LT3650-8.X - High Voltage 2 Amp Monolithic 2-Cell Li-Ion Battery Charger
Features
- Wide Input Voltage Range: 9V to 32V (40V Absolute Maximum)
- Programmable Charge Current: Up to 2A
- User-Selectable Termination: C/10 or Onboard Termination Timer
- Dynamic Charge Rate Programming/Soft-Start Pin
- Programmable Input Current Limit
- 1MHz Fixed Frequency
- Average Current Mode Control
- 0.5% Float Voltage Accuracy
- 5% Charge Current Accuracy
- 2.5% C/10 Detection Accuracy
- NTC Resistor Temperature Monitor
- Auto-Recharge at 97.5% Float Voltage
- Auto-Precondition at <70% Float Voltage
- Bad Battery Detection with Auto-Reset
- Binary Coded Open-Collector Status Pins
- 3mm × 3mm DFN-12 or MSOP-12 Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3650 is a complete monolithic 2-cell Li-Ion/Polymer battery charger that operates over a 9V to 32V input voltage range (11.5V minimum start-up voltage). The LT3650 provides a constant-current/constant-voltage charge characteristic, with maximum charge current externally programmable up to 2A, set using an external current sense resistor. A precondition feature trickle-charges a low voltage battery, and bad-battery detection provides a signal and suspends charging if a battery does not respond to preconditioning.
The LT3650 can be configured to terminate charging when charge current falls to C/10, or one-tenth the programmed maximum current. Once charging is terminated, the LT3650 enters a low current (85μA) standby mode. An auto-restart feature starts a new charging cycle if the battery voltage drops 2.5% from the float voltage, or if a new battery is inserted into a charging system.
The LT3650 contains a user-programmable internal safety timer (typically set to a three hour full cycle time). The IC can be configured to use this internal timer if a time-based termination scheme is desired in which charging can continue below C/10 until a desired time is reached.
The LT3650 is available in a low profile (0.75mm) 3mm × 3mm 12-pin DFN and 12-pin MSOP packages.
| Float Voltage | |
|---|---|
| LT3650-4.1 | 4.1V |
| LT3650-4.2 | 4.2V |
| LT3650-8.2 | 8.2V |
| LT3650-8.4 | 8.4V |
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 |
|---|---|---|---|---|---|
| LT3650EDD-8.2#PBF | 3x3 DFN-12 | DD | E | 05-08-1725 | Yes |
| LT3650EDD-8.2#TRPBF | 3x3 DFN-12 | DD | E | 05-08-1725 | Yes |
| LT3650EDD-8.4#PBF | 3x3 DFN-12 | DD | E | 05-08-1725 | Yes |
| LT3650EDD-8.4#TRPBF | 3x3 DFN-12 | DD | E | 05-08-1725 | Yes |
| LT3650EMSE-8.2#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LT3650EMSE-8.2#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LT3650EMSE-8.4#PBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LT3650EMSE-8.4#TRPBF | MS-12E | MSE | E | 05-08-1666 | Yes |
| LT3650IDD-8.2#PBF | 3x3 DFN-12 | DD | I | 05-08-1725 | Yes |
| LT3650IDD-8.2#TRPBF | 3x3 DFN-12 | DD | I | 05-08-1725 | Yes |
| LT3650IDD-8.4#PBF | 3x3 DFN-12 | DD | I | 05-08-1725 | Yes |
| LT3650IDD-8.4#TRPBF | 3x3 DFN-12 | DD | I | 05-08-1725 | Yes |
| LT3650IMSE-8.2#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LT3650IMSE-8.2#TRPBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LT3650IMSE-8.4#PBF | MS-12E | MSE | I | 05-08-1666 | Yes |
| LT3650IMSE-8.4#TRPBF | MS-12E | MSE | I | 05-08-1666 | 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 | |
|---|---|---|---|---|---|---|
| LT3650EDD-8.2#PBF | 3x3 DFN-12 | E | $4.00 | $2.80 | Yes | |
| LT3650EDD-8.2#TRPBF | 3x3 DFN-12 | E | $2.86 | Yes | ||
| LT3650EDD-8.4#PBF | 3x3 DFN-12 | E | $4.00 | $2.80 | Yes | |
| LT3650EDD-8.4#TRPBF | 3x3 DFN-12 | E | $2.86 | Yes | ||
| LT3650EMSE-8.2#PBF | MS-12E | E | $4.00 | $2.80 | Yes | |
| LT3650EMSE-8.2#TRPBF | MS-12E | E | $2.86 | Yes | ||
| LT3650EMSE-8.4#PBF | MS-12E | E | $4.00 | $2.80 | Yes | |
| LT3650EMSE-8.4#TRPBF | MS-12E | E | $2.86 | Yes | ||
| LT3650IDD-8.2#PBF | 3x3 DFN-12 | I | $4.60 | $3.22 | Yes | |
| LT3650IDD-8.2#TRPBF | 3x3 DFN-12 | I | $3.28 | Yes | ||
| LT3650IDD-8.4#PBF | 3x3 DFN-12 | I | $4.60 | $3.22 | Yes | |
| LT3650IDD-8.4#TRPBF | 3x3 DFN-12 | I | $3.28 | Yes | ||
| LT3650IMSE-8.2#PBF | MS-12E | I | $4.60 | $3.22 | Yes | |
| LT3650IMSE-8.2#TRPBF | MS-12E | I | $3.28 | Yes | ||
| LT3650IMSE-8.4#PBF | MS-12E | I | $4.60 | $3.22 | Yes | |
| LT3650IMSE-8.4#TRPBF | MS-12E | I | $3.28 | 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 |
|---|---|---|---|
| DC1473A-A | LT3650EDD-8.4 Demo board | High Voltage 2 Amp Monolithic 2-Cell Li-Ion Battery Charger | $150.00 | |
| DC1473A-B | LT3650EDD-8.2 Demo board | High Voltage 2 Amp Monolithic Li-Ion Battery Charger | $150.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT3650IDD-8.2#PBF | 3x3 DFN-12 | I | $4.60 | $3.22 | Yes | |
| LT3650IDD-8.2#TRPBF | 3x3 DFN-12 | I | $3.28 | Yes | ||
| LT3650IDD-8.4#PBF | 3x3 DFN-12 | I | $4.60 | $3.22 | Yes | |
| LT3650IDD-8.4#TRPBF | 3x3 DFN-12 | I | $3.28 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Industrial Handheld Instruments
- 12V to 24V Automotive and Heavy Equipment
- Desktop Cradle Chargers
- Notebook Computers
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LT3650-4.1
LT3650-4.2
LT3650-8.2
LT3650-8.4
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.
