LTC4006 Datasheet | Linear Technology

4A, High Efficiency, Standalone Li-Ion Battery Charger Features DESCRIPTIO - plete 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 U APPLICATIO S - Notebook puters - Portable Instruments - Battery-Backup Systems - Standalone Li-Ion Chargers The LTC®4006 is a plete constant-current/constantvoltage charger controller for 2-, 3- or 4-cell lithium batteries in a small package using few external ponents. 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...