LT1769 - Constant-Current/Constant-Voltage 2A Battery Charger with Input Current Limiting
Features
- Simple Solution to Charge NiCd, NiMH and Lithium Rechargeable Batteries—Charging Current Programmed by Resistors or DAC
- Adapter Current Limit Allows Maximum Possible Charging Current During System Use*
- Precision 0.5% Accuracy for Voltage Mode Charging
- High Efficiency Current Mode PWM with 3A Internal Switch
- 5% Charge Current Accuracy
- Adjustable Undervoltage Lockout
- Automatic Shutdown When AC Adapter is Removed
- Low Reverse Battery Drain Current: 3µA
- Current Sensing Can Be at Either Terminal of the Battery
- Charging Current Soft Start
- Shutdown Control
- Available in 20-Lead Exposed Pad TSSOP and 28-Lead Narrow SSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LT®1769 current mode PWM battery charger is a simple, efficient solution to fast charge modern rechargeable batteries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) that require constant-current and/or constant-voltage charging. The internal switch is capable of delivering 2A** DC current (3A peak current). Charge current can be programmed by resistors or a DAC to within 5%. With 0.5% reference voltage accuracy, the LT1769 meets the critical constant-voltage charging requirement for Li-Ion cells.A third control loop is provided to regulate the current drawn from the input AC adapter. This allows simultaneous operation of the equipment and battery charging without overloading the adapter. Charge current is reduced to keep the adapter current below specified levels.
The LT1769 can charge batteries ranging from 1V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturating switch running at 200kHz gives high charging efficiency and small inductor size. A blocking diode is not required between the chip and the battery because the chip goes into sleep mode and drains only 3µA when the wall adapter is unplugged.
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 |
|---|---|---|---|---|---|
| LT1769CFE#PBF | TSSOP-20 | FE | C | 05-08-1663 (CB) | Yes |
| LT1769CFE#TRPBF | TSSOP-20 | FE | C | 05-08-1663 (CB) | Yes |
| LT1769CGN#PBF | SSOP-28 | GN | C | 05-08-1641 (GN28) | Yes |
| LT1769CGN#TRPBF | SSOP-28 | GN | C | 05-08-1641 (GN28) | Yes |
| LT1769IFE#PBF | TSSOP-20 | FE | I | 05-08-1663 (CB) | Yes |
| LT1769IFE#TRPBF | TSSOP-20 | FE | I | 05-08-1663 (CB) | Yes |
| LT1769IGN#PBF | SSOP-28 | GN | I | 05-08-1641 (GN28) | Yes |
| LT1769IGN#TRPBF | SSOP-28 | GN | I | 05-08-1641 (GN28) | 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 | |
|---|---|---|---|---|---|---|
| LT1769CFE#PBF | TSSOP-20 | C | $6.03 | $5.10 | Yes | |
| LT1769CFE#TRPBF | TSSOP-20 | C | $5.22 | Yes | ||
| LT1769CGN#PBF | SSOP-28 | C | $5.60 | $4.95 | Yes | |
| LT1769CGN#TRPBF | SSOP-28 | C | $5.05 | Yes | ||
| LT1769IFE#PBF | TSSOP-20 | I | $6.63 | $5.60 | Yes | |
| LT1769IFE#TRPBF | TSSOP-20 | I | $5.72 | Yes | ||
| LT1769IGN#PBF | SSOP-28 | I | $6.80 | $6.00 | Yes | |
| LT1769IGN#TRPBF | SSOP-28 | I | $6.10 | 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 |
|---|---|---|---|
| DC243A | LT1769CGN | 2A, Constant Current, Constant Voltage Battery Charger | Contact Factory | |
| DC299A-D | LT1769CGN, LTC1729CMS8 | 2A Li-Ion Battery Charger with Termination Controller, 12V to 25V Input, 8.4Vout @ 2A Max. | Contact Factory | |
| 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 | |
|---|---|---|---|---|---|---|
| LT1769IFE#PBF | TSSOP-20 | I | $6.63 | $5.60 | Yes | |
| LT1769IFE#TRPBF | TSSOP-20 | I | $5.72 | Yes | ||
| LT1769IGN#PBF | SSOP-28 | I | $6.80 | $6.00 | Yes | |
| LT1769IGN#TRPBF | SSOP-28 | I | $6.10 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries
- Switching Regulators with Precision Current Limit
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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.
