LTC4007EGN#PBF

LTC4007 is a complete constant-current/constant-voltage charger controller for 3- or 4-cell lithium-ion batteries. The PWM controller uses a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when using ceramic capacitors. Charging current is programmable to ±4% accuracy using a programming resistor. Charging current can also be monitored as a voltage across the programming resistor. The output float voltage is pin programmed for cell count (3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer, programmed by an external resistor, sets the charge termination time. Charging is automatically restarted when cell voltage falls below 3.9V/cell. It includes a thermistor input, which suspends charging if an unsafe temperature condition is detected. It is widely 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
• ±0.8% charging voltage accuracy
• AC adapter current limiting maximizes charge rate
• Thermistor input for temperature qualified charging
• Wide input voltage range is 6V to 28V
• 0.5V dropout voltage, maximum duty cycle is 99% typ
• Operating junction temperature is -40°C to 85°C
• Package style is 24-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