 | Yes | |
| LTC4065LEDC#PBF | 2x2 DFN-6 | E | $1.65 | Yes | ||
| LTC4065LEDC#TRMPBF | 2x2 DFN-6 | E | $1.65 | $1.18 | Yes | |
| LTC4065LEDC#TRPBF | 2x2 DFN-6 | E | $1.65 | $1.16 | Yes | |
| LTC4065LXEDC#PBF | 2x2 DFN-6 | E | $1.57 | Yes | ||
| LTC4065LXEDC#TRMPBF | 2x2 DFN-6 | E | $1.57 | $1.21 | Yes | |
| LTC4065LXEDC#TRPBF | 2x2 DFN-6 | E | $1.16 | 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
- Charger for Li-Ion Coin Cell Batteries
- Portable MP3 Players, Wireless Headsets
- Bluetooth Applications
- Multifunction Wristwatches
People Who Viewed This Product Also Viewed
- LTC4065/LTC4065A - Standalone 750mA Li-Ion Battery Charger in 2 x 2 DFN
- LTC4054L-4.2 - 150mA Standalone Linear Li-Ion Battery Charger in ThinSOT
- LTC4054-4.2 - Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT
- LTC4071 - Li-Ion/Polymer Shunt Battery Charger System with Low Battery Disconnect
- LT1512 - SEPIC Constant-Current/Constant-Voltage Battery Charger
- LTC4120/LTC4120-4.2 - Wireless Power Receiver and 400mA Buck Battery Charger
- LT3652 - Power Tracking 2A Battery Charger for Solar Power
- LTC1734 - Lithium-Ion Linear Battery Charger in ThinSOT
- LTC4070 - Li-Ion/Polymer Shunt Battery Charger System
- LT1761 - 100mA, Low Noise, LDO Micropower Regulators in TSOT-23
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
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:
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.
