Features and Benefits
- Complete Charger Controller for 2-, 3- or 4-Cell Lithium-Ion Batteries
- High Conversion Efficiency: Up to 96%
- Output Currents Exceeding 4A
- ±0.8% Accurate Preset Voltages: 8.4V, 12.6V, 16.8V
- Built-In Charge Termination with Automatic Restart
- AC Adapter Current Limiting Maximizes Charge Rate*
- Automatic Conditioning of Deeply Discharged Batteries
- Thermistor Input for Temperature Qualified Charging
- Wide Input Voltage Range: 6V to 28V
- 0.5V Dropout Voltage; Maximum Duty Cycle: 98%
- Programmable Charge Current: ±4% Accuracy
- Indicator Outputs for Charging, C/10 Current Detection and AC Adapter Present
- Charging Current Monitor Output
- 16-Pin Narrow SSOP Package
The LTC4006 is a complete constant-current/constant voltage charger controller for 2-, 3- or 4-cell lithium batteries in a small package using few external components. The PWM controller is a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when using ceramic capacitors.
The LTC4006 is available in 8.4V, 12.6V and 16.8V versions with ±0.8% voltage accuracy. Charging current is programmable with a single sense resistor to ±4% typical accuracy. Charging current can be monitored as a representative voltage at the IMON pin. A timer, programmed by an external resistor, sets the total charge time or is reset to 25% of total charge time after C/10 charging current is reached. Charging automatically resumes when the cell voltage falls below 3.9V/cell.
Fully discharged cells are automatically trickle charged at 10% of the programmed current until the cell voltage exceeds 2.5V/cell. Charging terminates if the low-battery condition persists for more than 25% of the total charge time.
The LTC4006 includes a thermistor sensor input that suspends charging if an unsafe temperature condition is detected and automatically resumes charging when the battery temperature returns to within safe limits.
- Notebook Computers
- Portable Instruments
- Battery-Backup Systems
- Standalone Li-Ion Chargers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 495 is a single battery standalone battery charge controller with built in charge termination featuring the LTC4006. The input voltage is 9 to 20V. The charger output voltage is fixed for a 2-cell 8.4V Li-ion battery. The maximum charge current is 2A. The board will automatically charge a battery to termination as soon as input power is applied with a battery connected prior to power up. Status LEDs are provided for CHG, ACP, and C/10. An on-board NTC thermistor is provided. Although this charger is not a smart battery charger, a popular smart battery connector is provided that can be used for data logging with the OPTIONAL DC1223A-B Demo board and software. To be clear, you do NOT need a smart battery to use this board. The optional DC1223A-B SMBUS-to-USB port adapter and associated software to monitor a smart battery are for demonstration purposes only. Contact your LT representative for ordering a DC1223A-B.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.