LTC4006EGN-2#PBF

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. 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. It is used in application such as notebook computers, portable instruments, battery-backup systems, standalone Li-Ion chargers etc.

• High conversion efficiency upto 96%
• Output currents exceeding 4A, charging current monitor output
• 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 is 6V to 28V
• Voltage accuracy is 12.6V typical at (TA = 25°C, VDCIN = 20V, VBAT = 12V)
• Operating junction temperature is -40°C to 125°C
• Package style is 16-lead plastic SSOP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party