LTC4002 - Standalone Li-Ion Switch Mode Battery Charger
Features
- Wide Input Supply Range:
4.7V to 22V – 4.2 Version
8.9V to 22V – 8.4 Version - High Efficiency Current Mode PWM Controller with 500kHz Switching Frequency
- ±1% Charge Voltage Accuracy
- End-of-Charge Current Detection Output
- 3 Hour Charge Termination Timer
- Constant Switching Frequency for Minimum Noise
- ±5% Charge Current Accuracy
- Low 10µA Reverse Battery Drain Current
- Automatic Battery Recharge
- Automatic Shutdown When Input Supply is Removed
- Automatic Trickle Charging of Low Voltage Batteries
- Battery Temperature Sensing and Charge Qualification
- Stable with Ceramic Output Capacitor
- 8-Lead SO and 10-Lead DFN Packages
Typical Application
Description
The LTC4002 is a complete battery charger controller for one (4.2V) or two (8.4V) cell lithium-ion batteries. With a 500kHz switching frequency, the LTC4002 provides a small, simple and efficient solution to fast charge Li-Ion batteries from a wide range of supply voltages. An external sense resistor sets the charge current with ±5% accuracy. An internal resistor divider and precision reference set the final float voltage to 4.2V per cell with ±1% accuracy.
When the input supply is removed, the LTC4002 automatically enters a low current sleep mode, dropping the battery drain current to 10µA. An internal comparator detects the near end-of-charge condition while an internal timer sets the total charge time and terminates the charge cycle. After the charge cycle ends, if the battery voltage drops below 4.05V per cell, a new charge cycle will automatically begin.
The LTC4002 is available in the 8-lead SO and 10-lead DFN packages.
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 |
|---|---|---|---|---|---|
| LTC4002EDD-4.2#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC4002EDD-4.2#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC4002EDD-8.4#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC4002EDD-8.4#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC4002ES8-4.2#PBF | SO-8 | S8 | E | 05-08-1610 (S8) | Yes |
| LTC4002ES8-4.2#TRPBF | SO-8 | S8 | E | 05-08-1610 (S8) | Yes |
| LTC4002ES8-8.4#PBF | SO-8 | S8 | E | 05-08-1610 (S8) | Yes |
| LTC4002ES8-8.4#TRPBF | SO-8 | S8 | E | 05-08-1610 (S8) | 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 | |
|---|---|---|---|---|---|---|
| LTC4002EDD-4.2#PBF | 3x3 DFN-10 | E | $2.25 | $1.90 | Yes | |
| LTC4002EDD-4.2#TRPBF | 3x3 DFN-10 | E | $2.00 | Yes | ||
| LTC4002EDD-8.4#PBF | 3x3 DFN-10 | E | $2.25 | $1.90 | Yes | |
| LTC4002EDD-8.4#TRPBF | 3x3 DFN-10 | E | $2.00 | Yes | ||
| LTC4002ES8-4.2#PBF | SO-8 | E | $2.15 | $1.80 | Yes | |
| LTC4002ES8-4.2#TRPBF | SO-8 | E | $1.86 | Yes | ||
| LTC4002ES8-8.4#PBF | SO-8 | E | $2.15 | $1.80 | Yes | |
| LTC4002ES8-8.4#TRPBF | SO-8 | E | $1.86 | 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 |
|---|---|---|---|
| DC551A-A | LTC4002EDD-4.2 | Li-Ion Battery Charger with Charge Termination, +VIN = 5.2V to 24V, 3A Charge Current | $125.00 | |
| DC551A-B | LTC4002EDD-8.4 | Li-Ion Battery Charger with Charge Termination, +VIN = 9.3V to 24V, 3A Charge Current | $75.00 | |
| Buy Now | |||
Applications
- Portable Computers
- Charging Docks
- Handheld Instruments
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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:
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- 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.
