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LTC4006 - 4A, High Efficiency, Standalone Li-Ion Battery Charger

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.

Features 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 Typical Application

Applications Notebook Computers Portable Instruments Battery-Backup Systems Standalone Li-Ion Chargers Packaging

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