LTC4006EGN-4#PBF

LTC®4006 is a complete constant-current/constant-voltage charger controller for 2-, 3- or 4-cell lithium batteries in a small package using a 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. The 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 the total charge time after the C/10 charging current is reached. Application includes notebook computers, portable instruments, battery backup system, standalone Li-Ion chargers.

• Built-in charge termination with automatic restart
• Automatic conditioning of deeply discharged batteries
• Thermistor input for temperature qualified charging
• Charging current monitor output
• DCIN operating range from 6 to 28V (TA = 25°C. VDCIN = 20V)
• Typical battery leakage current is 20µA (DCIN = 0V, TA = 25°C)
• Termination timer accuracy range from –15 to 15% (RRT = 270K, TA = 25°C)
• Typical source current is -40µA (Measured at ITH, VITH = 1.4V, TA = 25°C)
• 16-lead GN package
• Operating ambient temperature range from -40°C to 85°C

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